YOKOGAWA 701930 User manual

User’s
Manual
IM 701930-01E
9th Edition
701930
Current Probe

User Registration
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allow us to serve you best by completing the user registration form accessible from
our website.
https://tmi.yokogawa.com/support/
Contact Us
If you want to resolve a technical support issue or need to contact YOKOGAWA,
please fill out the inquiry form on our website.
https://tmi.yokogawa.com/contact/
PIM 103-06E

i
IM 701930-01E
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.
List of Manuals
The following manuals are provided for the Current Probe (Model 701930).
Manual Title Manual Number Description
701930 Current Probe
User’s Manual
IM 701930-01E This manual
701930 Current Probe IM 701930-92 Document for China
701930 Current Probe IM 701930-93Z2 Document for Korea
Safety Instruction Manual IM 00C01C01-01Z1 Safety manual (European languages)
The “E”, “Z1” and “Z2” in the manual numbers are the language codes.
Contact information of Yokogawa offices worldwide is provided on the following
sheet.
Document Number Description
PIM 113-01Z2 List of worldwide contacts
Notes
• The contents of this manual are subject to change without prior notice
as a result of continuing improvements to the product’s performance and
functionality. The figures given in this manual may differ from those that
actually appear on your product.
• Every effort has been made in the preparation of this manual to ensure the
accuracy of its contents. However, should you have any questions or find any
errors, please contact your nearest YOKOGAWA dealer.
• Copying or reproducing all or any part of the contents of this manual without
the permission of YOKOGAWA is strictly prohibited.
Revisions
1st Edition: June 2001
2nd Edition: November 2005
3rd Edition: October 2013
4th Edition: October 2014
5th Edition: November 2015
6th Edition: January 2016
7th Edition: October 2017
8th Edition: June 2021
9th Edition: December 2021
9th Edition: December 2021 (YMI)
All Rights Reserved, Copyright © 2001 Yokogawa Electric Corporation
All Rights Reserved, Copyright © 2013 Yokogawa Test & Measurement Corporation

ii IM 701930-01E
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 701930) main body
Manuals 1 set
Carrying case
Safety Precautions
This instrument is designed to be used by a person with specialized knowledge.
This instrument meets the requirements of IEC-61010.
The general safety precautions described herein must be observed during
all phases of operation. If the instrument is used in a manner not specified
in this manual, the protection provided by the instrument may be impaired.
YOKOGAWA assumes no liability for the customer’s failure to comply with these
requirements. In addition, before using the probe, read the manuals of the
measuring instrument to thoroughly familiarize yourself with its specifications
and operation.
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.

iii
IM 701930-01E
Notes about Usage
WARNING
• Do not clamp bare conductors to avoid short circuits or personal injury
when the sensor head is open or measuring.
• Be careful not to damage the insulation surface of the conductor under
measurement.
• Connect the power supply to the probe power terminal (option) of a
waveform measuring instrument such as Yokogawa DL/DLM series, or
use the power supply 701934 or 700938.
• Be careful of electric shock when connecting the probe to the device
under measurement.
• Read and observe the safety precautions of the instruments to be
connected to.
• To avoid electric shock, do not get the instrument wet or use it with wet
hands.
French
AVERTISSEMENT
• Ne serrez pas les conducteurs nus pour éviter les courts-circuits ou
les blessures lorsque la tête du capteur est ouverte ou en mesure de
mesurer.
• Veillez à ne pas endommager la surface d’isolation du conducteur à
mesurer.
• Connectez l’alimentation à la borne d’alimentation de la sonde (option)
d’un instrument de mesure de forme d’onde tel que la série Yokogawa
DL/DLM, ou utilisez l’alimentation 701934 ou 700938.
• Faites attention aux chocs électriques lors de la connexion de la
sonde à l’appareil à mesurer.
• Lisez et respectez les consignes de sécurité des instruments auxquels
vous souhaitez vous connecter.
• Pour éviter les chocs électriques, ne mouillez pas l’instrument et ne
l’utilisez pas avec les mains mouillées.

