YOKOGAWA 701931 User manual

User’s
Manual
IM 701931-01E
8th Edition
701931
Current Probe

i
IM 701931-01E
Thank you for purchasing the Current Probe (Model 701931).
This instruction manual contains useful information about the instrument’s
functions and operating procedures as well as precautions that should be
observed during use. To ensure proper use of the instrument, please read this
manual thoroughly before beginning operation.
After reading the manual, keep it in a convenient location for quick reference
whenever a question arises during operation.
List of Manuals
The following manuals are provided for the Current Probe (Model 701931).
Manual Title Manual No. Notes
701931 Current Probe
User’s Manual
IM 701931-01E This manual.
701931 Current Probe
User’s Manual
IM 701931-92 Document for China
701931 Current Probe
User’s Manual
IM 701931-93Z2 Document for Korea
The “E” and “Z2” in the manual numbers are the language codes.
Contact information of Yokogawa offices worldwide is provided on the following
sheet.
Document No. Description
PIM113-01Z2 List of worldwide contacts
Revisions
1st Edition: August, 2003
2nd Edition: September, 2004
3rd Edition: November, 2005
4th Edition: October, 2013
5th Edition: October, 2014
6th Edition: November, 2015
7th Edition: January, 2016
8th Edition: October, 2017
8th Edition: October 2017 (YMI)
All Rights Reserved, Copyright © 2003 Yokogawa Electric Corporation
All Rights Reserved, Copyright © 2013 Yokogawa Test & Measurement Corporation

ii IM 701931-01E
Checking the Contents of the Package
If the wrong instrument or accessories have been delivered, or if some
accessories are missing or defective, contact the dealer from which you
purchased them.
Current Probe (Model 701931) Main Body
Accessories
• User’smanuals 1set
• Carryingcase
Safety Precautions
This probe meets the requirements as given in the IEC-61010.
The following general safety precautions must be observed during all phases of
operation, service, and repair of this instrument. If this instrument is used in a
manner not specified in this manual, the protection provided by this instrument
may be impaired. Also, YOKOGAWA assumes no liability for the customer’s
failure to comply with these requirements.
The following symbols are used on this instrument.
To avoid injury, death of personnel or damage to the instrument, the
operator must refer to an explanation in the User’s Manual or Service
Manual.
Both direct and alternating current.
Do not apply around or remove from HAZARDOUS LIVE conductors.

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IM 701931-01E
Important Information for Users
In order to ensure safe operation and to obtain maximum performance from the
unit, observe the cautions listed below.
WARNING
Connection with Power Supply and Protective Grounding
Connect the power supply to the probe power supply terminal of a
waveform measuring instrument such as YOKOGAWA DL/DLM series, or
use the Power Supply (Model 701934).
Connecting the Probe to the Item under Test
• Ifyouneedtotouchthecircuitwithyourhand,firstcutthepowertothe
circuit and confirm that it is not carrying any voltage.
• Toavoidshortcircuitsandpersonalinjurywhentheclampisopenor
measurement is being performed, do not apply the clamp to any bare
conductors.
Restrictions on the Measuring Instrument
Read and observe all warnings and precautions relating to electrical safety
for the measuring instrument being connected to the probe.
Do Not Operate When Wet
To prevent electric shocks, do not allow the unit to become wet and do not
use the unit when your hands are wet.
Do Not Operate Near Flammable Materials
Do not operate the probe in the presence of flammable or explosive liquids
or vapors.
Do Not Use When Removed from the Case
To avoid electric shock or fire, never use the probe if the case has been
removed.
* Do not exceed the following levels: 30 Vrms, 42.4 Vpeak, and 60 VDC.
CAUTION
• Donotsubjecttheunittovibrationsorshocksduringtransportor
handling. Be especially careful to avoid dropping the unit.
• Donotstoreoroperatetheunitwhereitwillbeexposedtodirect
sunlight, high temperature, high humidity, or condensation. If exposed
to such conditions, the unit may become damaged, the insulation may
deteriorate, and the unit may no longer satisfy its specifications.
• Beforeusingtheunit,inspectitandchecktheoperationtomakesure
that it was not damaged due to poor storage or transport conditions. If
damage is found, contact your dealer or YOKOGAWA representative.

