Hioki DT4281 User manual

EN
DT4282
DIGITAL MULTIMETER
DT4281
Instruction Manual
Apr. 2015 Revised edition 6
DT4281A981-06 15-04H

i
Contents
Introduction.........................................................................1
Verifying Package Contents ..............................................1
Options (sold separately) ..................................................2
Safety Notes........................................................................5
Usage Notes......................................................................10
1 Overview 15
1.1 Overview and Features.................................15
1.2 Parts Names and Functions.........................16
1.3 Display ...........................................................21
1.4 Alarm Display and Battery Indicator ...........23
2 Preparation for Measurements 25
2.1 Measurement Workflow................................25
2.2 Inserting/Replacing Batteries ...................... 26
2.3 Using Test Leads...........................................28
2.4 Installation in Measurement Location.........31
Using the instrument with the stand.......................... 31
Hanging the instrument with the strap ...................... 31
3 Performing Measurements 33
3.1 Inspection Before Use ..................................33
3.2 Measuring Voltage.........................................38
Measuring AC voltage...............................................38
Measuring DC voltage .............................................. 39
Measuring synthesized voltage of DC and AC .........39
Measuring voltage of DC and AC components.........40
3.3 Measuring Frequencies ................................40
3.4 Decibel Conversion (dBm/dBV) ...................41
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DT4281A981-06

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Contents
3.5 Checking Continuity .....................................42
3.6 Measuring Diode ...........................................43
3.7 Measuring Resistance ..................................44
3.8 Measuring Temperatures..............................45
3.9 Measuring Electrostatic Capacities.............47
3.10 Measuring Conductances
(DT4282) ................48
3.11 Measuring Current ........................................49
Measuring DC/AC..................................................... 49
3.12 Measuring AC Using Clamp-on Probe
(DT4281) .........................................................51
3.13 4-20 mA (0-20 mA) % Conversion ................53
4 Using Instrument Conveniently 55
4.1 Selecting the Measurement Range..............55
Measuring with the auto range .................................55
Measuring with the manual range............................. 55
4.2 Retaining the Measured Value .....................57
Retaining the measured value manually (HOLD) ..... 57
Automatically retaining the measured value
when the value stabilizes (AUTO HOLD)..................57
4.3 When the Measured Value Fluctuates
(SLOW) ...........................................................59
4.4 Removing the Harmonic Components
of the Inverter (FILTER).................................60
4.5 Checking the Maximum/Minimum Value
(MAX/MIN) ......................................................61
4.6 Checking the Peak Value (V • A PEAK) .......62
4.7 Checking the Relative Value/Performing
Zero Adjustment............................................ 63
Checking the relative value (REL) ............................ 63
Performing zero adjustment...................................... 64

iii
Contents
4.8 Using the Memory Function.........................65
Saving the measured value (MEM) ..........................65
Reading the memory data (READ) ........................... 67
Clearing the memory data (CLEAR) ......................... 68
Clearing all memory data.......................................... 68
4.9 Muting the Buzzer .........................................69
4.10 Turning On the Backlight..............................69
4.11 Using the Auto Power Save (APS)...............70
4.12 Using Plus/Minus Judgment Function
for Measurement Value.................................71
4.13 Communicating with PC...............................72
4.14 Setting and Checking the System ...............74
Checking that all indicators are displayed ................74
Checking the software version of the instrument...... 74
Changing the temperature display unit ..................... 75
4.15 Resetting the System....................................76
Table of default settings ............................................ 76
4.16 Power-on Option Table .................................77
5 Specifications 79
5.1 Electrical Characteristics .............................79
5.2 Accuracy Table ..............................................81
5.3 General Specifications .................................95
6 Maintenance and Service 99
6.1 RepairInspectionand Cleaning.................99
6.2 Troubleshooting ..........................................101
6.3 Error Display................................................105
6.4 Replacing Fuses..........................................106
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iv
Contents
Appendix Appx.1
Appx. 1 RMS and Average ............................. Appx.1
Appx. 2 Operation Example...........................Appx.2
Appx. 3 Capacitor Capacity Measurement
Principle.............................................Appx.3
Appx. 4 Dedicated Software
(DMM Communicator) ......................Appx.4

