Hioki 3481-20 User manual

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

Basic Specifications

Electrical Specifications

Although the following phenomena, which are unavoidable in the detection

principle, can be observed, the instrument has no malfunction.

VOLTAGE DETECTOR Object to be Measured

The white LED still lighting up, and

the red LED flashes and the buzzer

sounds.

Live.

Only the white LED lights up. Not live or below the Operating-voltage

range.

Performance Check

Detection

The

white LED is still lighting up.

OK NG

2. Turn the switch ON.

Turn on the switch. In the state that the white LED is

lighting up, apply the detecting element to the object to

be detected. If there are several wires, conduct a volt-

age check of each wire separately. (Check some points

for bundle of wires.)

The object to be measured cannot be de-

tected, or it is not live.

See"Examples of inapplicable circuits" in

the"Measurement Principal" section.

Check voltage using a voltmeter when in

doubt.

The white LED lights up. The white LED does not light up or is dim.

The batteries are running

The red LED

flashes

and the buzzer sounds.

The red LED does not flash

or the buzzer does not sound.

The

instrument

is operating

The instrument may be malfunctioning.

properly. It can be used.

Do not use it.

The red LED flash and the buzzer sounds.

The object is live.

Switch

1. Inspect the instrument carefully to ensure that no damage.

There is no damage. The instrument is damaged.

Be sure to check the following before and after use to avoid

Contact your dealer or Hioki representative.

OK NG

The red LED and buzzer

sound are getting off.

low. Replace the batteries.

The batteries are running

low. Replace the batteries.

3. Grip the instrument firmly and apply the

detecting element to a known power supply

(e.g., AC outlet) in order to check the

performance.

electrical shock.

The sensitivity will vary according to wire types or operating

environments. Please adjust the sensitivity appropriately

depending on your operating environment.

Replacing the batteries

• Do not mix old and new batteries, or different types of bat-

teries. Also, be careful to observe battery polarity during

installation. Otherwise, poor performance or damage from

battery leakage could result.

• Battery may explode if mistreated. Do not short-circuit,

recharge, disassemble or dispose of in fire.

• Handle and dispose of batteries in accordance with local

regulations.

• Keep batteries away from children to prevent accidental

swallowing.

• Use LR44 button alkaline battery.

• After use, always turn OFF the power to prevent battery drain.

Adjusting sensitivity

1. Slide the battery cover to the position where the sensitivity adjustment

trimmer appears.

2.Turn the trimmer with a precision screwdriver to adjust the sensitivity,

placing the detecting element into contact with an object to be

detected.

Sensitivity

adjustment

trimmer

Clockwise:

Increase the sensitivity to detect a relatively low voltage.

Counterclockwise:

Decrease the sensitivity to detect a relatively high voltage

Turn the switch off.

Replace the old batteries with new

ones. Confirm correct polarity when

installing the new batteries.

Unlock the battery cover by pressing in

the opening with the tip of a pen,

screwdriver or other thin apparatus and

slide the cover towards the end of the

Slide the battery cover back

into locked position.

voltage detector.

Replacing the batteries

①

②

Name of Parts

Specifications

Function Detection

Operating Voltage Range

40V to 600 V AC

(When brought into contact with a 2-mm2insu-

lated cable equivalent to 600 V polyvinyl chlo-

ride insulated wire )

Maximum sensitivity variable range

40 V to 80 V AC

Operating frequency 50 Hz/60 Hz

Pilot light The red LED

flashes

and the buzzer sounds

when the wire is live.

Additional Functions

Light

Battery check (The white LED is dim or out

when the batteries are low.)

Power supply Three LR44 button alkaline batteries.

Dimensions Approx. 20W×126H × 15D mm (0.79”W ×

4.96”H × 0.59”D)(excluding projections)

Mass Approx. 30 g (1.1 oz.)

(including three LR44 button alkaline batteries)

Operating environment Indoors, altitude up to 2000 m (6562 ft.)

Operating temperature and

humidity

0°C to 40°C (32

°F

to 104

°F

), 80% RH or less.

(no condensation)

Storage temperature and

humidity

-20°C to 60°C (-4

°F

to 140

°F

), 80% RH or less.

(no condensation)

Product warranty period 3 years

Accessories

Instruction manual

Three LR44 button alkaline batteries

(Installed in the instrument, for operation check)

Standards Safety

EMC

EN61010, Pollution degree2,

Measurement category IV 600 V

(anticipated transient overvoltage 8000 V)

EN61326

Maximum rated voltage

to earth 600 V AC

Dielectric strength 8.54 kV rms(between the detecting element and

main body)

Rated supply voltage 1.5 V DC ×3

Operating supply-voltage

range

From 4.95 V to the voltage at which the white LED

goes out (central value: 3.6 V)

Barrier

Detecting

element

Switch

Model 3481-20

Maximum rated power 550 mVA (Max.)