iv IM 701931-01E
• Thisinstrumentisnotwaterproofordustproof.Donotusetheunit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precisionground,
and should be treated with care. If these surfaces are scratched,
performance may be impaired.
• Ifthereisanytypeofdustordirtonthematchingsurfacesofthesensor
head, measurements may be affected. Wipe it away gently with a soft
cloth.
• Inordertoavoiddamagingthesensorcablesdonotbendorpullthe
sensor cable or power supply cable.
• Currentsensorscanbedamagedbystaticelectricity.Becarefulnotto
apply static electricity to current sensors. Below are some ways you
could apply static electricity.
• Touchingthesensorheadwithanobjectchargedwithstaticelectricity
• Touchingthesensorheadwithanobjectwhoseelectricpotentialis
different
• Auserchargedwithstaticelectricitytouchingthecoresurfacewhen
cleaning the matching surfaces of the sensor head
(When cleaning the surfaces, take static electricity measures such as
wearing an antistatic wrist strap.)
• Gentlywipedirtfromthesurfaceoftheunitwithasoftclothmoistened
with a small amount of water or mild detergent. Do not try to clean
the unit using cleaners containing organic solvents such as benzene,
alcohol, acetone, ether, ketones, thinners, or gasoline. They may cause
discoloration or damage.
• WhenthepowerisON,keepthecoresectionofthesensorclosed,
except when clamping it onto the conductor to be measured. The facing
surface of the core section can be scratched while it is open.
Note
• Accuratemeasurementmaybeimpossibleinlocationssubjecttostrongexternal
magnetic fields, such as near transformers and high-current conductors, or in
locations subject to strong external electric fields, such as near radio transmission
equipment.
• Dependingonthecurrentfrequencythatismeasured,oscillationmayoccur,but
this has no effect on measurements.

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IM 701931-01E
Sales in Each Country or Region
Waste Electrical and Electronic Equipment
Waste Electrical and Electronic Equipment (WEEE), Directive
(This directive is valid only in the EU.)
This product complies with the WEEE directive marking requirement.
This marking indicates that you must not discard this electrical/
electronic product in domestic household waste.
Product Category
With reference to the equipment types in the WEEE directive, this
product is classified as a “Monitoring and control instruments”
product.
When disposing products in the EU, contact your local Yokogawa
Europe B.V. office.
Do not dispose in domestic household waste.
Authorized Representative in the EEA
Yokogawa Europe B.V. is the authorized representative of Yokogawa Test &
Measurement Corporation for this product in the EEA. To contact Yokogawa
Europe B.V., see the separate list of worldwide contacts, PIM 113-01Z2.

vi IM 701931-01E
The following markings are used in this manual.
Improper handling or use can lead to injury to the user or
damage to the instrument. This symbol appears on the
instrument to indicate that the user must refer to the user’s
manual for special instructions. The same symbol appears in
the corresponding place in the user’s manual to identify those
instructions. In the manual, the symbol is used in conjunction
with the word “WARNING” or “CAUTION.”
WARNING Describes precautions that should be observed to prevent
serious injury or death to the user.
CAUTION Describes precautions that should be observed to prevent
minor or moderate injury, or damage to the instrument.
Note Provides important information for the proper operation of the
instrument.

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IM 701931-01E
Contents
List of Manuals................................................................................................................... i
Checking the Contents of the Package............................................................................. ii
Safety Precautions............................................................................................................ ii
Sales in Each Country or Region...................................................................................... v
The following markings are used in this manual. ............................................................. vi
Chapter 1 701931 Current Probe
Product Overview...........................................................................................................1-1
Features.........................................................................................................................1-1
Names of Parts ..............................................................................................................1-2
Description of Parts........................................................................................................1-3
Measurement Procedure ...............................................................................................1-4
Notes on Use ......................................................................................................1-4
Preparations for Measurement ...........................................................................1-5
Demagnetizing and Zero Adjustment..................................................................1-6
Measurement Procedure ....................................................................................1-7
Specifications...............................................................................................................1-10
Product Specifications ......................................................................................1-10
Applicable Standards........................................................................................1-11
Chapter 2 Malfunction? First, Investigate.
Corrective Action to be Taken in Case of an Abnormality ..............................................2-1

1-1
IM 701931-01E
1
2
Chapter 1 701931 Current Probe
Product Overview
This unit can be directly connected to a BNC input connector of a waveform
measuring instrument such as YOKOGAWA DL/DLM series, and by clamping
it to a conductor to be measured, allows the current waveform to be easily
captured.
Features
• Highlyaccuratecurrentdetection
• Easycurrentmeasurement
• Widebandfrequencycharacteristics;DCto2MHz
• Wideclamppermitsmeasurementofhighcurrentlevels
• Easyprotectfunctionduringexcessiveinput
701931 Current Probe

1-2 IM 701931-01E
Names of Parts
Terminator
Sensor
Power Supply Cable
Sensor Cable
LOCK Indication
2
1
4 (internal)
3
5
6
7
8
2
UNLOCK Indication
Current Direction Indication