AEMC JM840A Data sheet
AC Current Probes Model JM840A (pdf) Rev. 03 10/05
Technical Assistance (800) 343-1391 www.aemc.com1of 4
AC Current Probe
Model JM840A
The Model JM840A is a high
performance AC current probe for
higher currents. Excellent transformation
and low phase shift, plus a broad
frequency response, permit accurate
measurements of current and power.
The high quality magnetic core and
uniform windings provide for accurate
measurements up to 500A
AC/1000AAC/
1800A
AC. The “squared” jaw permits
multiple conductor or bus bar positioning.
The Model JM840A provides excellent
True RMS capabilities and reliable
signal reproduction.
The Model JM840A first works as a
traditional current transformer providing
current outputs (mA) over a broad
range of transformation ratios. The
Model JM840A is designed for use on
DMMs, power and harmonic meters,
recorders or instruments with AC
current ranges.
Features
• Nominal range: 500AAC, 1000AAC,
1500A
AC (continuous cycle for the
full temperature range)
• Transformation ratio: 500:1, 1000:1,
1500:1
• Output: 2mA, 1mA
AC/AAC and
0.66mA
AC/AAC
• Designed for use on DMMs, power
and harmonic meters, recorders or
instruments with AC current ranges
Applications
• Field testing
• Electrical utility
• HVAC
• Industrial maintenance
• Laboratory
• Plant maintenance
AC Current Probes Model JM840A (pdf) Rev. 03 10/05
Technical Assistance (800) 343-1391 www.aemc.com2of 4
Specifications
MODELS JM840A
ELECTRICAL
Nominal Range 1500A
Measurement Range 1 to 1800AAC
Transformation Ratio 500:1. 1000:1, 1500:1
Output Signal 2mA
AC/AAC (1A @ 500A)
1mAAC/AAC (1A @ 1000A)
Accuracy (500A Range)
25A 4% of Reading
100A 3% of Reading
500A 3% of Reading
Phase Shift (500A Range)
25A 4°
100A 3.5°
500A 2° –
Accuracy (1000A Range)
50A 3% of Reading
200A 2% of Reading
1000A 1% of Reading
Phase Shift (1000A Range)
50A 3°
200A 1.5°
3000A 1°
Accuracy (1500A Range)
75A 1.5% of Reading
300A 0.75% of Reading
1500A 0.5% of Reading
Phase Shift (1500A Range)
75A 1.5°
300A 0.75°
1500A 0.5°
Overload 700A for 10 min (500A);
1400A for 10 min (1000A);
1800A for 10 min (1500A)
Frequency Range 30 to 1500Hz; current
derating above 1500Hz
for continuous use
Load Impedance ≤5Ω
(500A, 1000A, 1500A)
Working/Common
Mode Voltage
600V
AC
Output Termination Jack
MECHANICAL
Operating Temperature 14° to 122°F (-10° to 50°C)
Storage Temperature -13° to 176°F (-25° to 80°C)
Jaw Opening 3.54" (90mm)
Maximum Conductor Size Cable: 2.52" Ø max (64mm); Bus bar: 1.97 x 5.31" (50 x 135mm); 2.52 x 3.94" (64 x 100mm)
Dimensions 4.72 x 12.40 x 1.89" (120 x 315 x 48mm)
Weight 2.65 lbs (1200g)
Polycarbonate Material Handles: 10% fiberglass charged polycarbonate UL94 VO; Jaws: ABS UL V2
SAFETY
Electrical EN61010-2-32
Electromagnetic EN 50081-1 Class B; EN 50082-2 Electrostatic discharge IEC 100-4-2;
Compatibility Radiated field IEC 1000-4-3; Fast transients IEC 1000-4-4; Magnetic field at 50/60Hz IEC 1000-4-4
Double Insulation Yes
CE Mark Yes
Note: Reference conditions:
23°C ± 3°K, 20 to 85% RH, 45 to 65Hz, external magnetic field < 40A/m, no DC component, no external current carrying conductor,
test sample centered.
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