Electrical Specifications - Extech Instruments MA443-NIST User Manual

Specifications

Electrical Specifications

Accuracy is given as ± (% of reading + least significant digits) at 23C ±5C with relative humidity ≤ 75%.
Accuracy is specified for a period of one year after calibration.
1. Temperature Coefficient is 0.1 x specified accuracy / C, < 18C (64.5F), > 28C (82.4F)
2. MA443/MA445 AC Functionality: ACV and ACA specifications are AC coupled, True RMS; For non‐
sinusoidal waveforms, additional accuracy Crest Factor (C.F.) considerations exist as detailed below:
Function
AC Current
*4A range on MA440 only
True RMS current (MA443 and MA445 only) applicable to 10%~100% of range
Frequency response: 50~60Hz (MA440 and MA443) and 40~400Hz (MA445)
MA443/MA445 AC Crest factor considerations:
a) Add 4% (MA443) 3% (MA445) when wave factor is 1 ~ 2
b) Add 6% (MA443) 5% (MA445) when wave factor is 2 ~ 2.5
c) Add 8% (MA443) 7% (MA445) when wave factor is 2.5 ~ 3
DC Current
(MA445)
Use the ZERO function to null display (residual magnetism) before taking a measurement.
AC Voltage
True RMS voltage (MA443 and MA445) applicable to 10%~100% of the range
Input Impedance: ≥ 10MΩ; Frequency Response: 50~60Hz (MA440 and MA443) and 40~400Hz (MA445)
MA443/MA445 AC Crest factor considerations:
a) Add 3% when wave factor is 1 ~ 2
b) Add 5% when wave factor is 2 ~ 2.5
c) Add 7% when wave factor is 2.5 ~ 3
DC Voltage
Input Impedance: ≥ 10MΩ
Range Resolution
4.000 A* 0.001 A
40.00 A 0.01 A
400.0 A 0.1 A
40.00 A 0.01 A
400.0 A 0.1 A
4.000V 0.001V
40.00V 0.01V
400.0V 0.1V
600V 1V
400.0mV 0.1mV
4.000V 0.001V
40.00V 0.01V
400.0V 0.1V
600V 1V
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Accuracy (reading)
± (2.5% + 30 digits)
± (1.8% + 9d) MA440
± (2.5% + 5d)
MA443/MA445
± (2.0% + 3 digits)
± (1.2% + 5 digits)
± (1.5% + 5 digits)
± (1.0% + 5 digits)
± (0.8% + 1 digit)
± (0.8% + 3 digits)
± (1.0% + 3 digits)
'OL' Protection
400A
400A
600V AC/DC
600V AC/DC
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