AEMC instruments MN312 Manual de usuario
AC Current Probe
Models MN312 and MN313
User Manual
DESCRIPTION
The MN312/313 (Cat. #2116.24/2116.25) are the latest in compact AC current probes. Designed to
meet the most stringent demands in industry and electrical contracting, they also meet the latest safety
and performance standards. The probes have a measurement range up to 200Arms which make them
perfect tools for measurements with DMMs, recorders, power and harmonic meters. The Models
MN312/MN313 are compatible with any AC ammeter, multimeter, or other current measurement with an
input impedance lower than 1 . To achieve the stated accuracy, use the MN312/MN313 with an
ammeter having an accuracy of 0.75% or better.
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 III: For measurements performed in the building installation at the distribution level such as on
hardwired equipment in fixed installation and circuit breakers.
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.
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ELECTRICAL SPECIFICATIONS
Nominal Range: 0A
Measurement Range: 0.1 to 200A
Transformation Ratio: 1000:1
Output Signal: 1mA/A on 1
Accuracy and Phase Shift*:
Accuracy:
0.1 to 1A: 2.0% Reading ± 0.02mA
1 to 80A: 1% Reading ± 0.02mA
80 to 100A: 1.5% Reading ± 0.1mA
100 to 150A: 2.5% Reading ± 0.5mA
150 to 200A: not specified
Phase Shift:
0.1 to 1A: Not Specified
1 to 20A: 3°
20 to 80A: 2°
80 to 150A: 2.5°
*Reference conditions: 20°C to 26°C, 20 to 75% RH,
external magnetic field <40 A/m, 48 to 65Hz sine wave,
distortion factor less than 1%, no DC component, no
external current carrying conductor, test sample centered.
Load impedance 1 .
Frequency Range: 40 to 10kHz
Limit Operating Conditions:
200A permanently to 1kHz;
Derating above 3kHz: 200A x (1/0.333 F), F in kHz
MN312 MN313
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Crest Factor:
3 @ 200A peak max with an error (due to CF)
of 3%
Open Secondary Voltage:
8V peak max.
Working Voltage:
600Vrms
Common Mode Voltage:
600Vrms
Influence of Adjacent Conductor:
< 15mA/A at 50Hz
Influence of DC (< 10A) on AC signal:
< 10%
Influence of Conductor Position in Jaw:
0.5% of mA output @ 50/60Hz
Influence of Frequency:
40Hz to 1kHz: 5% of mV output
1kHz to 10kHz: 15% of mV output
Influence of Load:
From 0.1 to 5 and 0.7V peak max
< 0.5% for output < 0.5° for phase
Influence of Temperature:
200 ppm/°K, or 0.2% of mA output per 10°K
Influence of Humidity (10 - 90% RH):
0.2% of mA output per 10°K
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” (20mm), bus bar 20 x 5mm
Case Protection:
IP 40 (IEC 529)
Drop Test:
Test per IEC 68-2-32:
1.0m drop on 38mm 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 30mm)
Weight:
6.5oz (180g)
Polycarbonate Material:
Jaws: Polycarbonate with 10% fiberglass charge,
Red UL 94 V0
Case: Polycarbonate 920A Gray
Opening Operations - Life:
> 50,000
Output:
MN312: Two standard safety banana jacks (4mm)
MN313: Double/reinforced insulated 5 ft (1.5m)
lead with safety 4mm banana plug
SAFETY SPECIFICATIONS
AC Current Probe MN312 ................. Cat #2116.24
AC Current Probe MN313 ................. Cat #2116.25
Electrical:
Double insulation or reinforced insulation between
the primary or secondary and the outer case of the
handle conforms to IEC 1010-2-32.
Common Mode Voltage:
600V Category III, Pollution Degree 2
ORDERING INFORMATION
Accessories:
Lead, set of 2, 5 ft
....
Cat # .
Banana plug adapter
(to non-recessed plug) .......................
Cat #1017.45
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99-MAN 100159 v /
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 MN312/MN313
Connect the black lead of the current probe to “common” and the red lead to the AC current input on
your DMM or other current measuring instrument. Select the appropriate current range (400mA AC
range). Clamp the probe around the conductor to be tested with the arrow pointed toward the load. If
the reading is less than 10mA, select the lower range until you obtain the best resolution. Read the
value display on the DMM and multiply it by the probe ratio (1000/1). (If reading = 102mA, the current
flowing through the probe is 102mA x 1000 = 102000mA AC = 102A).
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.
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 contact our technical hotline:
LIMITED WARRANTY
The current probe is warranted to the owner for a period of year 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.
Please print the online Warranty Coverage Information for your records.
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