iv IM 701930-01E
CAUTION
• Do not subject the instrument to vibrations or shocks when transporting
and handling it. Be especially careful to avoid dropping it.
• Do not store or operate the instrument in an environment with direct
sunlight, high temperature, high humidity, or condensation. The
instrument may be deformed, or deteriorated in insulation, and it may
not meet the specifications.
• Before using the instrument, inspect and check the operation for
malfunctions due to storage or transport conditions. If a malfunction is
found, contact your dealer or YOKOGAWA representative.
• The instrument is not dustproof or waterproof. Do not use it in a dusty or
wet environment.
• The sensor head is a precision assembly composed of a molded
component, a ferrite core and a Hall effect element. Handle the
instrument with care as it may be damaged by sudden changes in
ambient temperature, mechanical stress or shock.
• The matching surfaces of the sensor head are precision ground. Handle
the instrument with care as scratches on the surfaces may impair
performance.
• Gently wipe off any dust or dirt on the matching surfaces of the sensor
head with a soft cloth. It may generate resonance noise or impair
performance.
• Do not bend or pull the sensor cable or power cable to avoid damage
due to disconnection.
• Current sensors can be damaged by static electricity. Be careful not to
apply static electricity to the instrument including the following cases.
• Touching the sensor head with an object charged with static electricity
• Touching the sensor head with an object with an electrical potential
difference
• 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 the instrument with a soft cloth moistened with a small
amount of water or mild detergent. Do not use detergents containing
organic solvents such as benzine, alcohol, acetone, ethers, ketones,
thinners or gasoline. They may deform or discolor the instrument.
• When the power is on, keep the sensor head closed, except when
clamping the conductor under measurement. Leaving it open may
damage the instrument.

v
IM 701930-01E
French
ATTENTION
• Ne soumettez pas l’instrument à des vibrations ou à des chocs lors de
son transport et de sa manipulation. Faites particulièrement attention à
ne pas le laisser tomber.
• Ne stockez pas et n’utilisez pas l’instrument dans un environnement
exposé à la lumière directe du soleil, à une température élevée, à une
humidité élevée ou à la condensation. L’instrument peut être déformé
ou détérioré au niveau de l’isolation, et il peut ne pas répondre aux
spécifications.
• Avant d’utiliser l’instrument, inspectez et vérifiez que le fonctionnement
ne présente pas de dysfonctionnements dus aux conditions de stockage
ou de transport. En cas de dysfonctionnement, contactez votre
revendeur ou représentant YOKOGAWA.
• Cet instrument n’est pas étanche à la poussière ou à l’eau. Ne l’utilisez
pas dans un environnement poussiéreux ou humide.
• La tête de capteur est un assemblage de précision comprenant un
composant moulé, un noyau de ferrite et un élément à effet Hall.
Manipulez cet appareil avec précaution car il peut être endommagé par
des changements brusques de température ambiante, des contraintes
mécaniques ou des chocs.
• Les surfaces correspondantes de la tête du capteur sont rectifiées avec
précision. Manipulez l’instrument avec précaution, car les rayures sur
les surfaces peuvent altérer les performances.
• Essuyez délicatement la poussière ou la saleté sur les surfaces
correspondantes de la tête du capteur avec un chiffon doux. Cela peut
générer un bruit de résonance ou altérer les performances.
• Ne pliez pas et ne tirez pas sur le câble du capteur ou le câble
d’alimentation pour éviter les dommages dus à la déconnexion.
• Les capteurs de courant peuvent être endommagés par l’électricité
statique. Veillez à ne pas appliquer d’électricité statique à l’instrument, y
compris dans les cas suivants.
• Toucher la tête du capteur avec un objet chargé d’électricité statique
• Toucher la tête du capteur avec un objet présentant une différence de
potentiel électrique
• Un utilisateur chargé d’électricité statique touchant la surface du
noyau lors du nettoyage des surfaces correspondantes de la tête du
capteur
(Lors du nettoyage des surfaces, prenez des mesures contre
l’électricité statique telles que le port d’un bracelet antistatique.)

vi IM 701930-01E
• Essuyez doucement l’instrument avec un chiffon doux humidifié avec
une petite quantité d’eau ou de détergent doux. N’utilisez pas de
détergents contenant des solvants organiques tels que le benzène,
l’alcool, l’acétone, les éthers, les cétones, les diluants ou l’essence. Ils
peuvent déformer ou décolorer l’instrument.
• Lorsque l’appareil est sous tension, maintenez la tête du capteur
fermée, sauf lors du serrage du conducteur à mesurer. Le laisser ouvert
peut endommager l’instrument.
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.

vii
IM 701930-01E
Regulations and Sales in Various Countries and Regions
Waste Electrical and Electronic Equipment (WEEE)
(EU WEEE Directive valid only in the EEA* and UK WEEE
Regulation in the UK)
This product complies with the WEEE marking requirement. This
marking indicates that you must not discard this electrical/electronic
product in domestic household waste. When disposing of products
in the EEA or UK, contact your local Yokogawa office in the EEA or
UK respectively.
* EEA: European Economic Area
Authorized Representative in the EEA (AR)
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.
Disposal
When disposing of YOKOGAWA products, follow the laws and ordinances of the
country or region where the product will be disposed of.

viii IM 701930-01E
Conventions 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.
French
AVERTISSEMENT Attire l’attention sur des gestes ou des conditions susceptibles
de provoquer des blessures graves (voire mortelles), et sur les
précautions de sécurité pouvant prévenir de tels accidents.
ATTENTION Attire l’attention sur des gestes ou des conditions susceptibles
de provoquer des blessures légères ou d’endommager
l’instrument ou les données de l’utilisateur, et sur les
précautions de sécurité susceptibles de prévenir de tels
accidents.
Note Provides important information for the proper operation of the
instrument.

