Aemc instruments JM835A User Manual

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 JM835A

• Connect the black and red terminals to the Ampere AC range of your DMM or current measuring
instrument. Select the appropriate current range (5A AC). Clam p the probe around the conductor to be
tested. If the reading is less than 2 A, select the lower range until you obtain the best resolution. Read the
value display on the DMM and multiply it by the probe ratio (3000/5 = 600). (If reading = 0.592A AC, the
current flowing through the probe is 0.592 A x 600 = 355.2 A).

• For best accuracy: carefully center the conductor inside the probe jaw, avoid if possible, the proximity of
other conductors which may create noise.

Tips for Making Precise Measurements

• When using a current probe with a meter, it is important to select the range that provides the best
resolution. Failure to do this may result in measurement errors.

• Make sure that probe jaw mating surfaces are free of dust and contamination. Contam inants cause air
gaps between the jaws, increasing the phase shift between primary and secondary. It is very critical for
power measurement.

MAINTENANCE:

Warning

• For maintenance use only original 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 t o the instrument, do not get water or other foreign agents into
the probe.

Cleaning

To ensure optimum performance, i t is important to keep the probe j aw mating surfaces clean at all tim es.
Failure to do so may result in error in readings. To clean the probe jaws use a very fine sand paper (fine

600) to avoid scratching the jaw, then gently clean with a soft, oil cloth.

REPAIR AND CALIBRATIO N

You must contact our Service Center for a Customer Servic e 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

15 Faraday Drive • Dover, NH 03820 USA

[phone] (Ext. 360) • [phone] (Ext. 360) • [e-mail]

(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:

[phone] (Ext. 351) • [phone] (Ext. 351) • [e-mail]

LIMITED WARRANTY

The current probe is warranted to the owner for a period of two years from the date of original purchase
against defects in manufacture. This lim ited warranty is given by AEMC
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

Full warranty coverage and product registration is available on our website at:
www.aemc.com/warranty.html.

Please print the online Warranty Coverage Information for your records.

®

, Inc. d.b.a. AEMC® Instruments

®

Instruments.

®

Instruments, not by the distributor

AC Current Probe
Model JM835A

User Manual

DESCRIPTION

The JM835A (Catalog #2110.84) is designed for use in industrial environments. The “squared” jaws permit
multiple conductor or bus bar positioning. The current output m akes it the perfect tool for measurement
with DMMs, recorders, power and harmonic meters. The Model JM835A is compatible with any AC
Ammeter, multim eter, or other current measuri ng instrument with an input impedance lower than 1Ω. To
achieve the stated accuracy, use the JM835A with the DMM 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 c urrent probe to the display device before cl amping the probe onto the
sample being tested.

• ALWAYS inspect the instrument, probe, probe cable, and output termi nals prior to use. Replace
any defective parts immediately.

• NEVER use the current probe on electrical conductors rated above 600V 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. IV: For measurements performed at the primary electrical supply (<1000V) such as on primary

overcurrent protection devices, ripple control units, or meters.

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. II: For measurements performed on circuits directly connected to the electrical distribution system.

Examples are measurements on household appliances or portable tools.

RECEIVING YOUR SHIPMENT

Upon receiving your shipment, m ake s ure that the contents are consistent with the packing l ist. Notify your
distributor of any missing items. If the equipment appears to be damaged, file a c laim i mm ediately with the
carrier and notify your distributor at once, giving a detailed description of any damage.

99-MAN 100077.v8 02/18

Primary current

150A

600A

3000A

Accuracy %

3%

1.5%

1%

Phase shift

3°

1.5°

1°

ELECTRICAL SPECIFICATIONS

Current Range:

1 to 2400A AC, continuous cycle for
the full temperature range
(3000A if temperature < 35°C or 95°F)

Transformation Ratio:

3000:5

Output Signal:

1.666 mA AC/A AC (5A at 3000A)

Accuracy and Phase Shift*:

(*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 0.2Ω.

Overload: 3600A during 10 mn
Accuracy: Per IEC 185-26-27

Class 1 (5 VA) from 48 to 1000 Hz

Open Secondary Voltage:

< 42V by limiting circuit

Frequency Range:

30 Hz to 5 kHz; current derating above
1 kHz for continuous use

Load Impedance: ≤ 1Ω
Working Voltage: 600V AC
Common Mode Voltage: 600V AC
Influence of Adjacent Conductor:

0.005A/A AC

Influence of Conductor in Jaw Opening:

1% ± 0.1A of reading

MECHANICAL SPECIFICATIONS

Operating Temperature:

14° to 122°F (-10° to 50°C)

Storage Temperature:

-13° to 176°F (-25° to 80°C)

Influence of Temperature:

< 0.1% per 10°K

Jaw Opening: 3.54" (90 mm)
Maximum Conductor Size:

Cable: 2.52" Ø max. (64mm)
Bus bar: 1.97 x 5.31" (50 x 135 mm)

2.52 x 3.94" (64 x 100 mm)

Envelope Protection:

IP 20 (IEC 529)

Drop Test:

500 mm (IEC 68-2-32)

Mechanical Shock:

100 g (IEC 68-2-27)

Vibration:

10/55/10 Hz, 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:

5 ft (1.5m) lead with safety 4mm banana plug

SAFETY SPECIFICATIONS

Electrical:

Double insulation or reinforced insulation between
primary or secondary and outer case of handle
upon IEC 1010

Common Mode Voltage:

- 600V Category III, Pollution: 2

- 300V Category IV, Pollution: 2

Electromagnetic Compatibility:

EN 50081-1 Class B
EN 50082-2 Electrostatic discharge
IEC 1000-4-2
Radiated field IEC 1000-4-3
Fast transients IEC 1000-4-4
Magnetic field at 50/60 Hz IEC 1000-4-8

ORDERING INFORMATION

Current Probe JM835A .................. Cat #2110.84

Includes a user manual and a product warranty
and registration card.

Accessories:

Banana plug adapter

(to non-recessed plug) ..................... Cat #1017.45