User’s
Manual
701930
Current Probe
Yokogawa Electric Corporation
IM 701930-01E
2nd Edition
Foreword
Revisions
Thank you for purchasing the Current Probe (Model 701930).
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.
1st Edition: June, 2001
2nd Edition: November, 2005
Disk No. OE12
2nd Edition: November 2005 (YK)
All Rights Reserved, Copyright © 2001 Yokogawa Electric Corporation
IM 701930-01E
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The following symbols are used in this manual to alert you to important information.
Affixed to the instrument. Indicates danger to personnel or
instrument and the operator must refer to the User's Manual. The
symbol is used in the User's Manual to indicate the reference.
WARNING
CAUTION
Note
Describes precautions that should be observed to prevent serious
injury or death to the user.
Describes precautions that should be observed to prevent minor or
moderate injury, or damage to the instrument.
Provides important information for the proper operation of the
instrument.
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 701930) Main Body
Accessories
• One user’s manual (this document).
• Carrying case
ii IM 701930-01E
Safety Precautions
This probe meets the Measurement Category II and III, and Pollution Degree 2
requirements as given in the IEC-61010-1 standards.
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 Electric Corporation 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.
IM 701930-01E
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Precautions
In order to ensure safe operation and to obtain maximum performance from the
unit, observe the cautions listed below.
WARNING
• To avoid short circuits and accidents that could result in injury or death, use this
current probe only with power lines carrying 600 V or less (CATII), or 300 V or
less (CATIII).
• Also 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.
• When applying the clamp or taking measurements, don’t touch the clamp
anywhere from the edge of the barrier up to the conductor being measured.
• Be careful not to damage the insulation surface while taking measurements.
• This instrument is made for use with the Power Supply (Model 700938 or
701934). It is possible to use a power supply other than the 700938 or 701934,
provided that the connector and pin assignments match, and that voltage and
other electrical specifications are satisfied. Regardless of which power supply is
used, for safety, make sure that it has a
insulation construction.
• Make sure that the waveform measuring equipment connected to this unit’s
output terminal (BNC) is equipped with a power supply having a
earthing with double-insulation construction.
• If the waveform measuring instrument connected to this unit’s output terminal
(BNC) is equipped with any other input terminal, take the following precautions
to ensure that the other instrument does not form a bridge between the probe
and any
1 Isolate the terminal to which the probe is connected from other terminals on
2 If
3 Make sure to ground the measuring instrument.
4 Beware of electric shock when connecting the probe to the item being
5 Before connecting the probe, check that the measuring instrument and power
6 Read and observe all warnings and precautions relating to electrical safety
• To prevent electric shock, do not allow the unit to become wet and do not use
the unit when your hands are wet.
hazardous live parts.
the measuring instrument using
overvoltage category, working voltage, and pollution degree requirements of
the circuit being tested.
basic insulation requirements cannot be met between the terminal to which
this unit is connected and other terminals of the measuring instrument, make
sure that the voltage input to the measurement terminal does not exceed the
safe voltage level(SELV-E)*.
measured. Do not remove the probe from the instrument while the probe is
connected to the item.
supply are properly grounded and that the output connector and power plug
are connected to the BNC connector and power receptacle, respectively.
for the measuring instrument being connected to the probe.
Refer to the following standards regarding the meanings of underlined terms.
IEC61010-1
IEC61010-2-031
IEC61010-2-032
protective earthing with double-
protective
basic insulation conforming to the
* Do not exceed the following levels: 30 Vrms, 42.4 Vpeak, and 60 VDC.
iv IM 701930-01E
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.
• 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.
• 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.
IM 701930-01E
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.
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