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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 MN254 and MN255
Connect the black lead of the current probe to "common" and the red lead to the AC voltage input on
your DMM or other voltage-measuring instrument. The AC current probe has an output of 10mV/A and
100mV/A. This means that with the probe in the 10 mV/A position, for 200A AC in a conductor around
which the probe is clamped, 2V AC will come out of the probe leads to your DMM or instrument. Select
the range which corresponds to the measured current. If the current magnitude is unknown, start with
the probe in the 10mV/A position and if the current is < 20 amps the probe can be switched to the 100
mV/A position for the higher resolution. Clamp the probe around the conductor. With the probe in the
10 mV/A position take the reading on the meter and multiply it by 100 to obtain the measured current
(e.g, 160mV reading = 160 x 100 = 16,000mA or 16A).
For best accuracy, 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. Contaminants 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 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
Cleaning
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. To clean the probe jaws, use 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
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 two years from the date of original pur-
chase against defects in manufacture. This limited warranty is given by AEMC
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
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, not
®
Instruments.
99-MAN 100141.v8 03/18
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