品名を入力。 CLAMP ON PROBEThank you for purchasing this HIOKI 3274 CLAMP ON PROBE. To obtain maximum performance from the device, please read this manual first, and keep it

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不要の場合はとる。

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3274品名を入力。

CLAMP ON PROBE

Contents

Introduction 1

Inspection 1

Notes on Safety 1

Notes on Use 4

Chapter 1 Overview 91.1 Product Overview 91.2 Features 91.3 Names of Parts 101.4 Parts of the Sensor 11

Chapter 2 Specifications 132.1 Product Specifications 132.2 Standards Applying 14

Chapter 3 Measurement Procedure 173.1 Notes on Use 173.2 Preparations for Measurement 203.3 Demagnetizing and Zero Adjustment 213.4 Measurement Procedure 22

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WARNING This device is designed to comply with IEC 61010Safety Standards, and has been thoroughly tested forsafety prior to shipment. However, mishandlingduring use could result in injury or death, as well asdamage to the device. Be certain that you understandthe instructions and precautions in the manual beforeuse. We disclaim any responsibility for accidents orinjuries 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 thismanual first, and keep it handy for future reference.

When you receive the device, inspect it carefully to ensure that nodamage occurred during shipping. If damage is evident, or if itfails to operate according to the specifications, contact your dealeror Hioki representative.

Supplied accessoriesInstruction manual 1Carrying case 1

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The symbol printed on the device indicates that the usershould refer to a corresponding topic in the manual(marked with the symbol) before using the relevantfunction.In the manual, the symbol indicates particularlyimportant information that the user should read beforeusing the device.

Wear appropriate protective insulation (insulating rubbergloves and boots, helmet and etc.) when connecting anddisconnecting from live electric circuits.

DANGERIndicates that incorrect operation presents an extremehazard that could result in serious injury or death to theuser.

WARNINGIndicates that incorrect operation presents a significanthazard that could result in serious injury or death to theuser.

CAUTIONIndicates that incorrect operation presents a possibility ofinjury to the user or damage to the device.

NOTEIndicates advisory items related to performance or correctoperation of the device.

Safety Symbols

This manual contains information and warnings essential for safeoperation of the device and for maintaining it in safe operatingcondition. Before using the device, be sure to carefully read thefollowing safety notes.

The following symbols in this manual indicate the relativeimportance 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 61010establishes safety standards for various electrical environments,categorized as CAT I to CAT IV, and called measurementcategories. 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, householdappliances, etc.)

CAT III : Primary electrical circuits of heavy equipment (fixedinstallations) connected directly to the distributionpanel, and feeders between the distribution panel andoutlets.

CAT IV : The circuit from the service drop to the service entrance,then to the power meter and to the primary overcurrentprotection instrument.

Higher-numbered categories correspond to electrical environmentswith greater momentary energy. So a measurement devicedesigned for CAT III environments can endure greater momentaryenergy than a device designed for CAT II.Using a measurement device in an environment designated with ahigher-numbered category than that for which the device is ratedcould result in a severe accident, and must be carefully avoided.Never use a CAT I measuring device in CAT II, III, or IVenvironments.The measurement categories comply with the OvervoltageCategories of the IEC60664 Standards.

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DANGER To avoid short circuits and potentially life-threateninghazards, follow these precautions.Never attach the clamp to a circuit that operates atmore than the maximum rated voltage to earth.For safety's sake, avoid clamping around bareconductors, while clamping or measuring.While clamping and measuring, do not touch theclamp in front of the barrier or the conductor beingmeasured.Be careful to avoid damaging the insulation surfacewhile taking measurements.This device is made for use with the 3269 or 3272POWER SUPPLY. It is possible to use a powersupply other than the 3269 or 3272, provided thatthe connector and pin assignments match, and thatvoltage and other electrical specifications aresatisfied. In the interest of safety, make sure thatthe power supply has a protective earthing withdouble-insulation construction.Make sure that the waveform measuring equipmentconnected to this device's output terminal (BNC) isequipped with a protective earthing with double-insulation construction.

Notes on UseFollow these precautions to ensure safe operation and to obtainthe full benefits of the various functions.

