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