1
2
3
4
5
App
Index
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IM 701930-01E
Contents
List of Manuals................................................................................................................... i
Checking the Contents of the Package............................................................................. ii
Safety Precautions............................................................................................................ ii
Regulations and Sales in Various Countries and Regions.............................................. vii
Conventions Used in This Manual ..................................................................................viii
Chapter 1 701930 Current Probe
Product Overview...........................................................................................................1-1
Features.........................................................................................................................1-1
Names of Parts ..............................................................................................................1-2
Description of Parts........................................................................................................1-3
Operating Procedure......................................................................................................1-4
Handling Precautions..........................................................................................1-4
Preparations for Measurement ...........................................................................1-4
Demagnetizing and Zero Adjustment..................................................................1-5
Measurement Procedure ....................................................................................1-6
Specifications.................................................................................................................1-9
Product Specifications ........................................................................................1-9
Compliant Standards ........................................................................................1-10
Chapter 2 Malfunction? First, Investigate.
Corrective Action to be Taken in Case of an Abnormality ..............................................2-1

1-1
IM 701930-01E
1
2
3
4
5
App
Index
Chapter 1 701930 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 10 MHz
• Wide clamp permits measurement of high current levels
• Easy protect function during excessive input
701930 Current Probe

1-2 IM 701930-01E
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

1-3
IM 701930-01E
1
2
3
4
5
App
Index
Description of Parts
1 Clamp
The part which clamps to the conductor to be measured.
2 Clamp Lever
The lever for opening and closing the clamp. Make sure to open or close the
clamp only by using the clamp lever.
3 Clamp Lock
Locks the clamp in place when it is closed.
4 Sensor Head
This clamps the conductor being measured, and carries out the actual current
measurement. It 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.
5 Demagnetizing Switch (DEMAG)
If the core has been magnetized by switching the power ON and OFF,
or by an excessive input, this switch demagnetizes it. Always carry out
demagnetizing before measurement. The demagnetizing process takes about
three seconds. During demagnetizing, a demagnetizing waveform is output.
6 Zero Adjustment Dial (ZERO ADJ)
Use the zero adjustment dial to correct for the effect of a voltage offset or
temperature drift on the unit. When performing measurements, always carry
out a zero adjustment after demagnetizing.
7 Output Connector
The current waveform of the measured conductor is output at a constant rate
(0.01 VA in conjunction with the waveform measuring instrument with an input
impedance of 1 MΩ.)
Connect to the BNC input connector of the waveform measuring instrument.
Note
• The output of this unit is terminated internally. Use a high-impedance input to the
measuring instrument. With an input impedance of 50 Ω, accurate measurement
is not possible.
• If using BNC-banana plug or similar adapters to connect to input terminals other
than BNC connectors, make sure the polarity is correct.
• Turn the clamp lever until it clicks, and check that it is locked securely.
8 Power Plug
Connect the power plug to the receptacle on the power supply (model 701934
or 700938) to supply power to the sensor and terminator.
701930 Current Probe

1-4 IM 701930-01E
Operating Procedure
Handling Precautions
WARNING
• Do not clamp bare conductors to avoid short circuits or personal injury
when the sensor head is open or measuring.
• Be careful not to damage the insulation surface of the conductor under
measurement.
• Do not short-circuit between the two measurement lines with the metal
part of the sensor unit. It may lead to a serious accident such as the
occurrence of an arc.
• Connect the power supply to the probe power terminal (option) of a
waveform measuring instrument such as Yokogawa DL/DLM series, or
use the power supply 701934 or 700938.
• Be careful of electric shock when connecting the probe to the device
under measurement.
• Read and observe the safety precautions of the instruments to be
connected to.
• To avoid electric shock, do not get the instrument wet or use it with wet
hands.
Preparations for Measurement
CAUTION
When using a 701930 current probe, it may not be possible to use multiple
active probes at the same time with the 701934, 700938 power supply,
or the probe power supply from a YOKOGAWA waveform measuring
instrument. Make sure that the total current consumption of each active
probe does not exceed the current specifications of the probe power
supply. The current consumption of the probe depends on the measured
current (refer to the figure below).
See the following YOKOGAWA website for the usage limitations for each
measuring instrument.
https://tmi.yokogawa.com/solutions/products/oscilloscopes/current-probes/
Current to be measured (A)
Current Consumption (mA)
Current consumption* vs. current to be measured (typical)
* The sum total of a positive and negative current consumption.