Continuous operating time Approx.5 hours (Power ON Standby state)

Auto power off

The power will be turned off automatically if the

instrument remains idle for 3 minutes after the

power is turned on. To reset, turn the power on

again using the Power ON switch.

If a malfunction is suspected

Phenomenon Cause

Even after the sensitivity adjust-

ment or at a distance of tens of

millimeters from circuits, the in-

strument detects the live circuits

with a voltage of 200 V AC or

higher.

Model 3481-20 is intended mainly to

detect circuits with a voltage of 100 V

AC. The sensitivity variable range is

specified as from 40 V to 80 V AC in

consideration of safety. Thus, the in-

strument may detect circuits with a

voltage of 200 V AC or higher even

after the sensitivity adjustment or at a

distance from the circuit.

The instrument incorrectly de-

tects metalware including steel

desks as live.

Metalware close to AC power may

charge AC potential (induced poten-

tial) to ground due to the influence of

electrostatic capacitance, resulting in

incorrectly detecting.

If the instrument is rapidly moved

closer to or away from non-live cir-

cuits or DC circuits, the instrument

detects live state temporarily.

The non-live circuits or DC circuits

may charge static electricity, tempo-

rarily resulting in incorrectly detecting.

HIOKI 3481D980-01

Basic Specifications

Electrical Specifications

Although the following phenomena, which are unavoidable in the detection

principle, can be observed, the instrument has no malfunction.

VOLTAGE DETECTOR Object to be Measured

The white LED still lighting up, and

the red LED flashes and the buzzer

sounds.

Live.

Only the white LED lights up. Not live or below the Operating-voltage

range.

Performance Check

Detection

The

white LED is still lighting up.

OK NG

2. Turn the switch ON.

Turn on the switch. In the state that the white LED is

lighting up, apply the detecting element to the object to

be detected. If there are several wires, conduct a volt-

age check of each wire separately. (Check some points

for bundle of wires.)

The object to be measured cannot be de-

tected, or it is not live.

See"Examples of inapplicable circuits" in

the"Measurement Principal" section.

Check voltage using a voltmeter when in

doubt.

The white LED lights up. The white LED does not light up or is dim.

The batteries are running

The red LED

flashes

and the buzzer sounds.

The red LED does not flash

or the buzzer does not sound.

The

instrument

is operating

The instrument may be malfunctioning.

properly. It can be used.

Do not use it.

The red LED flash and the buzzer sounds.

The object is live.

Switch

1. Inspect the instrument carefully to ensure that no damage.

There is no damage. The instrument is damaged.

Be sure to check the following before and after use to avoid

Contact your dealer or Hioki representative.

OK NG

The red LED and buzzer

sound are getting off.

low. Replace the batteries.

The batteries are running

low. Replace the batteries.

3. Grip the instrument firmly and apply the

detecting element to a known power supply

(e.g., AC outlet) in order to check the

performance.

electrical shock.

The sensitivity will vary according to wire types or operating

environments. Please adjust the sensitivity appropriately

depending on your operating environment.

Replacing the batteries

• Do not mix old and new batteries, or different types of bat-

teries. Also, be careful to observe battery polarity during

installation. Otherwise, poor performance or damage from

battery leakage could result.

• Battery may explode if mistreated. Do not short-circuit,

recharge, disassemble or dispose of in fire.

• Handle and dispose of batteries in accordance with local

regulations.

• Keep batteries away from children to prevent accidental

swallowing.

• Use LR44 button alkaline battery.

• After use, always turn OFF the power to prevent battery drain.

Adjusting sensitivity

1. Slide the battery cover to the position where the sensitivity adjustment

trimmer appears.

2.Turn the trimmer with a precision screwdriver to adjust the sensitivity,

placing the detecting element into contact with an object to be

detected.

Sensitivity

adjustment

trimmer

Clockwise:

Increase the sensitivity to detect a relatively low voltage.

Counterclockwise:

Decrease the sensitivity to detect a relatively high voltage

Turn the switch off.

Replace the old batteries with new

ones. Confirm correct polarity when

installing the new batteries.

Unlock the battery cover by pressing in

the opening with the tip of a pen,

screwdriver or other thin apparatus and

slide the cover towards the end of the

Slide the battery cover back

into locked position.

voltage detector.