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DANGER If the waveform measuring instrument beingconnected to the output terminal (BNC) on thisdevice is equipped with any other measurementterminals, take the following precautions to ensurethat the other instrument does not form a bridgebetween the probe and any hazardous live of apart.1. Isolate the terminal to which the probe isconnected from other terminals on the measuringinstrument using basic insulation conforming tothe measurement category, working voltage, andpollution degree requirements of the circuit beingtested.

2. If basic insulation requirements cannot be metbetween the terminal to which this device isconnected and other terminals of the measuringinstrument, make sure that the voltage input tothe measurement terminal does not exceed theSeparated Extra-Low Voltage Earthed (SELV-E).

3. Read and observe all warnings and precautionsrelating to electrical safety for the measuringinstrument being connected to the probe.

Refer to the following standards regarding themeanings of underlined terms.IEC 61010-1IEC 61010-031IEC 61010-2-032

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DANGER Be sure to observe all operating precautions for thewaveform monitoring instrument (oscilloscope orrecorder) and other measurement instruments towhich this device is connectedWhen using a measurement instrument that doesnot provide isolation between its input terminalsand chassis or other input terminals, please payattention to the following points.If a signal is applied to an input terminal other thanthat to which this device is connected, do notconnect the ground-side terminal to any non-ground potential. Otherwise, short-circuit currentwill flow through the 3269 or 3272, or this devicefrom the ground terminal, which could cause anelectrical accident or damage.

WARNING Do not allow the device to get wet, and do not takemeasurements with wet hands. This may cause anelectric shock.

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CAUTION To avoid damage to the device, protect it from vibrationor shock during transport and handling, and beespecially careful to avoid dropping.Do not store or use the device where it could beexposed to direct sunlight, high temperature, humidity,or condensation. Under such conditions, the devicemay be damaged and insulation may deteriorate sothat it no longer meets specifications.Before using the device the first time, verify that itoperates normally to ensure that the no damageoccurred during storage or shipping. If you find anydamage, contact your dealer or Hioki representative.This device is not designed to be entirely water- ordust- proof. To avoid damage, do not use it in a wet ordusty environment.The sensor head is a precision assembly including amolded component, a ferrite core, and a Hall effectelement. It may be damaged if subjected to suddenchanges in ambient temperature, or mechanical strainor shock, and therefore great care should be exercisedin handling it.The matching surfaces of the sensor head areprecision ground, and should be treated with care. Ifthese surfaces are scratched, performance may beimpaired.Foreign substances such as dust on the contactsurfaces of the sensor head can cause acousticresonance and degrade measurement, so it should becleaned by gently wiping with a soft cloth.To avoid damaging the sensor cable and power supplycable, do not bend or pull the cables.

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CAUTION When the power is on, keep closed, except whenclamping them onto the conductor to be measured.The facing surface of the core section can bescratched while it is open.

NOTE Correct measurement may be impossible in the presence of strongmagnetic fields, such as near transformers and high-currentconductors, or in the presence of strong electromagnetic fieldssuch as near radio transmitters.

Service / Maintenance

To clean the device, wipe it gently with a soft cloth moistenedwith water or mild detergent. Never use solvents such asbenzene, alcohol, acetone, ether, ketones, thinners or gasoline, asthey can deform and discolor the case.

If the device seems to be malfunctioning, contact your dealer orHioki representative.

When sending the device for repair, pack carefully to preventdamage in transit. Include cushioning material so the devicecannot move within the package. Be sure to include details ofthe problem.

Hioki cannot be responsible for damage that occurs duringshipment.

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Chapter 1 Overview――――――――――――――――――――――――――――――――――

Chapter 1Overview

1.1 Product Overview

1.2 Features

This device can be directly connected to a BNC input connectorof a waveform measuring instrument such as an oscilloscope orrecorder, and by clamping on a conductor to be measured, allowsthe current waveform to be easily captured.

