Aemc instruments MN291 User Manual

AC Current Probe
Models MN291

User Manual

DESCRIPTION

The MN291 (Catalog #2115.84) 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. The probe has a measurement range up to 240Arms which makes it the perfect tool for
measurement with DMMs without AC range, recorders. The Model MN291 is compatible with any DC
voltmeter, multimeter, or other voltage measurement instrument that is capable of displaying 100mV of
output per amp of measured current, voltmeter accuracy of 0.75% or better and an input impedance of ≥
1MΩ.

WARNING

The safety warnings are provided to ensure the safety of personnel and proper operation of the
instrument. Read the instruction completely.

• Use caution on any circuit: potentially high voltages and currents may be present and may pose
a shock hazard.

• Do not use the probe if damaged. Always connect the current probe to the measuring device
before it is connected around the conductor

• Do not use on non-insulated conductor with a potential to ground greater than 600V CAT III
pollution 2. Use extreme caution when clamping around bare conductors or bus bars.

• Before each use, inspect the probe; look for cracks in housing or output cable insulation.

• Do not use clamp in wet environment or in locations that hazardous gases exist.

• Do not use the probe anywhere beyond the tactile barrier.

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

overcurrent protection devices, ripple control units, or meters.

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

Examples are measurements on household appliances or portable tools.

VING YOUR SHIPMENT

RECEI

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.

2.56"

.83"

(65 mm)

(21 mm)

2.00"

(51 mm)

MN291

Tactical

Barrier

(keep hands below

this barrier)

5.47"

(139 mm)

(18.5 mm)

.1.18"

.73"

Black

Red

(30 mm)

ELECTRICAL SPECIFICATIONS

Nominal Range: 200A
Measurement Range: 0.5 to 240A
Transformation Ratio: DC Voltage output
Output Signal: 100mV DC/A AC
Accuracy and Phase Shift*:

Accuracy: 0.5 to 10A: 3.0% Reading ± 50mV

10 to 40A: 2.5% Reading ± 50mV

40 to 100A: 2.0% Reading ± 50mV

100 to 240A: 2% Reading

Phase Shift: Not applicable

(*Reference conditions: 18°C to 28°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 > 1M with 2s RC filter.

Overload: 240A for 10 min ON, 30 min OFF
Frequency Range: 40 to 10kHz
Limit Operating Conditions:

200A permanently to 1kHz
Derating above 3kHz: 200A x (1/0.333 F), F in kHz