Replacing the batteries

①

②

Name of Parts

Specifications

Function Detection

Operating Voltage Range

40V to 600 V AC

(When brought into contact with a 2-mm2insu-

lated cable equivalent to 600 V polyvinyl chlo-

ride insulated wire )

Maximum sensitivity variable range

40 V to 80 V AC

Operating frequency 50 Hz/60 Hz

Pilot light The red LED

flashes

and the buzzer sounds

when the wire is live.

Additional Functions

Light

Battery check (The white LED is dim or out

when the batteries are low.)

Power supply Three LR44 button alkaline batteries.

Dimensions Approx. 20W×126H × 15D mm (0.79”W ×

4.96”H × 0.59”D)(excluding projections)

Mass Approx. 30 g (1.1 oz.)

(including three LR44 button alkaline batteries)

Operating environment Indoors, altitude up to 2000 m (6562 ft.)

Operating temperature and

humidity

0°C to 40°C (32

°F

to 104

°F

), 80% RH or less.

(no condensation)

Storage temperature and

humidity

-20°C to 60°C (-4

°F

to 140

°F

), 80% RH or less.

(no condensation)

Product warranty period 3 years

Accessories

Instruction manual

Three LR44 button alkaline batteries

(Installed in the instrument, for operation check)

Standards Safety

EMC

EN61010, Pollution degree2,

Measurement category IV 600 V

(anticipated transient overvoltage 8000 V)

EN61326

Maximum rated voltage

to earth 600 V AC

Dielectric strength 8.54 kV rms(between the detecting element and

main body)

Rated supply voltage 1.5 V DC ×3

Operating supply-voltage

range

From 4.95 V to the voltage at which the white LED

goes out (central value: 3.6 V)

Barrier

Detecting

element

Switch

Model 3481-20

Maximum rated power 550 mVA (Max.)

Continuous operating time Approx.5 hours (Power ON Standby state)

Auto power off

The power will be turned off automatically if the

instrument remains idle for 3 minutes after the

power is turned on. To reset, turn the power on

again using the Power ON switch.

If a malfunction is suspected

Phenomenon Cause

Even after the sensitivity adjust-

ment or at a distance of tens of

millimeters from circuits, the in-

strument detects the live circuits

with a voltage of 200 V AC or

higher.

Model 3481-20 is intended mainly to

detect circuits with a voltage of 100 V

AC. The sensitivity variable range is

specified as from 40 V to 80 V AC in

consideration of safety. Thus, the in-

strument may detect circuits with a

voltage of 200 V AC or higher even

after the sensitivity adjustment or at a

distance from the circuit.

The instrument incorrectly de-

tects metalware including steel

desks as live.

Metalware close to AC power may

charge AC potential (induced poten-

tial) to ground due to the influence of

electrostatic capacitance, resulting in

incorrectly detecting.

If the instrument is rapidly moved

closer to or away from non-live cir-

cuits or DC circuits, the instrument

detects live state temporarily.

The non-live circuits or DC circuits

may charge static electricity, tempo-

rarily resulting in incorrectly detecting.

HIOKI 3481D980-01

Basic Specifications

Electrical Specifications

Although the following phenomena, which are unavoidable in the detection

principle, can be observed, the instrument has no malfunction.

VOLTAGE DETECTOR Object to be Measured

The white LED still lighting up, and

the red LED flashes and the buzzer

sounds.

Live.

Only the white LED lights up. Not live or below the Operating-voltage

range.

Performance Check

Detection

The

white LED is still lighting up.

OK NG

2. Turn the switch ON.

Turn on the switch. In the state that the white LED is

lighting up, apply the detecting element to the object to

be detected. If there are several wires, conduct a volt-

age check of each wire separately. (Check some points

for bundle of wires.)

The object to be measured cannot be de-

tected, or it is not live.

See"Examples of inapplicable circuits" in

the"Measurement Principal" section.

Check voltage using a voltmeter when in

doubt.

The white LED lights up. The white LED does not light up or is dim.

The batteries are running

The red LED

flashes

and the buzzer sounds.

The red LED does not flash

or the buzzer does not sound.

The

instrument

is operating

The instrument may be malfunctioning.

properly. It can be used.

Do not use it.

The red LED flash and the buzzer sounds.

The object is live.

Switch

1. Inspect the instrument carefully to ensure that no damage.

There is no damage. The instrument is damaged.

Be sure to check the following before and after use to avoid

Contact your dealer or Hioki representative.

OK NG

The red LED and buzzer

sound are getting off.

low. Replace the batteries.

The batteries are running

low. Replace the batteries.

3. Grip the instrument firmly and apply the

detecting element to a known power supply

(e.g., AC outlet) in order to check the

performance.

electrical shock.

