Specifications 7
U1253B User’s and Service Guide 185
Table 7-5 Accuracy specifications ± (% of reading + number of LSD) for AC+DC current
Function Range Resolution
Accuracy for AC+DC current
[1][2]
Overload
protection
30 Hz to 45 Hz 45 Hz to 1 kHz
1 kHz to 20
kHz
Current
500.00 µA
[3]
0.01 µA 1.1 + 25 0.8 + 25 0.8 + 25 440 mA
5000.0 µA 0.1 µA 1.1 + 25 0.8 + 25 0.8 + 25 10 × 35 mm
50.000 mA 0.001 mA 1.2 + 25 0.9 + 25 0.9 + 25 AC/DC 1000 V
440.00 mA 0.01 mA 1.2 + 25 0.9 + 25 0.9 + 25
30
kA/fast-acting
5.0000 A 0.0001 A 1.8 + 30
[4]
0.9 + 30
3.3 + 70 < 3A /
5 kHz
11 A
10.000 A 0.001 A 1.8 + 30
[4]
0.9 + 25
3.3 + 70 < 3A /
5 kHz
-
Notes for AC + DC current specifications:
1 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 being 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.
2 These specifications are defined for signal input > 5% of range.
3 Input current > 35 µArms.
4 Input current < 3 Arms.
5 For 5 A and 10 A ranges, the frequency is verified for less than 5 kHz
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