Greenlee CMT-90 Manuel D'instructions page 11

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Accuracy
Refer to "Specifications" for operating conditions and temperature coefficient.
Accuracy is specified as follows: ± (a percentage of the reading + a fixed
amount) at 23 °C ± 5 °C (73.4 °F ± 9 °F), 0% to 80% relative humidity.
Accuracy for AC measurements is specified for input crest factors that do not
exceed the values in the "Maximum Input Crest Factor" table on this page.
Accuracy Table
Characteristic
0.6 to 170.0 A
AC Current
170.1 to 600.0 A
AC Voltage* 1.3 to 999.9 V
1.8 to 999.9 V
DC Voltage*
–0.6 to –999.9 V
0.0 to 99.9 Ω
Resistance**
100 to 2000 Ω
* Input impedance: 4 kΩ nominal at voltages up to 30 V;
increases with voltage to approximately 277 kΩ at 1000 V
** Open circuit voltage: 1.5 V maximum
† Multiply temperature coefficient times 1.5 when operating temperature
is above 40 °C.
Maximum Input Crest Factor
Maximum
Crest Factor
1.414
3
5
Linear decrease from
5 to 1.5 over
range shown
Continuity
Tone on: Circuit resistance is ≤ 25 Ω (approximately).
Tone off: Circuit resistance is ≥ 400 Ω (approximately).
Range Accuracy
± (1.9% + 1 A)
± (1.9% + 2 A)
± (1.5% + 0.3 V)
± (1.0% + 0.2 V)
± (1.0% + 0.4 V)
± (2% + 1.0 Ω)†
± (2% + 2 Ω)†
Current
Range
0.6 to 6.0 A
6.1 to 20.0 A
20.1 to 500.0 A
500.1 to 600.0 A
CMT-90
Frequency
Range
50 to 60 Hz
50 to 500 Hz
N/A
N/A
Voltage
Range
1.3 to 3.0 V
3.1 to 10.0 V
10.1 to 250.0 V
250.1 to 999.9 V
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