4 Performance Verification Tests
70 Keysight 3458A Calibration Manual
DC current function gain test
The following is a step-by-step procedure for all test points that performance
verify gain of the DC current function. The procedure requires alternately
connecting the transfer standard DMM and then the 3458A under test to the DC
verification source as described in the section titled General test procedure.
1 Connect the DC current source to the transfer standard DMM I and LO input
terminals using low thermal test leads.
2 Set the range of the transfer standard DMM as specified in Table 4-5.
3 Set the range of the 3458A under test as specified in Table 4-5.
4 Set the DC source to the current level specified in Table 4-5.
5 Execute Trig SGL and read the output of the DC current source as measured
with the transfer standard DMM and record this reading in the “Transfer
standard reading” column of the DC CURRENT TESTS Test Card.
6 Remove the connection from the transfer standard DMM to the DC current
source.
7 Connect the DC current source to the 3458A under test HI and LO input
terminals.
8 Execute Trig and read the value as measured with the 3458A under test and
record this value in the “Unit under test reading” column of the DC CURRENT
TESTS Test Card.
9 Repeat steps 1 through 8 for each of the remaining DC current test points as
specified in Table 4-5.
Table 4-5 DCI gain performance tests
DCI gain test number Source and DMM range Source output
1 100 µA 100 µA
2 1 mA 1 mA
3 10 mA 10 mA
4 100 mA 100 mA
51 A1 A
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