The sensitivity will vary according to wire types or operating

environments. Please adjust the sensitivity appropriately

depending on your operating environment.

Replacing the batteries

• Do not mix old and new batteries, or different types of bat-

teries. Also, be careful to observe battery polarity during

installation. Otherwise, poor performance or damage from

battery leakage could result.

• Battery may explode if mistreated. Do not short-circuit,

recharge, disassemble or dispose of in fire.

• Handle and dispose of batteries in accordance with local

regulations.

• Keep batteries away from children to prevent accidental

swallowing.

• Use LR44 button alkaline battery.

• After use, always turn OFF the power to prevent battery drain.

Adjusting sensitivity

1. Slide the battery cover to the position where the sensitivity adjustment

trimmer appears.

2.Turn the trimmer with a precision screwdriver to adjust the sensitivity,

placing the detecting element into contact with an object to be

detected.

Sensitivity

adjustment

trimmer

Clockwise:

Increase the sensitivity to detect a relatively low voltage.

Counterclockwise:

Decrease the sensitivity to detect a relatively high voltage

Turn the switch off.

Replace the old batteries with new

ones. Confirm correct polarity when

installing the new batteries.

Unlock the battery cover by pressing in

the opening with the tip of a pen,

screwdriver or other thin apparatus and

slide the cover towards the end of the

Slide the battery cover back

into locked position.

voltage detector.

Replacing the batteries

①

②

Name of Parts

Specifications

Function Detection

Operating Voltage Range

40V to 600 V AC

(When brought into contact with a 2-mm2insu-

lated cable equivalent to 600 V polyvinyl chlo-

ride insulated wire )

Maximum sensitivity variable range

40 V to 80 V AC

Operating frequency 50 Hz/60 Hz

Pilot light The red LED

flashes

and the buzzer sounds

when the wire is live.

Additional Functions

Light

Battery check (The white LED is dim or out

when the batteries are low.)

Power supply Three LR44 button alkaline batteries.

Dimensions Approx. 20W×126H × 15D mm (0.79”W ×

4.96”H × 0.59”D)(excluding projections)

Mass Approx. 30 g (1.1 oz.)

(including three LR44 button alkaline batteries)

Operating environment Indoors, altitude up to 2000 m (6562 ft.)

Operating temperature and

humidity

0°C to 40°C (32

°F

to 104

°F

), 80% RH or less.

(no condensation)

Storage temperature and

humidity

-20°C to 60°C (-4

°F

to 140

°F

), 80% RH or less.

(no condensation)

Product warranty period 3 years

Accessories

Instruction manual

Three LR44 button alkaline batteries

(Installed in the instrument, for operation check)

Standards Safety

EMC

EN61010, Pollution degree2,

Measurement category IV 600 V

(anticipated transient overvoltage 8000 V)

EN61326

Maximum rated voltage

to earth 600 V AC

Dielectric strength 8.54 kV rms(between the detecting element and

main body)

Rated supply voltage 1.5 V DC ×3

Operating supply-voltage

range

From 4.95 V to the voltage at which the white LED

goes out (central value: 3.6 V)

Barrier

Detecting

element

Switch

Model 3481-20

Maximum rated power 550 mVA (Max.)

Continuous operating time Approx.5 hours (Power ON Standby state)

Auto power off

The power will be turned off automatically if the

instrument remains idle for 3 minutes after the

power is turned on. To reset, turn the power on

again using the Power ON switch.

If a malfunction is suspected

Phenomenon Cause

Even after the sensitivity adjust-

ment or at a distance of tens of

millimeters from circuits, the in-

strument detects the live circuits

with a voltage of 200 V AC or

higher.

Model 3481-20 is intended mainly to

detect circuits with a voltage of 100 V

AC. The sensitivity variable range is

specified as from 40 V to 80 V AC in

consideration of safety. Thus, the in-

strument may detect circuits with a

voltage of 200 V AC or higher even

after the sensitivity adjustment or at a

distance from the circuit.

The instrument incorrectly de-

tects metalware including steel

desks as live.

Metalware close to AC power may

charge AC potential (induced poten-

tial) to ground due to the influence of

electrostatic capacitance, resulting in

incorrectly detecting.

If the instrument is rapidly moved

closer to or away from non-live cir-

cuits or DC circuits, the instrument

detects live state temporarily.

The non-live circuits or DC circuits

may charge static electricity, tempo-

rarily resulting in incorrectly detecting.

HIOKI 3481D980-01

Basic Specifications

Electrical Specifications

Although the following phenomena, which are unavoidable in the detection

principle, can be observed, the instrument has no malfunction.

