Hioki 3274 User manual

3275

CLAMP ON PROBE

3274

Instruction Manual

May 2015 Revised edition 5

3275A981-05 15-05H

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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 15

Chapter 3 Measurement Procedure 19

3.1 Notes on Use 19

3.2 Preparations for Measurement 20

3.3 Demagnetizing and Zero Adjustment 21

3.4 Measurement Procedure 22

3275A981-05

___________________________________________________________________

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, 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

___________________________________________________________________

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.

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.

___________________________________________________________________

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

〝2 Specifications〟(p. 12).)

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.

Notes on Use

Follow these precautions to ensure safe operation and to obtain

the full benefits of the various functions.

___________________________________________________________________

DANGER Before clamping the conductor being measured,

make sure that the insulation on the conductor is

undamaged. Also, take care not to damage the

insulation when clamping the conductor. Any damage

to 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.

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.

___________________________________________________________________

DANGER 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 or 3272, or this device

from the ground terminal, which could cause an

electrical accident or damage.

Power Source

Load Load

___________________________________________________________________

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.

CAUTION To avoid damage to the device, protect it from vibration

or shock during transport and handling, and be

especially careful to avoid dropping.

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.

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.

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.

___________________________________________________________________

CAUTION 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.

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.

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 (p26) for resonance sound.

To avoid damaging the sensor cable and power supply

cable, do not bend or pull the cables.

When 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.

Do not short-circuit the output terminal and do not input

voltage to the output terminal. The device may be

damaged.

Note that the device may be damaged if the applied

current exceeds the measurement range.

When the 3269, 3272 Power Supply or waveform

measurement instrumentʼs power is turned off, do not

apply current to the device. Doing so may damage the

device, the 3269, 3272 Power Supply and/or waveform

measurement instrument.

NOTE Correct 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

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.

If the device seems to be malfunctioning, contact your dealer or

Hioki representative.

When 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.

Hioki cannot be responsible for damage that occurs during

shipment.

Use the original packing materials when transporting the device,

if possible.

Transport the device in its carrying case.

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