IM 751552-01E 1/2
The Clamp-on Probe (751552) is a product of Yokogawa Test & Measurement Corporation.
Contact information of Yokogawa oces worldwide is provided on the following sheet.
Document No. Description
PIM 113-01Z2 List of worldwide contacts
Safety Precautions
This product is designed to be used by a person with specialized knowledge.
Make sure to observe the following safety precautions when handling the probe. YOKOGAWA
assumes no liability for the customer’s failure to comply with these safety precautions. Before you
use the probe, read the measuring instrument’s manual to thoroughly familiarize yourself with the
specications and operations of the measuring instrument.
This manual is an essential part of the product; keep it in a safe place for future reference.
The following safety markings are used in this manual.
This instrument is protected by double-layer insulation or reinforced insulation that has the same level
of protection as double-layer insulation. It is not necessary to connect the instrument to protective
ground for safe use.
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.”
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.
Note Provides important information for the proper operation of the instrument.
WARNING
• Do not exceed the maximum current. Doing so can result in erroneous measurement
or damage to the instrument.
• Beware of electric shock.
• Do not exceed 600 V, and do not use with a non-isolated conductor with a surge
exceeding measurement category III. Be sure to check the electric potential and
voltage surge before measurement.
• Do not perform measurement if the instrument is damaged.
• Always use the instrument indoors. Do not use the instrument in a rainy or humid
environment, or if water droplets form on its surface. Also, do not operate with wet
hands. Condensation may appear if sudden changes in temperature occur. If this
happens, let the device acclimatize to the new temperatures for at least one hour, then
refrain from using the device until conrming that there is no condensation.
• Always operate the instrument in the environmental conditions described in this manual.
• Always keep the clamp lever clean.
• Do not disassemble the device
The device should be disassembled by qualied personnel only.
1. Description
This device is a current output type clamp-on probe with a 1000:1 current transformation ratio that
performs transformation on the primary current.
2. Contents of the Package
Check that the model name given on the name plate on the grip match those on your order.
XXXXXXXX
751552
XXXXXXXX
751552
Standard Accessories
Manuals
Manual Title Manual No. Description
751552 CLAMP-ON PROBE
User’s Manual
IM 751552-01E
This manual. This manual explains the
handling precautions, basic
usage, and specifications of the probe.
751552 CLAMP-ON PROBE IM 751552-01
The Japanese version of the above manual
751552 CLAMP-ON PROBE IM 751552-92 Document for China
751552 CLAMP-ON PROBE IM 751552-93Z2 Document for Republic of Korea
Safety Instruction Manual IM 00C01C01-01Z1 Safety manual (European languages)
Inquiries PIM 113-01Z2 List of worldwide contacts
The “E” in the manual number is the language code.
Accessories (Sold Separately)
The optional accessories below are available for purchase separately. Use the accessories
specied in this manual. Moreover, use the accessories of this product only with Yokogawa
products that specify them as accessories.
758917
758921
Name
Measuring
Lead
Model
758917
Lot Qty.
1
Notes
2 pcs. per unit
Used in conjunction with the
adapter, model 758921, sold
separately
Length: 0.75 m, Rated Current: 32 A
Fork
Terminal
Adapter
Set
758921 1 2 pcs. per unit
For measuring leads, model
758917, sold separately
Rated Current: 25 A
3. Names of Parts
Name plate
(Opens and closes)
Jaws
Feed-through
hole
(for conductor)
Clamp lever
Direction of current
flowing through conductor
The direction of current flow
from the output terminal
Output terminals: Φ4 mm socket
Correct Use of Clamp
Incorrect Use of Clamp
Direction of current flow
Conductor
Using an Earth-Shielded
Conductor
Using Two Parallel
Conductors
Barrier
4. Performing Measurement
WARNING
Keep your ngers and hands behind the barrier.
CAUTION
Ensure that the current owing through the conductor being measured is within the
current range. If the current range is exceeded, the device may overheat and become
damaged.
Operating Procedure
1. Enter the appropriate settings on the measuring instrument being used to accommodate the
output from the probe.
2. Connect measuring leads (758917, sold separately) to the probe's output terminals and the
measuring instrument. The connection method diers depending on the measuring instrument
being used. See your instrument's user's manual for the procedure. If the connector on the
measuring leads cannot be connected to the input terminals on the measuring instrument, use
a fork terminal (758921: sold separately) or other adapter.