VOLTAGE DETECTOR Object to be Measured

The white LED still lighting up, and

the red LED flashes and the buzzer

sounds.

Live.

Only the white LED lights up. Not live or below the Operating-voltage

range.

Performance Check

Detection

The

white LED is still lighting up.

OK NG

2. Turn the switch ON.

Turn on the switch. In the state that the white LED is

lighting up, apply the detecting element to the object to

be detected. If there are several wires, conduct a volt-

age check of each wire separately. (Check some points

for bundle of wires.)

The object to be measured cannot be de-

tected, or it is not live.

See"Examples of inapplicable circuits" in

the"Measurement Principal" section.

Check voltage using a voltmeter when in

doubt.

The white LED lights up. The white LED does not light up or is dim.

The batteries are running

The red LED

flashes

and the buzzer sounds.

The red LED does not flash

or the buzzer does not sound.

The

instrument

is operating

The instrument may be malfunctioning.

properly. It can be used.

Do not use it.

The red LED flash and the buzzer sounds.

The object is live.

Switch

1. Inspect the instrument carefully to ensure that no damage.

There is no damage. The instrument is damaged.

Be sure to check the following before and after use to avoid

Contact your dealer or Hioki representative.

OK NG

The red LED and buzzer

sound are getting off.

low. Replace the batteries.

The batteries are running

low. Replace the batteries.

3. Grip the instrument firmly and apply the

detecting element to a known power supply

(e.g., AC outlet) in order to check the

performance.

electrical shock.

The sensitivity will vary according to wire types or operating

environments. Please adjust the sensitivity appropriately

depending on your operating environment.

Replacing the batteries

• Do not mix old and new batteries, or different types of bat-

teries. Also, be careful to observe battery polarity during

installation. Otherwise, poor performance or damage from

battery leakage could result.

• Battery may explode if mistreated. Do not short-circuit,

recharge, disassemble or dispose of in fire.

• Handle and dispose of batteries in accordance with local

regulations.

• Keep batteries away from children to prevent accidental

swallowing.

• Use LR44 button alkaline battery.

• After use, always turn OFF the power to prevent battery drain.

Adjusting sensitivity

1. Slide the battery cover to the position where the sensitivity adjustment

trimmer appears.

2.Turn the trimmer with a precision screwdriver to adjust the sensitivity,

placing the detecting element into contact with an object to be

detected.

Sensitivity

adjustment

trimmer

Clockwise:

Increase the sensitivity to detect a relatively low voltage.

Counterclockwise:

Decrease the sensitivity to detect a relatively high voltage

Turn the switch off.

Replace the old batteries with new

ones. Confirm correct polarity when

installing the new batteries.

Unlock the battery cover by pressing in

the opening with the tip of a pen,

screwdriver or other thin apparatus and

slide the cover towards the end of the

Slide the battery cover back

into locked position.

voltage detector.

Replacing the batteries

①

②

Name of Parts

Specifications

Function Detection

Operating Voltage Range

40V to 600 V AC

(When brought into contact with a 2-mm2insu-

lated cable equivalent to 600 V polyvinyl chlo-

ride insulated wire )

Maximum sensitivity variable range

40 V to 80 V AC

Operating frequency 50 Hz/60 Hz

Pilot light The red LED

flashes

and the buzzer sounds

when the wire is live.

Additional Functions

Light

Battery check (The white LED is dim or out

when the batteries are low.)

Power supply Three LR44 button alkaline batteries.

Dimensions Approx. 20W×126H × 15D mm (0.79”W ×

4.96”H × 0.59”D)(excluding projections)

Mass Approx. 30 g (1.1 oz.)

(including three LR44 button alkaline batteries)

Operating environment Indoors, altitude up to 2000 m (6562 ft.)

Operating temperature and

humidity

0°C to 40°C (32

°F

to 104

°F

), 80% RH or less.

(no condensation)

Storage temperature and

humidity

-20°C to 60°C (-4

°F

to 140

°F

), 80% RH or less.

(no condensation)

Product warranty period 3 years

Accessories

Instruction manual

Three LR44 button alkaline batteries

(Installed in the instrument, for operation check)

Standards Safety

EMC

EN61010, Pollution degree2,

Measurement category IV 600 V

(anticipated transient overvoltage 8000 V)

EN61326

Maximum rated voltage

to earth 600 V AC

Dielectric strength 8.54 kV rms(between the detecting element and

main body)

Rated supply voltage 1.5 V DC ×3

Operating supply-voltage

range

From 4.95 V to the voltage at which the white LED

goes out (central value: 3.6 V)

Barrier

Detecting

element

Switch

Model 3481-20

Maximum rated power 550 mVA (Max.)

