Keysight U1281A - Table 1-8 DC Current (A) Performance Verification Tests

Calibration Procedures 1
Keysight U1281A/U1282A Service Guide 31
Table 1-7 DC current (μA.mA) performance verification tests
Test function Range
5520A/5522A
output
Error from nominal 1 year
U1281A U1282A
DC current (μA.mA)
Turn the rotary switch to the position.
600 μA 600 μA ±0.82 μA ±0.82 μA
6 mA 6 mA ±0.0035 mA ±0.0035 mA
60 mA
[a]
60 mA ±0.080 mA ±0.080 mA
600 mA
[a]
440 mA ±0.71 mA ±0.71 mA
[a] Current can be measured from 30 mA to 440 mA continuously, and > 440 mA to 600 mA for 20 hours maximum. DC ranging from 60 mA to
440 mA have a thermal effect of 0.35 µA/mA. Cool down the multimeter for 6 seconds if 100 mA is applied and at least 3 minutes if
600 mA is applied. Alternatively, use the Null ( ) function to zero the thermal effect before proceeding with a low current measurement or
checking the current offset.
mA
CAUTION
Connect the calibrator outputs to the multimeter’s A and COM terminals
before applying 6 A and 10 A.
Table 1-8 DC current (A) performance verification tests
Test function Range
5520A/5522A
output
Error from nominal 1 year
U1281A U1282A
DC current (A)
Turn the rotary switch to the position.
6 A 6 A ±0.0100 A ±0.0100 A
10 A
[a]
10 A ±0.020 A ±0.020 A
[a] Current can be measured from 1 A to 10 A continuously, with an additional buffer of 0.3%. If the measurement of the signal is between
10 A to 20 A, current can be measured for 30 seconds maximum. After measuring > 10 A current, cool down the multimeter for twice the
measuring time taken and use the Null ( ) function to zero the thermal effect before proceeding for low current measurement.
A