Specifications 7
U1253B User’s and Service Guide 183
Table 7-3 Accuracy specifications ± (% of reading + number of LSD) for true RMS AC current
Function Range
[7]
Resolution
Accuracy
[1][2]
20 Hz to 45 Hz 45 Hz to 1 kHz
1 kHz to 20
kHz
20 kHz to 100
kHz
[3][4]
Current
500.00 µA
[5]
0.01 µA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
5000.0 µA 0.1 µA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
50.000 mA 0.001 mA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
440.00 mA 0.01 mA 1.0 + 20 0.7 + 20 1.5 + 20 5 + 80
5.0000 A 0.0001 A 1.5 + 20
[6]
0.7 + 20 3 + 60 -
10.000 A 0.001 A 1.5 + 20
[6]
0.7 + 20 < 3 A / 5 kHz -
Notes for AC current specifications:
1 These specifications are defined for signal input > 5% of range.
2 Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specified
accuracy if the signal measured is in the range of 10 A to 20 A for 30 seconds maximum. After measuring a current of
> 10 A, it is recommended that the meter is left to cool down (in switched OFF state) for twice the length of measurement
time used, before using it again to make low-current measurement.
3 Additional error to be added for frequency > 15 kHz and signal input < 10% of range: 3 counts of LSD per kHz.
4 Verified by design and type tests.
5 Input current > 35 µArms.
6 Input current < 3 Arms.
7 2% over-range on all ranges except AC 1000 V range.
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