Specifications and Characteristics 6
U1241A/U1242A User’s and Service Guide 59
AC Specifications
Table 6 - 18 AC specifications with accuracy of ± (% of reading + No. of Least Significant
Digit)
[1] Input impedance: 10 MW (nominal) in parallel with <100 pF, with overload protection of
1000 V R.M.S.
[2] ACV and AC μA/mA/A specifications are true RMS AC coupled, valid from 5% to 100% of range.
The crest factor may up to 3 at full scale and for 1000 V range, the crest factor is 1.5 at full scale.
For non-sinusoidal waveforms with crest factor ≤ 3, add 2% reading + 2% full scale typical.
[3] Current can be measured from 50 mA to 440 mA continuously. An additional 0.2% needs to be
added to the specified accuracy if the signal measured is in the range of 440 mA to 1100 mA for 30
seconds maximum. After measuring current of > 440 mA, leave the meter to cool down for twice
the measuring time used before application of low current measurement.
[4] Current can be measured from 0.5 A up to 10 A continuously with the maximum operating
temperature of 50 °C. An additional 0.3% needs to be added to the specified accuracy if the signal
measured is in the range of 10 A to 19.999 A for 15 seconds maximum. After measuring a current
of >10 A, leave the meter to cool down for 60 seconds before applying low current measurement.
Function Range Resolution
Test Current/
Burden Voltage
Accuracy
40 Hz to 500 Hz 500 Hz to 1 kHz 1 kHz to 2 kHz
AC Voltage
[1][2]
True RMS
1000.0 mV 0.1 mV –
1% + 5
2% + 5 -
10.000 V 0.001 V – 1% + 5 2% + 5
100.00 V 0.01 V –
1000.0 V 0.1 V – –
AC Current
[2]
True RMS
1000.0 μA0.1 μA < 0.06 V
1% + 5 1.5% + 5
–
10000 μA1 μA < 0.55 V
100.00 mA 0.01 mA < 0.18 V
440.0 mA
[3]
0.1 mA < 0.8 V
10.000 A
[4]
0.001 A < 0.4 V
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