1
Introduction
Introduction
Thank you for purchasing the HIOKI DT4281, DT4282 Digital
Multimeter. To obtain maximum performance from the product,
please read this manual first, and keep it handy for future reference.
Verifying Package Contents
When you receive the instrument, inspect it carefully to ensure that
no damage occurred during shipping.
In particular, check the accessories, panel switches, and
connectors. If damage is evident, or if it fails to operate according
to the specifications, contact your authorized Hioki distributor or
reseller.
Check the package contents as follows.
DT4281 or DT4282
DT4281 DT4282
L9207-10 Test Lead (p. 28)
LR6 Alkaline battery × 4
Instruction Manual
(English)
Instruction manuals may also
be available in other languages.
Please visit our website at
http://www.hioki.com/
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Options (sold separately)
Options (sold separately)
The following options are available for the instrument. Contact your
authorized Hioki distributor or reseller when ordering.
Connecting cables
*1: CATIV 600 V/CATIII 1000 V/CATII 1000 V
*2: CATIV 600 V/CATIII 1000 V
*3: CATIII 1000 V *5: CATIII 300 V/CATII 600 V
*4: CATIII 600 V *6: 33 V AC/70 V DC
*7: CATIII 600 V/CATII 600 V
L4933*6
Contact Pin Set
L4934*5
Small Alligator Clip Set
L4935*2
Alligator Clip Set
9243*3
Grabber Clip
L4936*4
Bus Bar Clip Set
L4937*3
Magnetic Adapter Set
L4932*1
Test Pin Set
L9207-10*1
Test Lead
L4930*2
Connection Cable Set
(Length: 1.2 m)
L4931*2
Extension Cable Set
(Length: 1.5 m, with the
coupling connector)
L4938*7
Test Pin Set
L4939*4
Breaker Pin Set

3
Options (sold separately)
For the clamp current measurement (only compatible with the DT4281)
9010-50, 9018-50, 9132-50*4
Clamp-on Probe
9704 Conversion Adapter
Clamp-on probe Rated
current
Diameter of the measurable
conductor
9010-50, 9018-50 500 A rms 46 mm or less
9132-50 1000 A rms 55 mm or less, 80 × 20 mm bus-bar
Temperature measurement
DT4910 Thermocouples (K) (p. 45)
• Temperature measuring junction: Exposed type (welding)
• Sensor length: Approx. 800 mm
• Operating temperature: -40°C to 260°C (temperature
measuring part), -15°C to 55°C (connector)
C0202 Carrying Case
The instrument, test leads, instruction manual, and others
can be stored in the case.
Z5004 Magnetic Strap (p. 31)
Attach this strap to the instrument and secure it on the
wall surface such as a metal plate for use.
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Options (sold separately)
DT4900-01 Communication Package (USB) (p. 72)
A communication adapter, USB cable, PC software,
and communication specifications are included.
The instrument data can be stored on the PC.

5
Safety Notes
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the instrument in a way not described in
this manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the
following safety notes.
DANGER
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.
WARNING
With regard to the electricity supply, there are risks
of electric shock, heat generation, fire, and arc
discharge due to short circuits. If persons unfamiliar
with electricity measuring instruments are to use
the instrument, another person familiar with such
instruments must supervise operations.
Protective gear
WARNING
To avoid electric shock when measuring live lines,
wear appropriate protective gear, such as insulated
rubber gloves, boots and a safety helmet.
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Safety Notes
Notation
In this manual, the risk seriousness and the hazard levels are
classified as follows.
DANGER Indicates an imminently hazardous situation that will
result in death or serious injury to the operator.
WARNING Indicates a potentially hazardous situation that may
result in death or serious injury to the operator.
CAUTION
Indicates a potentially hazardous situation that may
result in minor or moderate injury to the operator or
damage to the instrument or malfunction.
IMPORTANT
Indicates information related to the operation of the
instrument or maintenance tasks with which the
operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the
instrument is mishandled, this may give rise to a
hazardous situation; the operator may receive an
electric shock, may get burnt or may even be fatally
injured.
Indicates a strong magnetic-field hazard.
The effects of the magnetic force can cause
abnormal operation of heart pacemakers and/or
medical electronics.
Indicates prohibited actions.
Indicates the action which must be performed.
*Additional information is presented below.

