AEMC MN375 Operating Manual

AC Current Probe
Model MN375

User Manual

DESCRIPTION

The MN375 (Catalog #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 10Arms and is compatible with any AC
voltmeter, multimeter, or other voltage measurement instrument that has the following features: Range
and resolution capable of displaying 100mV of output per amp of measured current; Voltmeter accuracy
of 0.75% or better to take full advantage of the accuracy of the probe; Input impedance of ≥ 1MΩ

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 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 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.

• 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. I: For measurements on circuits not directly connected to the AC supply wall outlet such as

protected secondaries, signal level, and limited energy circuits.

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

Examples are measurements on household appliances or portable tools.

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. IV: For measurements performed at the primary electrical supply (<1000V) such as on primary

overcurrent protection devices, ripple control units, or meters.

RECEIVING YOUR SHIPMENT

Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify
your distributor of any missing items. If the equipment appears to be damaged, file a claim immediately
with the carrier and notify your distributor at once, giving a detailed description of any damage.

5.47"

(139 mm)

.73"

(18.5 mm)

Black

Red

2.56"

(65 mm)

.83"

(21 mm)

2.00"

(51 mm)

ELECTRICAL SPECIFICATIONS

Nominal Range: 10A
Measurement Range: 0.1 to 10A
Transformation Ratio: Voltage output
Output Signal: 100mV/A (1 V at 10A AC)
Accuracy and Phase Shift*:

Accuracy:

0.1 to 1A: 1% Reading ± 2mV
1 to 10A: 1% Reading ± 1.5mV

.1.18"

(30 mm)

Phase Shift:

1 to 5A: ≤ 1° @ 60 Hz
5 to 10A: ≤ 1.5° @ 60 Hz

(*Reference conditions: 20°C to 26°C, 20 to 75% RH,
external magnetic field <40 A/m, 48 to 65 Hz sine wave,
distortion factor less than 1%, no DC component, no
external current carrying conductor, test sample centered.)
Load impedance > 1MΩ.

Frequency Range: 40 to 3kHz
Limit Operating Conditions:

20A permanently to 1kHz

Crest Factor:

3 @ 10 Arms with an error (due to CF) of 3%

Working Voltage:

600Vrms

Common Mode Voltage:

600Vrms

Influence of Adjacent Conductor:

< 15mA/A at 50 Hz

Influence of DC on AC signal:

DC Current < 20A, < 5%

Influence of Conductor Position in Jaw:

0.5% of mV output @ 50/60 Hz

Influence of Frequency:

40 Hz to 1 kHz: 3% of mV output
1 kHz to 3 kHz: 10% of mV output

Influence of Temperature:

≤ 150 ppm/°K, or 0.15% of mV output per 10°K

Influence of Humidity (10 - 90% RH):

≤ 0.2% of mV output per 10°K @ 18°C to 28°C

MECHANICAL SPECIFICATIONS

Operating Temperature:

14° to 131°F (-10° to +55°C)

Storage Temperature:

-40° to 158°F (-40° to +70°C)

Operating Relative Humidity:

10-35°C 85% RH
(without roll-off above 35°C)

Maximum Cable Diameter:

One Ø 0.78” (20 mm), bus bar 20 x 5 mm

Case Protection:

IP 40 (IEC 529)

Drop Test:

Test per IEC 68-2-32:

1.0 m drop on 38 mm of Oak on concrete.

Mechanical Shock:

Test per IEC 68-2-27

Vibration:

Test per IEC 68-2-6

Dimensions:

5.47 x 2.00 x 1.18" (139 x 51 x 30 mm)

Weight:

180 g (6.5 oz)

Polycarbonate Material:

Jaws: Polycarbonate with 10% fiberglass charge,
Red UL 94 V0
Case: Polycarbonate 920A Gray

Opening Operations - Life:

> 50,000

Output:

Double/reinforced insulated 5 ft (1.5m) lead with
safety 4mm banana plug

SAFETY SPECIFICATIONS

Electrical:

Double insulation or reinforced insulation between
the primary or secondary and the outer case of the
handle conforms to IEC 1010-2-32.
600V, Category III, Pollution Degree 2

Common Mode Voltage:

600V

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

E192383

ORDERING INFORMATION

AC Current Probe MN375................. Cat #2115.41

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

Accessories:

Banana plug adapter

(to non-recessed 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, 1V 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 (e.g, 160mV reading = 160 x
10 = 1,600mA or 1.6A).

• 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. If the instrument is returned for calibration, we need to know if you
want a standard calibration, or a calibration traceable to N.I.S.T. (includes calibration certificate plus
recorded calibration data).

Chauvin Arnoux

15 Faraday Drive • Dover, NH 03820 USA

Tel: [phone] (Ext. 360)
[phone] (Ext. 360)
Fax: [phone] or [phone]

[e-mail]
(Or contact your authorized distributor)

Costs for repair, standard calibration, and calibration traceable to N.I.S.T. are available.

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 call our technical hotline:

[phone] • [phone] • Fax [phone]
Chauvin Arnoux

[e-mail]
www.aemc.com

®

, Inc. d.b.a. AEMC® Instruments

®

, Inc. d.b.a. AEMC® Instruments

99-MAN 100216.v6 04/07