Example • For a digital power meter, connect a lead from the red output terminal (+) to
the current input I terminal, and from the black output terminal (-) to the current
± terminal.
• For a digital multimeter, connect a lead from the red output terminal (+) to the
A terminal, and from the black output terminal (-) to the Lo terminal.
3. Squeeze the jaws to open the clamps, then position the conductor inside the feed-through
hole. Hold the probe so that the conductor is as closely in the center of the feed through hole
as possible.
4. Release the clamp lever to close the clamps. Steps 3 and 4 is called clamping.
5. Read the measured values on the measuring instrument. Calculate the current owing
through the conductor using an input/output ratio of 1000:1.
Example: Given that 150.0 mA is owing from the probe's output terminal,
current = 150.0 mA × 1000 = 150.0 A.
Note
• Close the clamp completely before taking measurements. Errors can occur If any foreign
objects or particles become trapped between the jaws.
• Only perform measurements on conductors in which the current is flowing in only one
direction. The device cannot correctly measure earth-shielded conductors or parallel
conductors with current owing in both directions.
• To reduce errors, use a measuring instrument with an internal impedance less than or equal to 1Ω.
• If DC current is superimposed on an AC current being measured, the output signal from the
clamp will become distorted and measurements will be inaccurate.
• When measuring phase dierence in voltage and current using an instrument such as a digital
power meter, make sure that the current ows in the same direction as the arrows on the probe.
The phase dierence can be correctly measured by positioning the clamp so that current ows
from the front side (name plate) to the reverse side (in the direction shown by the arrows on the jaws).
• Avoid locations with extremely strong external magnetic fields (other than the conductor
under test) as they may cause measurement errors.
5. Specications
Safety Standards Complying standard: EN61010-1 & EN61010-2-032
Instrument with double insulation or reinforced insulation between primary, secondary
and outer case parts.
Operating voltage: 600 V Measurement category III1, Pollution degree 22.
Operating voltage: 300 V Measurement category IV1, Pollution degree 22.
Electromagnetic compatibility Complying standard: EN61326-1
Environmental standards
3
EU RoHS Directive compliant
Current Range AC 0.001 to 1200 Arms. However, for 1000 to 1200 Arms, refer to the Maximum Current
Current Transformation Ratio 1000:1
Output Signal AC 1 mA/A (or 1 A/1000 A)
Accuracy and Phase shift (at Reference Conditions4)
PrimaryCurrentI 1≤I<100mA 0.1≤I<1A 1≤I<10A 10≤I<100A 100≤I≤1200A
%accuracyof ≤3%ofrdg+5µA ≤2%ofrdg+3µA ≤1%ofrdg ≤0.5%ofrdg ≤0.3%ofrdg
output signal (rdg: reading of output signal)
Phase shift Notspecied Notspecied ≤2deg ≤1deg ≤0.7 deg
Bandwidth 30 Hz to 5 kHz (error in frequency inuence is added to Accuracy at Reference Conditions).
Crest Factor 6 or less for a 2000 A peak (333 Arms) current or less
Maximum Current For a continuous frequency f of 1 kHz or less, I ≤ 1000 A
For frequencies exceeding 1 kHz, the current that can be allowed to ow continuously
(Ipermanent) is calculated as follows:
Ipermanent = 1000A/f(kHz)
For an input signal of 1000 A < I ≤ 1200 A at 1 kHz, the probe can be used continuously
for a maximum of 40 minutes. Do not perform measurements 20 minutes thereafter
User's
Manual
751552
CLAMP-ON PROBE
IM 751552-01E
9th Edition
Thank you for purchasing the CLAMP-ON PROBE (Model 751552). In order to take advantage of all the
functions of the probe and to ensure proper use, please read this user's manual thoroughly before
beginning operation. Please familiarize yourself with the functions and characteristics of the probe prior
to operation. After reading this manual, keep it in a safe place.
9th Edition : February 2022 (YMI). All Rights Reserved. Copyright © 2002. Yokogawa Electric Corporation. Copyright © 2014 Yokogawa Test & Measurement Corporation. Printed in Japan
*IM 751552-01E/9*