1-5
IM 701930-01E
1
2
3
4
5
App
Index
1. Have the power supply 701934/700938, and oscilloscope or recorder for
waveform measurement ready.
2. Turn the power switch OFF and connect the power cord.
3. Connect the power plug of the 701930 to the power receptacle of the
701934/700938.
4. Turn the 701934/700938 power switch ON, and check that the front panel
power indicator lights.
Note
The output of this unit is terminated internally. Use a high-impedance input to the
measuring instrument. With an input impedance of 50 Ω, accurate measurement
is not possible. When power is supplied to the 701930, a demagnetizing waveform
might be generated.
Demagnetizing and Zero Adjustment
CAUTION
• When disconnecting the output connector, be sure to release the lock before
pulling the connector. Forcibly pulling the connector without releasing the lock,
or pulling on the cable will result in damage to the terminator.
• If using BNC-banana plug or similar adapters to connect to input terminals other
than BNC connectors, make sure the polarity is correct.
• Do not demagnetize when the clamp is connected to a conductor. Doing so
might damage the components of the circuit being measured.
• Do not begin supplying power to the 701930 after the clamp has been connected
to a conductor. Doing so might damage the components of the circuit being
measured.
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 instrument to DC.
3. Connect the output connector of the 701930 to the input connector of the
waveform measurement instrument. Turn the clamp lever until it clicks,
and check that it is locked securely.
701930 Current Probe

1-6 IM 701930-01E
4. Without clamping the conductor to be measured, press the clamp
lever until the LOCK indication appears (and the UNLOCK indication
disappears), and then check that the clamp is properly closed.
5. Press the demagnetizing switch (DEMAG) on the terminator.
6. Turn the zero adjustment dial on the terminator to adjust the trace to the
zero position.
Note
• The output of this unit is terminated internally. Use a high-impedance input to the
measuring instrument. With an input impedance of 50 Ω, accurate measurement
is not possible.
• Oscillation may occur when you execute DEMAG, but this has no effect on
measurements.
• The positive side of the waveform that is generated when you execute
DEMAG may not be symmetrical to the negative side, but this has no effect on
measurements.
Measurement Procedure
CAUTION
• The maximum continuous input range is based on heat that is internally
generated during measurement. Never input current in excess of this
level. Doing so may result in damage to the probe.
• The maximum continuous input range varies according to the frequency
of the current being measured. See page1-9, “Product Specifications.”
• If excess current is input, generated heat activates a built-in safety
function that blocks normal output. If this happens, remove the input
immediately (remove the sensor from the conductor being measured, or
reduce the input current to zero). Wait until the sensor has had sufficient
time to cool before resuming operation.
• Heat generated by an input current whose frequency is 1 kHz or higher
is mainly due to self-heating of the sensor head. In this case, the
protection function is not activated. Therefore, be careful of burns, short
circuits, and other accidents or sensor damage and the like caused by
the temperature increase.
• If you continuously input a current even if it is below the maximum
current value established by the maximum continuous input range,
the self-heating of the sensor may cause the safety function of the
instrument to activate in order to prevent damage to the instrument.
• At high ambient temperatures, the built-in safety circuit may activate at
current input levels below the rated continuous maximum.
• Continuous input of current exceeding the rated maximum, or repeated
activation of the safety function may result in damage to the unit.