Highly accurate current detection.Easy current measurement.Broadband frequency characteristics DC to 10 MHz.Large diameter allows high-current measurements.Easy protection function to avoid self-heating during excessiveinput.Unique HIOKI development of thin film Hall effect element

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Current direction indication Terminator

Sensor cable

Power supply cable

"UNLOCK" indication

(inside)

Sensor

"LOCK" indication

3

41

5 2

2

7

86

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1.3 Names of PartsExternal view

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1.4 Parts of the Sensor1. Clamp

This clamps around the conductor to be measured.2. Slider

This slider opens the clamp. Always use it to open and close theclamp.

3. LeverThis lock mechanism keeps the clamp closed.

4. Sensor headThis clamps the conductor being measured, and carries out theactual current measurement. It is a precision assembly including amolded component, a ferrite core, and a Hall effect element. Itmay be damaged if subjected to sudden changes in ambienttemperature, or mechanical strain or shock, and therefore greatcare should be exercised in handling it.

5. BarrierThis structure reduces the likelihood of touching the conductorwhile testing, and indicates the limit of safe physical contact.Avoid touching the clamp in front of the barrier when clampingor measuring.

6. Demagnetizing switch (DEMAG)

This demagnetizes the core if it has been magnetized by switchingthe power on and off, or by an excessive input. Always carry outdemagnetizing before measurement.The demagnetizing process takes about 3 second. Duringdemagnetizing, a demagnetizing waveform is output.

7. Zero adjustment dial (ZERO ADJ)Use the zero adjustment dial to correct for the effect of a voltageoffset or temperature drift on the device.When beginning measurement, after demagnetizing always carryout zero adjustment.

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NOTE

8. Output connectorThe current waveform of the measured conductor is output at aconstant rate (0.01 V/A).Connect to the BNC input connector of the waveform measuringinstrument.

The output of this device is terminated internally. Use a high-impedance input to the measuring instrument. With an inputimpedance of 50 Ω, accurate measurement is not possible.If using BNC-banana plug adapters or similar to connect to inputterminals other than BNC connectors, make sure the polarity iscorrect.Turn the collar until it clicks, and check that it is lockedsecurely.

9. Power plugConnect this to the 3269 or 3272 POWER SUPPLY receptacle tosupply power to the sensor terminator.

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Chapter 2 Specifications――――――――――――――――――――――――――――――――――

Bandwidth DC to 10 MHz (-3 dB)(Typical characteristics shown in Fig.1)

Rise time 35 ns or lessMaximumcontinuous inputrange

150 ADerating according to frequency shown in Fig.2

Maximum peakcurrent value

Non-continuous 300 A peak;at pulse width 30 μs, 500 A peak

Output voltage rate 0.01 V/AAmplitudeaccuracy

To 150 A: 1.0% rdg. 1 mV150 A to 300 Apeak: 2.0% rdg.(DC, and 45 to 66 Hz)

Noise Equivalent to 25 mA rms or less (for 20 MHz bandmeasuring instrument)

Input impedance (Typical characteristics shown in Fig.3)Temperaturecoefficient forsensitivity

2% or less (Input: 55 Hz 150 A, within a range of 0to 40 , within a range of 32 to 104 )

Maximum ratedpower

5.5 VA max. (within maximum continuous input range)

Rated supplyvoltage

12 V 1 V

Chapter 2Specifications

2.1 Product SpecificationsGuaranteed at 23 ±5 (73 ±9 ) after the power has beenon for 30 minutes.

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Operatingtemperature andhumidity range

0 to 40 (32 to 104 ), 80 %RH or less (nocondensation)

Storagetemperature andhumidity range

-10 to 50 (14 to 122 ), 80 %RH or less (nocondensation)

Location for use Indoor, altitude up to 2000 m (6562 feet)Period ofguaranteedaccuracy

1 year (Opening/Closing up to 10,000 times)

Effect of externalmagnetic fields

Equivalent to a maximum of 150 mA (in a DC or 60Hz, 400 A/m magnetic field)

Maximum ratedvoltage to earth

600 V CAT II, 300 V CAT III (insulated conductor)

Diameter ofmeasurableconductors

20 mm dia.0.79" dia.

