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 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 3274 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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