Continuous operating time Approx.5 hours (Power ON Standby state)

Auto power off

The power will be turned off automatically if the

instrument remains idle for 3 minutes after the

power is turned on. To reset, turn the power on

again using the Power ON switch.

If a malfunction is suspected

Phenomenon Cause

Even after the sensitivity adjust-

ment or at a distance of tens of

millimeters from circuits, the in-

strument detects the live circuits

with a voltage of 200 V AC or

higher.

Model 3481-20 is intended mainly to

detect circuits with a voltage of 100 V

AC. The sensitivity variable range is

specified as from 40 V to 80 V AC in

consideration of safety. Thus, the in-

strument may detect circuits with a

voltage of 200 V AC or higher even

after the sensitivity adjustment or at a

distance from the circuit.

The instrument incorrectly de-

tects metalware including steel

desks as live.

Metalware close to AC power may

charge AC potential (induced poten-

tial) to ground due to the influence of

electrostatic capacitance, resulting in

incorrectly detecting.

If the instrument is rapidly moved

closer to or away from non-live cir-

cuits or DC circuits, the instrument

detects live state temporarily.

The non-live circuits or DC circuits

may charge static electricity, tempo-

rarily resulting in incorrectly detecting.

HIOKI 3481D980-01

Basic Specifications

Electrical Specifications

Although the following phenomena, which are unavoidable in the detection

principle, can be observed, the instrument has no malfunction.

VOLTAGE DETECTOR Object to be Measured

The white LED still lighting up, and

the red LED flashes and the buzzer

sounds.

Live.

Only the white LED lights up. Not live or below the Operating-voltage

range.

Performance Check

Detection

The

white LED is still lighting up.

OK NG

2. Turn the switch ON.

Turn on the switch. In the state that the white LED is

lighting up, apply the detecting element to the object to

be detected. If there are several wires, conduct a volt-

age check of each wire separately. (Check some points

for bundle of wires.)

The object to be measured cannot be de-

tected, or it is not live.

See"Examples of inapplicable circuits" in

the"Measurement Principal" section.

Check voltage using a voltmeter when in

doubt.

The white LED lights up. The white LED does not light up or is dim.

The batteries are running

The red LED

flashes

and the buzzer sounds.

The red LED does not flash

or the buzzer does not sound.

The

instrument

is operating

The instrument may be malfunctioning.

properly. It can be used.

Do not use it.

The red LED flash and the buzzer sounds.

The object is live.

Switch

1. Inspect the instrument carefully to ensure that no damage.

There is no damage. The instrument is damaged.

Be sure to check the following before and after use to avoid

Contact your dealer or Hioki representative.

OK NG

The red LED and buzzer

sound are getting off.

low. Replace the batteries.

The batteries are running

low. Replace the batteries.

3. Grip the instrument firmly and apply the

detecting element to a known power supply

(e.g., AC outlet) in order to check the

performance.

electrical shock.

The sensitivity will vary according to wire types or operating

environments. Please adjust the sensitivity appropriately

depending on your operating environment.

Replacing the batteries

• Do not mix old and new batteries, or different types of bat-

teries. Also, be careful to observe battery polarity during

installation. Otherwise, poor performance or damage from

battery leakage could result.

• Battery may explode if mistreated. Do not short-circuit,

recharge, disassemble or dispose of in fire.

• Handle and dispose of batteries in accordance with local

regulations.

• Keep batteries away from children to prevent accidental

swallowing.

• Use LR44 button alkaline battery.

• After use, always turn OFF the power to prevent battery drain.

Adjusting sensitivity

1. Slide the battery cover to the position where the sensitivity adjustment

trimmer appears.

2.Turn the trimmer with a precision screwdriver to adjust the sensitivity,

placing the detecting element into contact with an object to be

detected.

Sensitivity

adjustment

trimmer

Clockwise:

Increase the sensitivity to detect a relatively low voltage.

Counterclockwise:

Decrease the sensitivity to detect a relatively high voltage

Turn the switch off.

Replace the old batteries with new

ones. Confirm correct polarity when

installing the new batteries.

Unlock the battery cover by pressing in

the opening with the tip of a pen,

screwdriver or other thin apparatus and

slide the cover towards the end of the

Slide the battery cover back

into locked position.

voltage detector.