Cable lengths Sensor cable Approx. 2 m (78.7")Power supply cable Approx. 1 m (39.4")

Externaldimensions

Sensor Approx. 176W X 69H X 27D mm Approx. 6.93"W X 2.72"H X 1.06"DTerminator Approx. 27H X 55W X 18D mm Approx.1.06"W X 2.17"H X 0.71"D

Mass Approx. 500 gApprox. 17.6 oz.

Accessories Instruction manual, Carrying case

Safety EN61010-2-032:2002Measurement category II, III (anticipated transientovervoltage 4000 V), Pollution Degree 2

EMC EN61326:1997+A1:1998+A2:2001+A3:2003

2.2 Standards Applying

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Fig.1 Frequency characteristics (Typical characteristics)

Frequency [Hz]

Ampli

tude [

db, 0

dB=1

V]

Frequency [Hz]

Maxim

um in

put c

urren

t [Arm

s]

Fig.2 Derating according to frequency

Input

impe

danc

e [oh

m]

Fig.3 Input impedance (Typical characteristics)Frequency [Hz]

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Chapter 3 Measurement Procedure――――――――――――――――――――――――――――――――――

DANGER To avoid short circuits and potentially life-threateninghazards, follow these precautions.Never attach the clamp to a circuit that operates atmore than the maximum rated voltage to earth.For safety's sake, avoid clamping around bareconductors, while clamping or measuring.While clamping and measuring, do not touch theclamp in front of the barrier or the conductor beingmeasured.Be careful to avoid damaging the insulation surfacewhile taking measurements.This device is made for use with the 3269 or 3272POWER SUPPLY. It is possible to use a powersupply other than the 3269 or 3272, provided thatthe connector and pin assignments match, and thatvoltage and other electrical specifications aresatisfied. In the interest of safety, make sure thatthe power supply has a protective earthing withdouble-insulation construction.Make sure that the waveform measuring equipmentconnected to this device's output terminal (BNC) isequipped with a protective earthing with double-insulation construction.

Chapter 3Measurement Procedure

3.1 Notes on Use

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DANGER Make sure that the waveform measuring equipmentconnected to this device's output terminal (BNC) isequipped with a protective earthing with double-insulation construction.If the waveform measuring instrument beingconnected to the output terminal (BNC) on thisdevice is equipped with any other measurementterminals, take the following precautions to ensurethat the other instrument does not form a bridgebetween the probe and any hazardous live of apart.1. Isolate the terminal to which the probe isconnected from other terminals on the measuringinstrument using basic insulation conforming tothe measurement category, working voltage, andpollution degree requirements of the circuit beingtested.

2. If basic insulation requirements cannot be metbetween the terminal to which this device isconnected and other terminals of the measuringinstrument, make sure that the voltage input tothe measurement terminal does not exceed theSeparated Extra-Low Voltage Earthed (SELV-E).

3. Read and observe all warnings and precautionsrelating to electrical safety for the measuringinstrument being connected to the probe.

Refer to the following standards regarding themeanings of underlined terms.IEC 61010-1IEC 61010-031IEC 61010-2-032

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DANGER Be sure to observe all operating precautions for thewaveform monitoring instrument (oscilloscope orrecorder) and other measurement instruments towhich this device is connectedWhen using a measurement instrument that doesnot provide isolation between its input terminalsand chassis or other input terminals, please payattention to the following points.If a signal is applied to an input terminal other thanthat to which this device is connected, do notconnect the ground-side terminal to any non-ground potential. Otherwise, short-circuit currentwill flow through the 3269 or 3272, or this devicefrom the ground terminal, which could cause anelectrical accident or damage.

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CAUTION Before turning on the power, make sure that the voltageof the power supply being used matches the supplyvoltage indicated on the rear panel of the 3269 or 3272.

NOTE

3.2 Preparations for Measurement(1) Have the 3269 or 3272 POWER SUPPLY, and oscilloscope or

recorder for waveform measurement ready.

The output of this device is terminated internally. Use a high-impedance input to the measuring instrument. With an inputimpedance of 50 Ω, accurate measurement is not possible.Depending on the current value being measured, there are casesin which two CLAMP ON PROBEs cannot be usedsimultaneously on the 3272. Power consumption on the CLAMPON PROBE depends on the current value being measured.