7
Safety Notes
Symbols affixed to the instrument
Indicates cautions and hazards. When the symbol is printed on
the instrument, refer to a corresponding topic in the Instruction
Manual.
Indicates that dangerous voltage may be present at this terminal.
Indicates a double-insulated device.
Indicates a fuse.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates DC (Direct Current) or AC (Alternating Current).
Symbols for various standards
Indicates the Waste Electrical and Electronic Equipment
Directive (WEEE Directive) in EU member states.
Indicates that the instrument conforms to regulations set out by
the EC Directive.
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Safety Notes
Screen display
This instrument uses the following screen displays.
1234567890
A BCD E FGH I J K L MNOPQR S T UVWX Y Z
A different display is used in the case below.
Appears when a broken Thermocouple (K) is detected. (p. 45)
Accuracy
We define measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values, with the following meanings:
rdg.
(Reading or displayed value)
The value currently being measured and indicated on the
measuring instrument.
dgt.
(Resolution)
The smallest displayable unit on a digital measuring instrument,
i.e., the input value that causes the digital display to show a “1”
as the least-significant digit.

9
Safety Notes
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement categories.
DANGER
•Using a measuring instrument in an environment
designated with a higher-numbered category than
that for which the instrument is rated could result in
a severe accident, and must be carefully avoided.
•Using a measuring instrument without categories in
an environment designated with the CAT II to CAT
IV category could result in a severe accident, and
must be carefully avoided.
This instrument conforms to the safety requirements for CAT III 1000 V, CAT
IV 600 V measuring instruments.
CAT II: When directly measuring the electrical outlet receptacles of
the primary electrical circuits in equipment connected to an
AC electrical outlet by a power cord (portable tools, household
appliances, etc.)
CAT III: When measuring the primary electrical circuits of heavy equipment
(fixed installations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets
CAT IV: When measuring the circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent
protection device (distribution panel)
T Outlet
CAT II
Internal wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed installation
See: “2.3 Using Test Leads” (p. 28)
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Usage Notes
Usage Notes
Follow these precautions to ensure safe operation and to obtain the
full benefits of the various functions.
DANGER
If the test lead or the instrument is damaged, there is
a risk of electric shock. Before using the instrument,
perform the following inspection.
•Before using the instrument, check that the coating of
the test leads are neither ripped nor torn and that no
metal parts are exposed. Using the instrument under
such conditions could result in electrocution. Replace
the test leads with those specified by our company.
•Before using the instrument for the first time, verify
that it operates normally to ensure that no damage
occurred during storage or shipping. If you find any
damage, contact your authorized Hioki distributor or
reseller.
Installation
Installing the instrument in inappropriate locations may cause a
malfunction of instrument or may give rise to an accident. Avoid the
following locations. For details on the operating temperature and
humidity, see the specifications. (p. 95)
CAUTION
• Exposed to direct sunlight or high temperature
• Exposed to corrosive or combustible gases
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to a strong electromagnetic field or electrostatic
charge
• Exposed to high quantities of dust particles
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
• Susceptible to vibration