Replacing the batteries

①

②

Name of Parts

Specifications

Function Detection

Operating Voltage Range

40V to 600 V AC

(When brought into contact with a 2-mm2insu-

lated cable equivalent to 600 V polyvinyl chlo-

ride insulated wire )

Maximum sensitivity variable range

40 V to 80 V AC

Operating frequency 50 Hz/60 Hz

Pilot light The red LED

flashes

and the buzzer sounds

when the wire is live.

Additional Functions

Light

Battery check (The white LED is dim or out

when the batteries are low.)

Power supply Three LR44 button alkaline batteries.

Dimensions Approx. 20W×126H × 15D mm (0.79”W ×

4.96”H × 0.59”D)(excluding projections)

Mass Approx. 30 g (1.1 oz.)

(including three LR44 button alkaline batteries)

Operating environment Indoors, altitude up to 2000 m (6562 ft.)

Operating temperature and

humidity

0°C to 40°C (32

°F

to 104

°F

), 80% RH or less.

(no condensation)

Storage temperature and

humidity

-20°C to 60°C (-4

°F

to 140

°F

), 80% RH or less.

(no condensation)

Product warranty period 3 years

Accessories

Instruction manual

Three LR44 button alkaline batteries

(Installed in the instrument, for operation check)

Standards Safety

EMC

EN61010, Pollution degree2,

Measurement category IV 600 V

(anticipated transient overvoltage 8000 V)

EN61326

Maximum rated voltage

to earth 600 V AC

Dielectric strength 8.54 kV rms(between the detecting element and

main body)

Rated supply voltage 1.5 V DC ×3

Operating supply-voltage

range

From 4.95 V to the voltage at which the white LED

goes out (central value: 3.6 V)

Barrier

Detecting

element

Switch

Model 3481-20

Maximum rated power 550 mVA (Max.)

Continuous operating time Approx.5 hours (Power ON Standby state)

Auto power off

The power will be turned off automatically if the

instrument remains idle for 3 minutes after the

power is turned on. To reset, turn the power on

again using the Power ON switch.

If a malfunction is suspected

Phenomenon Cause

Even after the sensitivity adjust-

ment or at a distance of tens of

millimeters from circuits, the in-

strument detects the live circuits

with a voltage of 200 V AC or

higher.

Model 3481-20 is intended mainly to

detect circuits with a voltage of 100 V

AC. The sensitivity variable range is

specified as from 40 V to 80 V AC in

consideration of safety. Thus, the in-

strument may detect circuits with a

voltage of 200 V AC or higher even

after the sensitivity adjustment or at a

distance from the circuit.

The instrument incorrectly de-

tects metalware including steel

desks as live.

Metalware close to AC power may

charge AC potential (induced poten-

tial) to ground due to the influence of

electrostatic capacitance, resulting in

incorrectly detecting.

If the instrument is rapidly moved

closer to or away from non-live cir-

cuits or DC circuits, the instrument

detects live state temporarily.

The non-live circuits or DC circuits

may charge static electricity, tempo-

rarily resulting in incorrectly detecting.

HIOKI 3481D980-01

Introduction

Thank you for purchasing the HIOKI “Model 3481-20 VOLTAGE DETEC-

TOR.” To obtain maximum performance from the instrument, please read

this manual first, and keep it handy for future reference.

This non-contact type of voltage detector unit enables the hot-line state of

AC voltage to be checked through the wire or cable covering

When you receive the instrument, inspect it carefully to ensure that no dam-

age occurred during shipping. If damage is evident, or if it fails to operate ac-

cording to the specifications, contact your dealer or Hioki representative.

• To clean the instrument, wipe it gently with a soft cloth moistened

with water or mild detergent. Never use solvents such as benzene,

alcohol, acetone, ether, ketones, thinners or gasoline, as they can

deform and discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batter-

ies are not discharged, before contacting your dealer or Hioki repre-

sentative.

This manual contains information and warnings essential for safe operation

of the instrument and for maintaining it in safe operating condition. Before

using it, be sure to carefully read the following safety precautions.

Safety Symbol

The following symbols in this manual indicate the relative importance of cau-

tions and warnings.

Symbols for Various Standards

Measurement categories

This instrument complies with CAT IV (600 V) safety requirements.

To ensure safe operation of measurement instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement catego-

ries. These are defined as follows.

CAT II: Primary electrical circuits in equipment connected to an AC

electrical outlet by a power cord (portable tools, household appli-

ances, etc.)

CAT III:Primary electrical circuits of heavy equipment (fixed instal-

lations) connected directly to the distribution panel, and feeders

from the distribution panel to outlets.

CAT IV: The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent protection device

(distribution panel).