(2) Turn the power switch off and connect the power cord.(3) Connect the power plug of the 3274 to the power receptacle of the

3269 or 3272.

(4) Turn the 3269 or 3272 power switch on, and check that the frontpanel power indicator lights.

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CAUTIONWhen disconnecting the output connector, be sure torelease the lock before pulling off the connector. Forciblypulling the connector without releasing the lock, or pullingon the cable, can damage the terminator.If using BNC-banana plug adapters or similar to connectto input terminals other than BNC connectors, make surethe polarity is correct.Do not demagnetize while the 3274 is clamping aconductor to be measured. Demagnetizing causes currentto flow into the conductor, which may damage parts in thecircuit to be measured.

Demagnetizing

Conductor

Check that the conductor being measured is not clampedwhen supplying power to the 3274 for the same reason.Demagnetized waveforms are generated when supplyingelectric power.

3.3 Demagnetizing and Zero Adjustment(1) With the waveform measurement instrument input at ground,

adjust the trace to the zero position.

(2) Set the input coupling of the waveform measurement instrumentto DC.

(3) Connect the output connector of the 3274 to the input connectorof the waveform measurement instrument. Turn the collar until itclicks, and check that it is locked securely.

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I

3.4 Measurement Procedure

(4) Before clamping a conductor, confirm that the clamp can besecurely closed: press the slider until UNLOCK is no longerdisplayed, and hold it until LOCK appears.

(5) Press the demagnetizing switch (DEMAG) on the terminator.

(6) Turn the zero adjustment dial on the terminator, to adjust the traceto the zero position.

(1) Check that the system is safe, and that the preparations describedin the preceding section have been carried out.

(2) Pull the sensor slider, so that the clamp opens.

(3) Align the sensor so that the current direction indicationcorresponds to the direction of current flow through the conductorto be measured, and clamp so that the conductor is in the centerof the sensor aperture.

(4) Press the slider on the sensor head until the "UNLOCK"indication disappears, and hold it until LOCK appears, and checkthat the opening lever is firmly locked and the clamp securelyclosed.

(5) It is now possible to monitor the current waveform. The outputrate of the 3274 is 0.01 V/A. The current sensitivity can bederived from the voltage sensitivity of the waveform measurementinstrument. For example, if the voltage sensitivity is 10mV/division, the current sensitivity is 1 A/division.

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NOTE

0

100

200

300

400

500

600

0 100 200 300

AC(f=50Hz)DCCo

nsum

ptio

n cu

rren

t (m

A)

Current (A)

CAUTION The maximum continuous input range is based onheat that is internally generated duringmeasurement. Never input current in excess of thislevel. Exceeding the rated level may result indamage to the probe.The maximum continuous input range variesaccording to the frequency of the current beingmeasured. See the figures in Chapter 2,"Specifications"If excess current is input, generated heat activatesa built-in safety function that blocks normal output.If this happens, remove the input immediately(remove the sensor from the conductor beingmeasured, or reduce the input current to zero).Wait until the sensor has had sufficient time to coolbefore resuming operation.

･ When using the 3274, note that two clamp-on probes may not beused simultaneously with the 3272 POWER SUPPLY, dependingon the current to be measured.･ The current consumption of clamp-on probes depends on the

current to be measured. Confirm that the total currentconsumption of the clamp-on probes does not exceed the ratedoutput current of the 3272. See Figure 1.

Fig.1

Current consumption* vs. current to be measured (typical)*The sum total of a positive and negative current consumption

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CAUTION Even if the input current does not exceed the ratedcontinuous maximum, continuous input for anextended period of time may result in activation ofthe safety circuit to prevent damage resulting fromheating of the sensor.At high ambient temperatures, the built-in safetycircuit may activate at current input levels belowthe rated continuous maximum.Continuous input of current exceeding the ratedmaximum or repeated activation of the safetyfunction may result in damage to the device.The probe is rated for maximum input under twoconditions in addition to the input maximumsshown in the Product Specifications. These are (1)300 Apeak, for non-continuous input, and (2) 500Apeak for pulse widths 30 μs. (1) indicates anupper waveform response limit of 300 Apeak. Usethe sensor at RMS current input levels that arewithin the rated continuous maximums. (2)indicates the upper response limit for a single inputpulse. Do not allow current level to exceed thespecified limit of the operating range.To avoid damage to the device, when opening theclamp of the probe, be sure to operate with theslider.

