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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 MN379T
• Connect the BNC connector to your voltage-measuring instrument. The AC current probe has an output
of 200mV/A and 10mV/A. This means that with the probe in the 10mV/A position, for 100A AC in a
conductor around which the probe is clamped, 1V AC will come out of the probe leads to your
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 < 5 amps the probe can be
switched to the 200mV/A position for the higher resolution. Clamp the probe around the conductor. With
the probe in the 10mV/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).
• The 5A range is design to measure on 5A current transformer. The output is 1V rms for 5A measured.
Enter a scale factor in the meter if possible for direct reading.
• 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.
(Or contact your authorized distributor)
NOTE: All customers must obtain a CSA# before returning any instrument.
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
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
Please print the online Warranty Coverage Information for your records.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
®
TestEquipmentDepot.com
®
Instruments, not by the
Instruments.
99-MAN 100478.v1 7/18
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