6 Performance Tests and Calibration
174 Keysight U1251B and U1252B User’s and Service Guide
12 Turn the Rotary Switch to the
position
Open Input terminal open
(remove any test
leads and Short
Plugs from the
input terminal)
oPEn oPEn
50 mA 30 mA 30.000 mA 30.000 mA
440 mA 300 mA 300.00 mA 300.00 mA
Move the test lead from uA.mA and COM terminal to A and COM terminal
Caution: Connect the calibrator to handheld multimeter's A and COM terminals before applying 3A and 10A
5 A 3 A 3.0000 A 3.0000 A
10 A 10 A 10.000 A 10.000 A
Move the test lead from A and COM terminal to uA.mA and COM terminal
13
Press button to go to
mA mode
50 mA 3 mA, 1 kHz 03.000 mA 03.000 mA
30 mA, 1 kHz 30.000 mA 30.000 mA
440 mA 30 mA, 1 kHz 030.00 mA 030.00 mA
300 mA, 1 kHz 300.00 mA 300.00 mA
Move the test lead from uA.mA and COM terminal to A and COM terminal
Caution: Connect the calibrator to handheld multimeter's A and COM terminals before applying 3A and 10A
14
Press button to go to
A mode
5 A 0.3 A, 1 kHz 0.3000 A 0.3000 A
3 A, 1 kHz 3.0000 A 3.0000 A
10 A 3 A, 1 kHz 3.0000 A 3.0000 A
10 A, 1 kHz 10.000 A 10.000 A
Notes for adjustment table:
[a] Be sure to recalibrate “Short” using the dual banana plug with copper wire after performing calibration for resistance.
[b] Ensure the multimeter is turned on and stabilized for at least 60 minutes, with the K-type thermocouple connected between the multimeter
and the calibrator output terminal.
— Set the 5520A to internal reference.
— Prior to performing adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A
TC output, and the other end to a precision thermometer to verify that the source outputs the desired value. Adjust the source
accordingly if necessary.
— To perform the adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to the multimeter via a TC-to-banana adapter. Allow at least 1 hour for the multimeter to stabilize.
Table 6-4 Adjustment table (continued)
Step Test Function Cal Range Input
Cal Item
U1251B U1252B
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