4
Performance Verification Tests
72
Keysight 3458A Calibration Manual
Ohms Performance Tests
Required equipment
The following list of equipment is required to test the ohms performance of the
3458A.
– Stable resistance standard (Fluke 5700A or equivalent)
– Transfer standard DMM (3458A Opt. 002 within 90 days of CAL)
– Low thermal short (copper wire)
– Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A)
Preliminary steps
1
Verify that the resistance standard is properly warmed up.
2
The 3458A requires a 4-hour warm-up period. If this has not been done, turn
the instrument ON and allow it to warm up before proceeding.
3
The internal temperature of the 3458A under test must be within 5 degrees C
of its temperature when last ohms adjusted. The current internal temperature
can be obtained by executing TEMP?. Compare this temperature to
adjustment temperature obtained by executing the command CAL? 60 and
record both temperatures on the
Test Card.
4
If the instrument self test has not been run, make certain all inputs are
disconnected and execute the TEST function. The display must read “SELF
TEST PASSED”.
5
If you have just performed DCI tests, you have done an ACAL OHMS which
takes approximately ten minutes to complete. Compare the TEMP?
temperatures recorded on the
Test
Cards. If they differ by more than 1
°
C. execute ACAL OHMS again. If DCI tests
have not been done previously, execute ACAL OHMS.
6
Configure the transfer standard DMM as follows:
– OHMF
– NDIG 8
– NPLC 100
Содержание 3458A
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