1 3458A Calibration Introduction
24 Keysight 3458A Calibration Manual
Read the number of calibrations with the following procedure:
1 Access the CALNUM? command. In the full command menu, press the blue
SHIFT key then the C menu key. Use the
↓ scroll key to display the CALNUM?
command. (Full command menu is obtained by pressing the blue SHIFT key,
the “menu” key, the
↑ scroll key, and ENTER key.)
2 Press the ENTER key.
3 The display indicates CALNUM and the current number of calibrations.
Monitoring for CAL violations
You can use the CALSTR command in conjunction with the CALNUM? command
to monitor for calibration (CAL) violations. After each authorized calibration has
taken place, use the CALNUM? command to access the current number of
calibrations as described in the previous section. Store this number in the
calibration string (must be done remotely) with the CALSTR command i.e.
OUTPUT 722;“CALSTR 'calnum = 270'”. At any later time, you can execute the
CALNUM? and CALSTR? commands and compare the two calibration numbers. If
the CALNUM is greater than the CALSTR entry, calibration security has been
violated and unauthorized adjustments performed.
The following example illustrates monitoring for CAL violations:
1 After adjustments are performed, execute CALNUM?. Display shows “CALNUM
270”
2 Remotely execute OUTPUT 722;“CALSTR 'CALNUM=270'”
3 At a later time you can verify if CAL has been violated by executing CALNUM?
and CALSTR shift? to see if CALNUM is greater than that stored in CALSTR.
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