178 U1253B User’s and Service Guide
7 Specifications
[2]
Input impedance: Refer to Ta b l e 7 - 1 8 .
[3]
Input current > 35 μArms.
[4]
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, leave the meter to cool down (in switched OFF state) for twice the measurement time used, before using it again to make
low-current measurement.
[5]
Input current < 3 Arms.
[6]
2% over-range on all ranges except AC 1000 V.
[7]
These specifications are defined for signal input > 5% of range.
[8]
For 5 A and 10 A ranges, the frequency is verified for less than 5 kHz.
[9]
Crest factor ≤ 3.0 at full scale, 5.0 at half scale except the 1000 mV and 1000 V ranges where it is 1.5 at full scale, 3.0 at
half scale. For non-sinusoidal waveform, add 0.1% of reading ± 0.3% of range.
[10]
Verified by design and type tests.
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