Hioki 3274 User Manual
INSTRUCTION MANUAL
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3274
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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
1.3 Names of Parts
1.4 Parts of the Sensor
Chapter 2 Specifications 13
2.1 Product Specifications 13
2.2 Standards Applying
Chapter 3 Measurement Procedure 17
3.1 Notes on Use 17
3.2 Preparations for Measurement
3.3 Demagnetizing and Zero Adjustment
3.4 Measurement Procedure
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Introduction
Thank you for purchasing this HIOKI 3274 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
Carrying case 1
1
Notes on Safety
WARNING
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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.
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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
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.
The following symbols in this manual indicate the relative
importance of cautions and warnings.
symbol) before using the relevant
Indicates that incorrect operation presents an extreme
DANGER
hazard that could result in serious injury or death to the
user.
Indicates that incorrect operation presents a significant
WARNING
hazard that could result in serious injury or death to the
user.
CAUTION
NOTE
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
operation of the device.
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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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Notes on Use
Follow these precautions to ensure safe operation and to obtain
the full benefits of the various functions.
DANGER
To avoid short circuits and potentially life-threatening
hazards, follow these precautions.
z Never attach the clamp to a circuit that operates at
more than the maximum rated voltage to earth.
z For safety's sake, avoid clamping around bare
conductors, while clamping or measuring.
z While clamping and measuring, do not touch the
clamp in front of the barrier or the conductor being
measured.
z Be careful to avoid damaging the insulation surface
while taking measurements.
z This device is made for use with the 3269 or 3272
POWER SUPPLY. It is possible to use a pow er
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.
z Make sure that the waveform measuring equipment
connected to this device's output terminal (BNC) is
equipped with a protective earthing with doubleinsulation construction.
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DANGER
z If 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
the measurement category
pollution degree
requirements of the circuit being
, working voltage, and
conforming to
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
z 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
z 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 nonground 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
z Do 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
z To avoid damage to the device, protect it from vibration
or shock during transport and handling, and be
especially careful to avoid dropping.
z Do 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.
z 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.
z 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.
z 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.
z The matching surfaces of the sensor head are
precision ground, and should be treated with care. If
these surfaces are scratched, performance may be
impaired.
z 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.
z To avoid damaging the sensor cable and power supply
cable, do not bend or pull the cables.
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