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Usage Notes
Handling the cables
WARNING
To prevent electric shock, when measuring the
voltage of a power line use a test lead that satisfies
the following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be
measured
All of the optional test leads for this device conform
to the safety standard EN61010. Use a test lead in
accordance with its defined measurement category
and rated voltage.
CAUTION
• Avoid stepping on or pinching the cable, which could
damage the cable insulation.
• To avoid damaging the cables, do not bend or pull the
leads and the probe bases.
The ends of the test leads are sharp. Be careful to avoid
injury.
For the test leads supplied with the instrument or the options to be connected
to the instrument, see the following information.
Accessories and options Reference
Test lead “2.3 Using Test Leads” (p. 28)
Thermocouples (K) “3.8 Measuring Temperatures” (p. 45)
Clamp-on probe See the Instruction Manual which
accompanies the optional clamp.
USB cable “4.13 Communicating with PC” (p. 72)
Magnetic strap “2.4 Installation in Measurement
Location” (p. 31)
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Usage Notes
Precautions during measurement
WARNING
If the instrument is used in locations where the rating
indicated on the instrument or probes is exceeded,
the instrument may be damaged resulting in personal
injury. Do not use the instrument in such locations.
See “Measurement categories” (p. 9).
•With regard to the 10 A range, the maximum input
current is 10 A DC/10 Arms AC. Supplying a current
in excess of the maximum input may damage the
instrument and result in personal injury. Do not
supply current in excess of the specified limit. (Only
the DT4282)
Observe the following to avoid electric shock and/or
short circuits.
•Hazardous voltage may be generated in a free
measurement terminal. Do not touch the free
terminal.
•Use only test leads and optional equipment
specified by our company.
•Do not allow the metal part of the test lead to touch
any exposed metal, or to short between 2 lines.
Never touch the metal end.
•When connecting the clip-type test lead to the
active terminal, do not allow the lead to touch any
exposed metal, or to short between 2 lines.
•When the clamp-on probe is opened, do not allow
the metal part of the clamp to touch any exposed
metal, or to short between 2 lines, and do not
use over bare conductors. (For the clamp current
measurement, only the DT4281)

13
Usage Notes
CAUTION
• Do not input voltage or supply current exceeding the
specified measurement range. Doing so may damage
the instrument.
• During the continuity check, diode test, or measurement
of resistance, conductance, or electrostatic capacity,
measurement signals are generated in the terminals of
the instrument. Depending on the target for measurement,
the measurement signal may cause damage.
Seeing “Measurement current” and “Open circuit
voltage” in the accuracy table (p. 81), check, in advance,
that there are no adverse effects of the measurement
current and the open circuit voltage.
Precautions during shipment
Observe the following during shipment. Hioki cannot be responsible
for damage that occurs during shipment.
CAUTION
• During shipment of the instrument, handle it carefully so
that it is not damaged due to a vibration or shock.
• To avoid damage to the instrument, remove the
accessories and optional equipment from the instrument
before shipment.
If the instrument is not to be used for an extended
period of time
IMPORTANT
To avoid corrosion and/or damage to the instrument due to battery
leakage, remove the batteries from the instrument if it is to be
kept in storage for an extended period.
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1Overview
1.1 Overview and Features
This measuring instrument is a multi-function, high-precision digital
multimeter which ensures both safety and durability.
Useful functions during
measurement
• Noise reduction (FILTER)
• Display stability (SLOW)
• Display hold (HOLD)
• Maximum/Minimum value
display
Main features
• Speedy display of the RMS measured value
• Environmental performance (can be used
anywhere) (Operation temperature: -15 to 55°C)
• High noise-proof performance
• Filter function effective for the inverter measurement
• Solid body which can be used for an extended
period of time (drop-proof)
• High accuracy (DCV: 0.025%), wide band (20 Hz to 100 kHz) measurement
• Speedy measurement via a fast response (0 V 100 V response 1 second*)
* Until the value falls within the accuracy specification range.
Data transmission
to PC,
control
The optional
DT4900-01
Communication
Package is required.
The measurement test
leads and the end pins can
be selected depending on
the purpose of use.
For the DC power
supply maintenance
The peak measurement
function is used to
capture the ripple voltage
superimposed on the DC
signal.
100V85.9V114.1V
PEAK min
PEAK max
Memorizing
measured values
For control of the UPS
battery cell voltage, etc.,
the measurement value can
be saved to the embedded
memory (up to 400 data).
The measurement value can
also be read.
If there is an excessive input,
a hazard is indicated by the
red display.
Large, easily-viewable display
Backlighting for use in dark
environments
Problem finding a
suitable installation
location?
The strap with magnet allows the
device to be hung conveniently.
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16
Parts Names and Functions
1.2 Parts Names and Functions
Front
Some indications are different between the DT4281 and DT4282.
Operation
keys (p. 17)
Measurement
terminals
(p. 19)
Display
(p. 21)
DT4281 DT4282
Rotary
switch
(p. 18)