AEMC instruments MN375 User manual

AC Current Probe
Model MN375
User Manual
DESCRIPTION
The MN375 (Cat. #2115.41) is the latest in compact AC current probes. Designed to meet the most
stringent demands in industry and electrical contracting, it also meets the latest safety and performance
standards. This probe has a measurement range up to 10 Arms and is compatible with any AC voltmeter,
multimeter, or other voltage measurement instrument that has the following features: Range and
resolution capable of displaying 100 mV of output per amp of measured current; Voltmeter accuracy of

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.
• 

• 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.
• 
when clamping around bare conductors or bus bars.
INTERNATIONAL ELECTRICAL SYMBOLS
  
  
instrument.
Thi  
before using the instrument.
T 
 
DEFINITION OF MEASUREMENT CATEGORIES (CAT)
CAT IV corresponds to measurements performed at the primary electrical supply (< 1000 V).
Example: primary overcurrent protection devices, ripple control units, and meters.
CAT III corresponds to measurements performed in the building installation at the distribution level.
Example: hardwired equipment in xed installation and circuit breakers.
CAT II corresponds to measurements performed on circuits directly connected to the electrical
distribution system.
Example: measurements on household appliances and portable tools.
RECEIVING YOUR SHIPMENT
Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify

with the carrier and notify your distributor at once, giving a detailed description of any damage.

ELECTRICAL SPECIFICATIONS
Nominal Range: 10 A
Measurement Range: 0.1 to 10 A
Transformation Ratio: Voltage output
Output Signal: 100 mV/A (1 V at 10 A)
Accuracy and Phase Shift*:
Accuracy Shift:
0.1 to 1 A: 1 % Reading ± 2 mV
1 to 10 A: 1 % Reading ± 1.5 mV
Phase Shift::





-
rent carrying conductor, test sample centered.)

Frequency Range: (40 to 3) kHz
Limit Operating Conditions:
20 A permanently to 1 kHz
Crest Factor:

Working Voltage:

Common Mode Voltage:

Inuence of Adjacent Conductor:
< 15 mA/A at 50 Hz
Inuence of DC on AC signal:
DC Current < 20 A, < 5 %
Inuence of Conductor Position in Jaw:

Inuence of Frequency:
40 Hz to 1 kHz: 3 % of mV output
1 kHz to 3 kHz: 10 % of mV output

Inuence of Temperature:

Inuence of Humidity (10 - 90 % RH):

MECHANICAL SPECIFICATIONS
Operating Temperature:

Storage Temperature:

Operating Relative Humidity:

󰀨
Maximum Cable Diameter:

Cable Protection:

Drop Test:


Mechanical Shock:

Vibration:

Dimensions:

Weight:

Polycarbonate Material:

 

Opening Operations - Life:
> 50,000
Output:
Double/reinforced insulated 5 ft (1.5 m) lead with
safety 4 mm banana plug
SAFETY SPECIFICATIONS
Electrical:
Double insulation or reinforced insulation between
the primary or secondary and the outer case of the

Pollution Degree 2.
Common Mode Voltage:

Electromagnetic Compatibility:
Emission and immunity in an industrial environ-

ORDERING INFORMATION
AC Current Probe MN375.......Cat #2115.41
Accessories:
Banana plug adapter
(to nonrecessed plug) ............Cat #1017.45
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 MN375.
• 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
100mV/A. This means that for 10A AC in a conductor around which the probe is clamped, 1 V 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 10 to obtain the measured current

• 
Tips for Making Precise Measurements
• When using a current probe with a meter, it is important to select the range that provides the best

• 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
■
■To avoid electrical shock, do not attempt to perform any servicing unless you are

■To avoid electrical shock and/or damage to the instrument, do not allow water or other
foreign agents to come into contact with the probe.
Cleaning:
■To ensure optimum performance, it is important to keep the probe jaw mating surfaces


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.
 ®, Inc. d.b.a. AEMC®Instruments
 
 
(Or contact your authorized distributor)
NOTE: You must obtain a CSA# before returning any instrument.
TECHNICAL AND SALES ASSISTANCE

use or application of this instrument, please contact our technical hotline.

LIMITED WARRANTY
The instrument is warrantied 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.
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.
