Hioki 3275 User manual

INSTRUCTION MANUAL
3275
CLAMP ON PROBE

Contents
Introduction 1
Inspection 1
Notes on Safety 1
Notes on Use 4
Chapter 1 Overview 9
1.1 Product Overview 9
1.2 Features 9
1.3 Names of Parts 10
1.4 Parts of the Sensor 11
Chapter 2 Specifications 13
2.1 Product Specifications 13
2.2 Standards Applying 14
Chapter 3 Measurement Procedure 17
3.1 Notes on Use 17
3.2 Preparations for Measurement 20
3.3 Demagnetizing and Zero Adjustment 21
3.4 Measurement Procedure 22

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WARNING This device 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 device. 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 device defects.
Introduction
Inspection
Notes on Safety
Thank you for purchasing this HIOKI 3275 CLAMP ON PROBE.
To obtain maximum performance from the device, please read this
manual first, and keep it handy for future reference.
When you receive the device, inspect it carefully to ensure that no
damage occurred during shipping. If damage is evident, or if it
fails to operate according to the specifications, contact your dealer
or Hioki representative.
Supplied accessories
Instruction manual 1
Carrying case 1

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The symbol printed on the device indicates that the user
should refer to a corresponding topic in the manual
(marked with the symbol) before using the relevant
function.
In the manual, the symbol indicates particularly
important information that the user should read before
using the device.
Wear appropriate protective insulation (insulating rubber
gloves and boots, helmet and etc.) when connecting and
disconnecting from live electric circuits.
DANGER
Indicates that incorrect operation presents an extreme
hazard that could result in serious injury or death to the
user.
WARNING
Indicates that incorrect operation presents a significant
hazard that could result in serious injury or death to the
user.
CAUTION Indicates that incorrect operation presents a possibility of
injury to the user or damage to the device.
NOTE Indicates advisory items related to performance or correct
operation of the device.
Safety Symbols
This manual contains information and warnings essential for safe
operation of the device and for maintaining it in safe operating
condition. Before using the device, be sure to carefully read the
following safety notes.
The following symbols in this manual indicate the relative
importance of cautions and warnings.

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Measurement categories (Overvoltage categories)
This device conforms to the safety requirements for CAT II
(600V), CAT III (300V) measurement instruments.
To ensure safe operation of measurement devices, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT I to CAT IV, and called measurement
categories. These are defined as follows.
CAT I: Secondary electrical circuits that are connected to a wall
outlet through a transformer or similar instrument.
CAT II: Primary electrical circuits in equipment connected to a
wall outlet via a power cord (portable tools, household
appliances, etc.)
CAT III: Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel,
and feeders between the distribution panel and outlets.
CAT IV: The circuit from the service drop to the service entrance,
then to the power meter and to the primary overcurrent
protection instrument.
Higher-numbered categories correspond to electrical environments
with greater momentary energy. So a measurement device
designed for CAT III environments can endure greater momentary
energythanadevicedesignedforCATII.
Using a measurement device in an environment designated with a
higher-numbered category than that for which the device is rated
could result in a severe accident, and must be carefully avoided.
Never use a CAT I measuring device in CAT II, III, or IV
environments.
The measurement categories comply with the Overvoltage
Categories of the IEC60664 Standards.

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DANGER To avoid short circuits and potentially life-threatening
hazards, follow these precautions.
zNever attach the clamp to a circuit that operates at
more than the maximum rated voltage to earth.
zFor safety's sake, avoid clamping around bare
conductors, while clamping or measuring.
zWhile clamping and measuring, do not touch the
clamp in front of the barrier or the conductor being
measured.
zBe careful to avoid damaging the insulation surface
while taking measurements.
zThis device is made for use with the 3269 or 3272
POWER SUPPLY. It is possible to use a power
supply other than the 3269 or 3272, provided that
the connector and pin assignments match, and that
voltage and other electrical specifications are
satisfied. In the interest of safety, make sure that
the power supply has a protective earthing with
double-insulation construction.
zMake sure that the waveform measuring equipment
connected to this device's output terminal (BNC) is
equipped with a protective earthing with double-
insulation construction.
Notes on Use
Follow these precautions to ensure safe operation and to obtain
the full benefits of the various functions.