Using a measurement

instrument in an environ-

ment designated with a

higher-numbered cate-

gory than that for which

the instrument is rated

could result in a severe

accident, and must be

carefully avoided. Use of a measurement instrument that is not

CAT-rated in CAT II to CAT IV measurement applications could

result in a severe accident, and must be carefully avoided.

Follow these precautions to ensure safe operation and to obtain the

full benefits of the various functions.

The static-induction voltage detection method using static coupling

lets you verify the hot-line state of a wire.

Examples of inapplicable circuits

Performance Check and Voltage Detection

Ideal for 100 V to 120 V installations.

Model 3481-20

Visual and audible

voltage detection indication Auto Power OFF

Sensitivity-adjustable

Sept. 2020 Revised edition 1

3481D980-01 20-09H

3481-20

VOLTAGE

DETECTOR

Instruction Manual

Overview

Initial Inspection

Maintenance and Service

Safety

This instrument is designed to comply with IEC 61010

Safety Standards, and has been thoroughly tested for

safety prior to shipment. However, mishandling during

use could result in injury or death, as well as damage to

the instrument. Be certain that you understand the

instructions and precautions in the manual before use.

We disclaim any responsibility for accidents or injuries

not resulting directly from instrument defects.

In the manual, the symbol indicates particularly important informa-

tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user

should refer to a corresponding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates a double-insulated device.

Indicates AC (Alternating Current).

Indicates DC (Direct Current).

Indicates that incorrect operation presents an extreme hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard

that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury

to the user or damage to the device.

Indicates advisory items related to performance or correct oper-

ation of the instrument.

Indicates the Waste Electrical and Electronic Equipment Directive

(WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the EC

Directive.

Usage Notes

This instrument is measured on a live line. To avoid elec-

tric shock when measuring live lines, wear appropriate

protective gear, such as insulated rubber gloves, boots

and a safety helmet.

• This instrument is designed for use indoors. It can be operated at

temperatures between 0°C and 40°C without degrading safety.

• This instrument is not designed to be entirely water- or dust-proof.

Do not use it in an especially dusty environment, nor where it might

be splashed with liquid. This may cause damage.

• To avoid damage to the instrument, protect it from physical shock

when transporting and handling. Be especially careful to avoid

physical shock from dropping.

• Do not look directly into the penlight nor shine the light at another

person's eye. Doing so may cause damage to the eye.

Measuring Principal

Operating volt-

age range

40 V to 600 V AC

(When placed into contact with a 2 mm2 insulated wire

equivalent to 600 V polyvinyl chloride insulated wires)

Maximum sensitivity adjustable range: 4 V to 80 V

The operating voltage indicates a line-to-earth voltage of

the grounded circuit.

Operating fre-

quency range 50 Hz/ 60 Hz

Measuring principle diagram

C1C2

* Although a detected current will flow to the ground through your body, the

current, which is less than 1 μA, will not adversely affect you.

Inapplicable circuit Example Cause

Grounded wire

• Grounding phase of

single-phase circuit

• Grounding phase of

3-phase circuit

• Grounded neutral wire

• Grounding wire

Voltage is less than

operating voltage range.

Shielded wire shielded wire Shield layer prevents signal

from being detected.

Non-grounded

power system

• Floating circuit

• Transformer used in non-

grounded circuit

Line-to-earth voltage is

unstable.

DC power system • Battery-operated circuit

•PVpanel

Static coupling point cannot

flow DC.

Even if you place the instrument into contact with an inapplicable circuit,

the instrument may detect AC voltage of adjacent cables/wires, being

activated.

Check a voltage using a voltmeter when in doubt.

Detection

The maximum rated voltage between input terminals and

ground is 600 V AC. Attempting to measure voltages

exceeding 600 V with respect to ground could damage

the instrument and result in personal injury.

• The white LED indicates battery consumption but is not a guarantee

of the performance of the instrument. Be sure to check its perfor-

mance using a known power source (e.g., AC outlet) prior to use.

• The instrument voltage detector works using a live AC circuit. It will

not work using an earthed wire or neutral point. If there are several

lines, such as 2-phase wires and 3-phase wires, perform voltage

detection on each line separately.

• The instrument cannot perform voltage detection on a shielded wire.

(See the below figure.)

• Be sure to grip the instrument firmly during measurement. But, do

not touch the portion beyond the barrier. It will not produce any

detection.

• Make sure the detecting element properly contacts the object to be

measured. (See the below figure.)

Detector Body

Object under test

Detecting

plate

Electrode

Ground

Equivalent circuit diagram

Shield

×○

Voltage detection is not

performed properly.

Position the detecting element so that

it is parallel to the object.

HIOKI 3481D980-01

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