General Test Procedure - Agilent Technologies 3458A Calibration Manual

General Test
Procedure
36 Chapter 4 Performance Verification Tests
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 6A). 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 6B). 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".
11. Compare this difference to the allowable difference specified on the
Test Card. If less than the specified difference, note that the test
passed. If greater than the specified difference, note that the test failed.