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AC Current Probe
Model JM875
User Manual
DESCRIPTION
The JM875 (Catalog #2110.89) is designed for use in industrial environments. The “squared” jaws permit
multiple conductor or bus bar positioning. The voltage output makes it the perfect tool for measurement
with DMMs, recorders, power and harmonic meters. Three ranges allow you to obtain the best resolution
even on low current measurement. The Model JM875 is compatible with any AC voltmeter, multimeter, or
other voltage measuring instrument with an input impedance greater than 1 M. To achieve the stated
accuracy, use the JM875 with a voltmeter having an accuracy of 0.75%.
WARNING
These safety warnings are provided to ensure the safety of personnel and proper operation of the
instrument.
• Read the instruction manual completely and follow all the safety information before attempting
to use or service this instrument.
• Use caution on any circuit: Potentially high voltages and currents may be present and may
pose a shock hazard.
• Read the Safety Specifications section prior to using the current probe. Never exceed the
maximum voltage ratings given.
• Safety is the responsibility of the operator.
• ALWAYS connect the current probe to the display device before clamping the probe onto the
sample being tested.
• ALWAYS inspect the instrument, probe, probe cable, and output terminals prior to use. Replace
any defective parts immediately.
• NEVER use the current probe on electrical conductors rated above 600 V in overvoltage
category III (CAT III). Use extreme caution when clamping around bare conductors or bus bars.
INTERNATIONAL ELECTRICAL SYMBOLS
This symbol signifies that the current probe is protected by double or reinforced insulation. Use
only factory specified replacement parts when servicing the instrument.
This symbol signifies CAUTION! and requests that the user refer to the user manual before
using the instrument.
This is a type A current sensor. This symbol signifies that application around and removal
from HAZARDOUS LIVE conductors is permitted.
DEFINITION OF MEASUREMENT CATEGORIES
Cat. II: For measurements performed on circuits directly connected to the electrical distribution system.
Examples are measurements on household appliances or portable tools.
Cat. III: For measurements performed in the building installation at the distribution level such as on
hardwired equipment in fixed installation and circuit breakers.
Cat. IV: For measurements performed at the primary electrical supply (<1000V) such as on primary
overcurrent protection devices, ripple control units, or meters.
RECEIVING YOUR SHIPMENT
Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify
your distributor of any missing items. If the equipment appears to be damaged, file a claim immediately
with the carrier and notify your distributor at once, giving a detailed description of any damage.
®
INSTRUMENTS
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4.72"
(120 mm)
Ø=2.52" (64 mm)
Cable max.
1.97 x 5.31" (50 x 135 mm) or
2.52 x 3.94" (64 x 100 mm)
Bus Bar max.
Red Black
P1 P2
1.89"
(48 mm)
12.40"
(315 mm)
S2S1
ELECTRICAL SPECIFICATIONS
Current Range:
100mA to 30A AC continuous cycle
1 to 300A AC continuous cycle
1 to 2000A AC continuous cycle for the
full temperature range
(2800 A if temperature is < 35°C or 95°F)
Output Signal:
100mV AC/A AC (3V at 30A) 90A peak
10mV AC/A AC (3V at 300A) 900A peak
1mV AC/A AC (3V at 3000A) 9000A peak
Accuracy and Phase Shift*:
30A RANGE
Primary current 1.5A 6A 30A
Accuracy % 2% ± 10mV (0.5A)
Phase shift 15° 7° 5°
Probe Impedance: 1000Ω
300A RANGE
Primary current 15A 60A 300A
Accuracy % 2% ± 2mV (0.2mA)
Phase shift 3° 1.5° 1°
Probe Impedance: 100Ω
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3000A RANGE
current 150A 600A 3000A
Primary
Accuracy % 2% ± 0.5 mV
Phase shift 1.5° 1° 0.5°
Probe Impedance: 10
(*Reference conditions: 23°C±3°K, 20 to 85%
RH, 48 to 65 Hz, external magnetic field < 40
A/m, no DC component, no external current
carrying conductor, test sample centered.)
Load impedance ≥ 1 M.
Overload: 3200 A during 5 mn
Accuracy: Per IEC 185-26-27
Ampere Second Product: 100 A.s
dV/Dt: 100 mV AC/A AC: dV/Dt = 400 mV/µs
10 mV AC/A AC: dV/Dt = 50 mV/µs
1 mV AC/A AC: dV/Dt - 5 mV/µs
Frequency Range: 30Hz to 5kHz; current
derating above 200Hz on the 3000A range
Load Impedance: > 100k
Working Voltage: 600V AC
Common Mode Voltage: 600V AC
Open Secondary Voltage: 10V Max.