1-7
IM 701930-01E
1
2
3
4
5
App
Index
• The probe is rated for maximum input under two conditions in addition to
the input maximums shown in the Product Specifications. These are: (1)
300 Apeak, for non-continuous input, and (2) 500 Apeak at Pulse Width
≤ 30 µs. (1) indicates an upper waveform response limit of 300 Apeak.
Use the sensor at RMS current input levels that are within the rated
continuous maximums. (2) indicates the upper response limit for a single
input pulse. Use the sensor at levels not exceeding this value.
• Open the clamp only by using clamp lever.
• To maintain the probe accuracy within the specifications and to verify
that correct measurement results are being obtained, periodic calibration
is necessary. The calibration period varies depending on your operating
environment and the frequency of use. We recommend that you set
a calibration period according to the frequency of use and ask us to
calibrate it periodically.
1. Check that the system is safe, and that the preparations described in the
preceding section have been carried out.
2. Pull the sensor opening lever so that the sensor head opens.
3. Align the sensor so that the current direction indication corresponds to
the direction of current flow through the conductor to be measured, and
clamp so that the conductor is in the center of the sensor aperture.
4. Press the clamp lever on the sensor head until the LOCK indicator
appears (and the UNLOCK indication disappears), and check that the
opening lever is firmly locked and the clamp is securely closed.
5. It is now possible to monitor the current waveform. The output voltage
rate of the 701930 is 0.01 V/A. Convert the voltage sensitivity of the
waveform observation instrument to current sensitivity. For example, if the
voltage sensitivity is 10 mV/DIV, the current sensitivity is 1 A/DIV.
Note
• The output of this unit is terminated internally. Use a waveform measurement
instrument with an input impedance of at least 1 MΩ.
• Immediately after powering on, this unit may be subject to an appreciable offset
drift due to the effect of self-heating. To counteract this, allow the unit to warm up
for about 30 minutes before carrying out measurement.
701930 Current Probe

1-8 IM 701930-01E
• When performing continuous measurements, be aware that the offset voltage
drifts depending on factors such as the ambient temperature.
• Under certain circumstances, oscillation may occur if the probe is connected to
the power supply 701934/700938 while the power supply is ON. In such cases,
oscillation can be stopped and operation restored to normal by opening and
closing the clamp with the clamp lever.
• Depending on the measured current value or its frequency, resonant sounds may
be generated from the clamp. This will have no effect on measurement.
• The reading may be affected by the position within the clamp aperture of the
conductor being measured. The conductor should be in the center of the clamp
aperture.
• When carrying out measurement, press the clamp lever until the LOCK indication
appears (and the UNLOCK indication disappears), and check that the clamp is
properly closed. If the clamp is not properly closed, accurate measurement will
not be possible.
• At high frequencies, common mode noise may affect measurements taken on
the high voltage side of circuits. If this occurs, reduce the frequency range of the
waveform measuring instrument, or clamp onto the low-voltage side of the circuit,
as appropriate.
Power source Load
H
L
• Directly after powering ON, the demagnetizing waveform appears in the output;
this is not a malfunction.
• Accurate measurement may be impossible in locations subject to strong external
magnetic fields such as transformers and high-current conductors, or in locations
subject to strong external electric fields such as radio transmission equipment.

1-9
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2
3
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5
App
Index
Specifications
Product Specifications
Accuracy is guaranteed at 23 ±3 °C after the power has been on for 30 minutes.
Frequency Band* DC to 10 MHz (–3 dB)
(Typical characteristics shown in the next page, Fig.1)
Rise Time* 35 ns or less
Maximum Continuous Input
150 A (Derating according to frequency shown in the next
page, Fig.2)
Maximum Peak Current
Non-Continuous 300 Apeak, or 500 Apeak at pulse width ≤
30 µs.
Output Voltage Rate* 0.01 V/A
Amplitude Accuracy* 0 to 150 A: ±1% of reading ±1 mV
150 A to 300 Apeak: ±2% of reading
(DC, 45 to 66 Hz)
Noise* Equivalent to 25 mArms or less
(for 20 MHz band measuring instrument)
Insertion Impedance (Typical characteristics shown in the next page, Fig.3)
Temperature Coefficient for Sensitivity*
±2% or less (with 55 Hz, 150 A input in a range of 0 to 40 °C)
Propagation Delay
40 ns (Typical)
Maximum Rated Power 5.5 VAmax (at the maximum continuous input)
Rated Supply Voltage ±12 V ±1 V
Operating Temperature and Humidity Range
0 to 40 °C, 80% RH or less (no condensation)
Storage Temperature and Humidity Range
–10 to 50 °C, 80% RH or less (no condensation)
Location for Use Indoor use, altitude up to 2000 m
Effect of External Magnetic Fields
Equivalent to a maximum of 150 mA
(in a DC or 60 Hz, 400 A/m magnetic field)
Measurable
Conductors
Insulated conductors
Diameter of Measurable Conductors
φ 20 mm
Guaranteed Accuracy Period
1 year (up to 10000 open and close operations)
Cable Lengths Sensor Cable: Approx. 2 m
Power Supply Cable: Approx. 1 m
External Dimensions Sensor:
Approx. 176 (W) × 69 (H) × 27 (D) mm
Terminator:
Approx. 27 (W) × 55 (H) × 18 (D) mm
Weight Approx. 500 g
Accessories User’s manual, carrying case
* In conjunction with a waveform measuring instrument with an input impedance of 1
MΩ ± 1%
701930 Current Probe