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DANGER zIf the waveform measuring instrument being
connected to the output terminal (BNC) on this
device is equipped with any other measurement
terminals, take the following precautions to ensure
that the other instrument does not form a bridge
between the probe and any hazardous live of a
part.
1. Isolate the terminal to which the probe is
connected from other terminals on the measuring
instrument using basic insulation conforming to
the measurement category, working voltage, and
pollution degree requirements of the circuit being
tested.
2. If basic insulation requirements cannot be met
between the terminal to which this device is
connected and other terminals of the measuring
instrument, make sure that the voltage input to
the measurement terminal does not exceed the
Separated Extra-Low Voltage Earthed (SELV-E).
3. Read and observe all warnings and precautions
relating to electrical safety for the measuring
instrument being connected to the probe.
Refer to the following standards regarding the
meanings of underlined terms.
IEC 61010-1
IEC 61010-031
IEC 61010-2-032

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DANGER zBe sure to observe all operating precautions for the
waveform monitoring instrument (oscilloscope or
recorder) and other measurement instruments to
which this device is connected
zWhen using a measurement instrument that does
not provide isolation between its input terminals
and chassis or other input terminals, please pay
attention to the following points.
If a signal is applied to an input terminal other than
that to which this device is connected, do not
connect the ground-side terminal to any non-
ground potential. Otherwise, short-circuit current
will flow through the 3269 or 3272, or this device
from the ground terminal, which could cause an
electrical accident or damage.
WARNING zDo not allow the device to get wet, and do not take
measurements with wet hands. This may cause an
electric shock.

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CAUTION zTo avoid damage to the device, protect it from vibration
or shock during transport and handling, and be
especially careful to avoid dropping.
zDo not store or use the device where it could be
exposed to direct sunlight, high temperature, humidity,
or condensation. Under such conditions, the device
may be damaged and insulation may deteriorate so
that it no longer meets specifications.
zBefore using the device the first time, verify that it
operates normally to ensure that the no damage
occurred during storage or shipping. If you find any
damage, contact your dealer or Hioki representative.
zThis device is not designed to be entirely water- or
dust- proof. To avoid damage, do not use it in a wet or
dusty environment.
zThe sensor head is a precision assembly including a
molded component, a ferrite core, and a Hall effect
element. It may be damaged if subjected to sudden
changes in ambient temperature, or mechanical strain
or shock, and therefore great care should be exercised
in handling it.
zThe matching surfaces of the sensor head are
precision ground, and should be treated with care. If
these surfaces are scratched, performance may be
impaired.
zForeign substances such as dust on the contact
surfaces of the sensor head can cause acoustic
resonance and degrade measurement, so it should be
cleaned by gently wiping with a soft cloth.
zTo avoid damaging the sensor cable and power supply
cable, do not bend or pull the cables.

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CAUTION zWhen the power is on, keep closed, except when
clamping them onto the conductor to be measured.
The facing surface of the core section can be scratched
while it is open.
NOTE zCorrect measurement may be impossible in the presence of strong
magnetic fields, such as near transformers and high-current
conductors, or in the presence of strong electromagnetic fields
such as near radio transmitters.
Service / Maintenance
zTo clean the device, 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.
zIf the device seems to be malfunctioning, contact your dealer or
Hioki representative.
zWhen sending the device for repair, pack carefully to prevent
damage in transit. Include cushioning material so the device
cannot move within the package. Be sure to include details of
the problem.
zHioki cannot be responsible for damage that occurs during
shipment.

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Chapter 1 Overview
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Chapter 1
Overview
1.1 Product Overview
1.2 Features
This device can be directly connected to a BNC input connector
of a waveform measuring instrument such as an oscilloscope or
recorder, and by clamping on a conductor to be measured, allows
the current waveform to be easily captured.
zHighly accurate current detection.
zEasy current measurement.
zBroadband frequency characteristics DC to 2 MHz.
zLarge diameter allows high-current measurements.
zEasy protection function to avoid self-heating during excessive
input.
zUnique HIOKI development of thin film Hall effect element

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Chapter 1 Overview
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Current direction indication "LOCK" indication Terminato
r
Sensor cable
Power supply cable
"UNLOCK" indication
(inside)
Sensor
8
9
1
4
3
2
6
7
5
2
1.3 Names of Parts
External view

