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 MN251T:
• Connect the BNC connector to your voltage-measuring instrument. The AC current probe has an output of
1mV/A. This means that for 200A AC in a conductor around which the probe is clamped, 200 mV 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 highest range and work down until
the appropriate range and resolution are reached. Clamp the probe around the conductor. Take the
reading on the meter and multiply it by 1000 to obtain the measured current (e.g, 150mV reading = 150 x
1000 = 150,000mA or 150A).
• 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
®
, Inc. d.b.a. AEMC
®
Instruments
(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:
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 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.
Please print the online Warranty Coverage Information for your records.
99-MAN 100455.v1 09/17
www.
.com
1.800.561.8187
