Performance Verification Tests 4
Keysight 3458A Calibration Manual 57
General test procedure
The following performance tests utilize a transfer standard DMM to precisely
measure the verification source. The transfer standard DMM recommended is an
3458A option 002 (high stability) that is within a 90-day calibration. The
verification source is first measured by the transfer standard DMM and then
connected to the unit under test. The general test procedure is as follows:
A. Performed one time prior to testing (preliminary steps)
1 Verify that the Verification Source is properly warmed up.
2 The 3458A requires a 4 hour warm-up period. Verify that the transfer standard
DMM and the 3458A unit under test (UUT) are properly warmed up.
3 The internal temperature of the 3458A under test must be within
5 degrees C of its temperature when last adjusted (CAL 0, CAL 10, and CAL
10K). These temperatures can be determined by executing the commands
CAL? 58, CAL? 59, CAL? 60.
4 If the instrument self test has not been run, verify all inputs are disconnected
and execute the TEST function. The display must read “SELF TEST PASSED”.
B. Repeated for each function and range tested
5 Execute the ACAL command for the function being tested on both the transfer
standard and the unit under test (UUT).
6 Configure the transfer DMM as specified in each test.
7 Configure the DMM under test as specified in each test.
8 Connect the Verification source to the transfer standard DMM and determine
the source output (see Figure 4-1 (A)). Record this value on the Test Card
under “Transfer Standard Reading”.
9 Disconnect the Verification Source from the transfer standard DMM and
connect it to the 3458A under test (see Figure 4-1 (B)). Record this value on
the Test Card under “Unit Under Test Reading”.
10 Calculate the difference between the transfer standard DMM reading and the
UUT reading. Record the absolute value (ignore sign) of the difference on the
Test Card under “Difference”.
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