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Chapter 1 Overview
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1.4 Parts of the Sensor
1. Clamp
This clamps around the conductor to be measured.
2. Slider
This slider opens the clamp. Always use it to open and close the
clamp.
3. Lever
This lock mechanism keeps the clamp closed.
4. Sensor head
This clamps the conductor being measured, and carries out the
actual current measurement. It is a precision assembly including a
molded component, a ferrite core, and a Hall effect element. It
may be damaged if subjected to sudden changes in ambient
temperature, or mechanical strain or shock, and therefore great
care should be exercised in handling it.
5. Barrier
This structure reduces the likelihood of touching the conductor
while testing, and indicates the limit of safe physical contact.
Avoid touching the clamp in front of the barrier when clamping
or measuring.
6. Demagnetizing switch (DEMAG)
This demagnetizes the core if it has been magnetized by switching
the power on and off, or by an excessive input. Always carry out
demagnetizing before measurement.
The demagnetizing process takes about 3 second. During
demagnetizing, a demagnetizing waveform is output.
7. Zero adjustment dial (ZERO ADJ)
Use the zero adjustment dial to correct for the effect of a voltage
offset or temperature drift on the device.
When beginning measurement, after demagnetizing always carry
out zero adjustment.

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Chapter 1 Overview
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NOTE
8. Output connector
The current waveform of the measured conductor is output at a
constant rate (0.01 V/A).
Connect to the BNC input connector of the waveform measuring
instrument.
zThe output of this device is terminated internally. Use a high-
impedance input to the measuring instrument. With an input
impedance of 50 Ω, accurate measurement is not possible.
zIf using BNC-banana plug adapters or similar to connect to input
terminals other than BNC connectors, make sure the polarity is
correct.
zTurn the collar until it clicks, and check that it is locked
securely.
9. Power plug
Connect this to the 3269 or 3272 POWER SUPPLY receptacle to
supply power to the sensor terminator.

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Chapter 2 Specifications
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Bandwidth DC to 2 MHz (-3 dB)
(Typical characteristics shown in Fig.1)
Rise time 175 ns or less
Maximum
continuous input
range
500 A
Derating according to frequency shown in Fig.2
Maximum peak
current value
Non-continuous 700 A peak;
Output voltage rate 0.01 V/A
Amplitude
accuracy
To 500 A: 1.0% rdg. 5mV
To 700 Apeak: 2.0% rdg.
(DC,and45to66Hz)
Noise Equivalent to 25 mA rms or less (for 20 MHz band
measuring instrument)
Input impedance (Typical characteristics shown in Fig.3)
Temperature
coefficient for
sensitivity
2% or less (Input: 50 Hz 500 A, within a range of 0
to 40 , within a range of 32 to 104 )
Maximum rated
power
7.2 VA (within maximum continuous input range)
Rated supply
voltage
12 V 0.5 V
Chapter 2
Specifications
2.1 Product Specifications
Guaranteed at 23 ±5(73 ±9) after the power has been
on for 30 minutes.

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Chapter 2 Specifications
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Operating
temperature and
humidity range
0to40 (32 to 104 ), 80 % RH or less (no
condensation)
Storage
temperature and
humidity range
-10 to 50 (14 to 122 ), 80 % RH or less (no
condensation)
Location for use Indoor, altitude up to 2000 m (6562 feet)
Period of
guaranteed
accuracy
1 year (Opening/Closing up to 10,000 times)
Effect of external
magnetic fields
Equivalent to a maximum of 800 mA (in a DC or 60
Hz, 400 A/m magnetic field)
Maximum rated
voltage to earth
600 V CAT II, 300 V CAT III (insulated conductor)
Diameter of
measurable
conductors
20 mm dia.
0.79" dia.
Cable lengths Sensor cable Approx. 2 m (78.7")
Power supply cable Approx. 1 m (39.4")
External
dimensions
Sensor Approx. 176W X69H X27D mm
Approx. 6.93"W X2.72"H X1.06"D
Terminator Approx. 27H X55W X18D mm
Approx.1.06"W X2.17"H X0.71"D
Mass Approx. 520 g
Approx. 18.3 oz.
Accessories Instruction manual, Carrying case
Safety EN61010-2-032:2002
Measurement category II, III (anticipated transient
overvoltage 4000 V), Pollution Degree 2
EMC EN61326:1997+A1:1998+A2:2001+A3:2003
2.2 Standards Applying

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Chapter 2 Specifications
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Fig.1 Frequency characteristics (Typical characteristics)
Amplitude[db,0dB=1V]
Frequency [Hz]
Maximuminputcurrent[A]
Inputimpedance[ohm]
Fig.3 Input impedance (Typical characteristics)
Frequency [Hz]
Frequency [Hz]
Fig.2 Derating according to frequency

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Chapter 2 Specifications
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