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NOTE The output of this device is terminated internally. Use awaveform measurement instrument with an input impedance of atleast 1 MΩ.

Immediately after powering on, this device may be subject to anappreciable offset drift due to the effect of self-heating. Tocounteract this, allow the device to warm up for about 30minutes before carrying out measurement.

When performing continuous measurements, it is necessary to beaware that the offset voltage drifts, depending on factors such asthe ambient temperature.

Under certain circumstances, oscillation may occur if the probe isconnected to the 3269 or 3272 POWER SUPPLY while thepower supply is on. This does not indicate a malfunction.Oscillation can be stopped and operation restored to normal byopening and closing the clamp.

Acoustic resonance may occur depending on the level andfrequency of the measured current. This does not normally affectmeasurements unless a foreign substance such as dust is presenton the contact surfaces of the sensor head.

The reading may be affected by the position within the clampaperture of the conductor being measured. The conductor shouldbe in the center of the clamp aperture.

When carrying out measurement, press the slider on the sensorhead until the "UNLOCK" indication disappears, and hold it untilLOCK appears, and check that the opening lever is firmly lockedand the clamp securely closed. Correct measurements cannot beperformed unless the clamp is securely closed and the slider ispressed until LOCK is displayed.

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Power source Load

High

Low

At high frequencies, common mode noise may affectmeasurements taken on the high voltage side of circuits. If thisoccurs, reduce the frequency range of the waveform measuringinstrument, or clamp onto the low-voltage side of the circuit, asappropriate.

When power is turned on, a demagnetizing waveform is initiallyapplied to the output: this is intentional in the design, and not afault.Accurate measurement may be impossible in locations subject tostrong external magnetic fields, such as transformers and high-current conductors, or in locations subject to strong externalelectric fields, such as radio transmission equipment.

HIOKI 3274 CLAMP ON PROBE

Instruction Manual

Publication date: September 2006 Revised edition 4

Edited and published by HIOKI E.E. CORPORATIONTechnical Support Section

All inquiries to International Sales and Marketing Department

81 Koizumi, Ueda, Nagano, 386-1192, Japan

TEL: +81-268-28-0562 / FAX: +81-268-28-0568

E-mail: [email protected]

URL http://www.hioki.co.jp/

Printed in Japan 3274A981-04

All reasonable care has been taken in the production of this manual,but if you find any points which are unclear or in error, pleasecontact your supplier or the International Sales and MarketingDepartment at HIOKI headquarters.In the interests of product development, the contents of this manualare subject to revision without prior notice.Unauthorized reproduction or copying of this manual is prohibited.

HEAD OFFICE81 Koizumi, Ueda, Nagano 386-1192, JapanTEL +81-268-28-0562 / FAX +81-268-28-0568E-mail: [email protected] / URL http://www.hioki.co.jp/

HIOKI USA CORPORATION6 Corporate Drive, Cranbury, NJ 08512, USATEL +1-609-409-9109 / FAX +1-609-409-9108

3274A981-04 06-09H

Printed on recycled paper

2003-01改訂　　枠消す

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/Description > /Namespace [ (Adobe) (Common) (1.0) ] /OtherNamespaces [ > /FormElements false /GenerateStructure true /IncludeBookmarks false /IncludeHyperlinks false /IncludeInteractive false /IncludeLayers false /IncludeProfiles true /MultimediaHandling /UseObjectSettings /Namespace [ (Adobe) (CreativeSuite) (2.0) ] /PDFXOutputIntentProfileSelector /NA /PreserveEditing true /UntaggedCMYKHandling /LeaveUntagged /UntaggedRGBHandling /LeaveUntagged /UseDocumentBleed false >> ]>> setdistillerparams> setpagedevice

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品名を入力。 CLAMP ON PROBEThank you for purchasing this HIOKI 3274 CLAMP ON PROBE. To obtain maximum performance from the device, please read this manual first, and keep it