3273-50
3276A981-05
3276
CLAMP ON PROBE
Instruction Manual
Mar. 2020 Revised edition 5
3276A981-05 20-03H
EN
3276A981-05
Contents
3276A981-05
Introduction i
Inspection
Notes on Safety
Notes on Use
Chapter 1 Overview
1.1 Product Overview 1
1.2 Features
1.3 Names of Parts
1.4 Parts of the Sensor
Chapter 2 Specifications 5
2.1 Product Specifications 5
2.2 Standards Applying
Chapter 3 Measurement Procedure 11
3.1 Notes on Use 11
3.2 Preparations for Measurement
3.3 Demagnetizing and Zero Adjustment
3.4 Measurement Procedure
11
12
16
i
i
iii
1
1
2
2
7
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Introduction
Thank you for purchasing the HIOKI 3273-50,3276
CLAMP ON PROBE. To obtain maximum
performance from the device, please read this
manual first, and keep it handy for future reference.
Inspection
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
3273-50 Soft case 1
3276 Carrying case 1
Notes on Safety
WARNING
This deviceis 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. W e
disclaim any responsibility for accidents or
injuries not resulting directly from device defects.
i
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Introduction
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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 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.
Indicates that only insulated conductors
suited to the voltage of the circuit under
test can be measured.
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Notes on Safety
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The following symbols in this manual indicate the
relative importance of cautions and warnings.
Indicates that incorrect operation
DANGER
presents an extreme hazard that could
result in serious injury or death to the
user.
Indicates that incorrect operation
WARN ING
presents a significant hazard that could
result in serious injury or death to the
user.
Indicates that incorrect operation
CAUTION
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.
Notes on Use
Follow these precautions to ensure safe operation
and to obtain the full benefits of the various
functions.
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Preliminary Check
Before 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.
Notes on Use
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DANGER
・
Do not measure around a bare conductor.
Doing so may result in short-circuit or electric
shock. Take measurements at a location on an
insulated wire where there is sufficient
insulation for the circuit voltage.
・
Refer to the derating characteristics when
measuring current that includes a
highfrequency component and never measure
any current that exceeds the rated current.
・
Use with high frequencies or strong magnetic
fields may cause the device to become
abnormally hot, resulting in fire, equipment
damage, or burns. (See“3 Specifications
”
(p5.))
・
Observe the following to avoid electric shock
and short circuits.
・
Connect the device to the 3269 or the 3272
Power Supply and waveform measurement
instrument (oscilloscope or recorder) first, and
then to the active lines to be measured
・
When the sensor is opened, do not shortcircuit
the conductor being measured or other two
wires with the metal part of the tip.
Be careful to avoid damaging the insulation
surface while taking measurements.
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Notes on Use
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DANGER
・
Before clamping the conductor being
measured,make sure that the insulation on the
conductor isundamaged. Also, take care not to
damage theinsulation when clamping the
conductor. Any damageto the insulation could
cause an electric shock.
This instrument is made for use with the 3269
or 3272 POWER SUPPLY.
To prevent fire or damage of the measurement
target and device as well as burns, exercise
caution concerning the following when
measuring high-frequency currents or currents
that contain high-frequency components:
Eddy current loss may cause heating of the
sensor head.
Dielectric heating may cause heating of cord
insulation and other materials.
This device should only be connected to the
secondary side of a breaker, so the breaker
can prevent an accident if a short circuit
occurs. Connections should never be made to
the primary side of a breaker, because
unrestricted current flow could cause a
serious accident if a short circuit occurs.
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Notes on Use
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DANGER
Be sure to observe all operating precautions for
the waveform monitoring instrument
(oscilloscope or recorder) and other
measurement instruments to which this device
is connected.
When 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 3269,3272 or this
device from the ground terminal, which could
cause an electrical accident or damage.
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Notes on Use
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WARNING
Do not allow the device to get wet, and do not take
measurements with wet hands. This may cause an
electric shock.
・
Do not press the demagnetizing switch (DEMAG)
to perform demagnetization while the conductor
being measured is clamped. Doing so could
damage the circuitry or cause an accident that
might result in injury or death.
・
Ensure that the input does not exceed the
maximum rated current to avoid device damage,
shortcircuiting and electric shock resulting from
heat building.
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Notes on Use
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CAUTION
To avoid damage to the device, protect it from
physical shock when transporting and handling. Be
especially careful to avoid physical shock from
dropping.
This device should be installed and operated
indoors only, between 0 and 40
(32 to 104 )
and 80% RH or less.
Do not store or use the device where it could be
exposed to direct sunlight, high temperature or
humidity, or condensation. Under such conditions,
the device may be damaged and insulation may
deteriorate so that it no longer meets
specifications.
This device is not designed to be entirely water- or
dust-proof. To avoid damage, do not use it in a wet
or dusty environment.
The 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.
The matching surfaces of the sensor head are
precisely ground, and should be treated with care.
If these surfaces are scratched, performance may
be impaired.
Measurements are degraded by dirt on the mating
surfaces of the sensor head, so keep the surfaces
clean by gently wiping with a soft cloth.
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Notes on Use
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CAUTION
Foreign 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.
Refer to NOTE (p. 23) for resonance sound.
To avoid damaging the cables, do not bend or pull
the sensor cable and power supply cable.
Keep the clamp jaws and core slits free from
foreign objects, which could interfere with clamping
action.
・
Do not apply a static electricity or other source of
high voltage to the sensor. Doing so may damage
its internal Hall elements and circuitry
・
To 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.
When the power is on, keep the core section of the
sensor 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
.Do not short-circuit the output terminal and do not
input voltage to the output terminal. The device
may be damaged.
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Notes on Use
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