Influence of Adjacent Conductor:
0.005A/A AC
Influence of Conductor in Jaw Opening:
1.5% of reading
Influence of Frequency from 30Hz to 5kHz:
± 6% on all ranges
Influence of DC Current: 0.05% per A DC
MECHANICAL SPECIFICATIONS
Operating Temp.: 14° to 122°F (-10° to 50°C)
Storage Temp.: -40° to 185°F (-40° to 85°C)
Influence of Temperature: < 0.1% per 10°K
Jaw Opening: 3.54" (90mm)
Maximum Conductor Size:
Cable: 2.52" max. (64mm)
Bus bar: 1.97 x 5.31" (50 x 135mm)
2.52 x 3.94" (64 x 100mm)
Envelope Protection: IP 20 (IEC 529)
Drop Test: 500mm (IEC 68-2-32)
Mechanical Shock: 100 g (IEC 68-2-27)
Vibration: 10/55/10Hz, 0.15 mm (IEC 68-2-6)
Polycarbonate Material:
Handles: 10% fiberglass charged
polycarbonate UL 94 V0
Jaws: ABS UL 94 V2
Dimensions:
4.72 x 12.40 x 1.89" (120 x 315 x 48 mm)
Weight: 2.65 lbs. (1200 g)
Colors: Dark gray handles with red jaws
Output:
Two standard safety banana jacks (4 mm)
SAFETY SPECIFICATIONS
Electrical:
Double insulation or reinforced insulation between
primary or secondary and outer case of handle
upon IEC 1010-2-32
Common Mode Voltage:
600V Category III, Pollution: 2
ORDERING INFORMATION
Current Probe JM875 ........................ Cat #2110.89
Accessories:
Leads, set of 2, 5 ft. safety (1000V) .... Cat #2111.29
Lead No. 211 for Probe 5 A Series ..... Cat #2950.06
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OPERATION
Please make sure that you have already read and fully understand the WARNING section on page 1.
Making Measurements with the AC Current Probe Model JM875
• Connect the black and red terminals to the Volt AC range of y
our DMM or voltage measuring
instrument.
Select the appropriate voltage range. If the current magnitude is unknown, select the highest range
(3000A AC / 3V AC) on the switch probe located inside the handle. Clamp the probe around the
conductor to be tested. If the reading is less than 300mV or 30mV, select the lower range until you
obtain the best resolution. Read the value display on the DMM (in mV) and divide it by the range
selected. (If reading = 2.59V on the 10mV AC/A AC range, the current flowing through the probe is
2590mV ÷ 10 = 259A AC).
• For best accuracy
other conductors w
: carefully center the conductor inside the probe jaw, avoid if possible, the proximity
hich may create noise.
of
Tips for Making Precise Measurements
• W
hen using a current probe with a meter, it is important to select the range that prov
resolution. F
• Make sure that probe jaw
gaps betw
pow
ailure to do this may result in measurement errors.
mating surfaces are free of dust and contamination.
een the jaws, increasing the phase shift between primary and secondary. It is very
er measurement.
Contaminants cause air
ides the best
critical for
MAINTENANCE:
Warning
• For maintenance use only original factory replacement parts.
• To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so.
• To avoid electrical shock and/or damage to the instrument, do not get water or other foreign agents
into the probe.
To ensure optimum performance, it is important to keep the probe jaw mating surfaces clean at all times.
Failure to do so may result in error in readings. The following is the recommended procedure for cleaning
the probe jaws: Use a very fine sand paper (fine 600) to avoid scratching the jaw, then gently clean with a
soft oiled cloth.
REPAIR AND CALIBRATION
You must contact our Service Center for a Customer Service Authorization number (CSA#). This will
ensure that when your instrument arrives, it will be tracked and processed promptly. Please write the CSA#
on the outside of the shipping container.
Chauvin Arnoux
®
, Inc. d.b.a. AEMC® Instruments
15 Faraday Drive Dover, NH 03820 USA
(800) 945-2362 (Ext. 360) • (603) 749-6434 (Ext. 360) • repair@aemc.com
(Or contact your authorized distributor)
NOTE: All customers must obtain a CSA# before returning any instrument.
TECHNICAL AND SALES ASSISTANCE
If you are experiencing any technical problems, or require any assistance with the proper use or
application of this instrument, please contact our technical hotline:
(800) 945-2362 (Ext. 351) • (603) 749-6434 (Ext. 351) • techsupport@aemc.com
LIMITED WARRANTY
The current probe is warranted to the owner for a period of 2 years from the date of original purchase
against defects in manufacture. This limited warranty is given by AEMC® Instruments, not by
the distributor from whom it was purchased. This warranty is void if the unit has been tampered with,
abused or if the defect is related to service not performed by AEMC® Instruments.
Full warranty coverage and product registration is availabl e on our website at:
www.aemc.com/warranty.html.
Please print the online Warranty Coverage Information for your records.
99-MAN 100103.v6 02/18
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