3458A Calibration Introduction 1
Keysight 3458A Calibration Manual 23
Hardware lock-out of calibration
You can set jumper J132 on the 03458-66505 or -66515 (option 001) assembly to
require removing the instrument cover and repositioning this jumper whenever
adjustments (CAL command) are to be made. Use the following procedure to set
hardware “lock-out” of the CAL and ACAL commands.
1 Remove the instrument top cover as described in steps a and b of the previous
section.
2 With the instrument front facing you, set jumper J132 to the right position.
Neither the CAL or ACAL command can be executed when the jumper is in this
position even when the correct security code is entered.
3 Replace the top cover.
To perform an adjustment with the CAL command or do an auto-calibration with
the ACAL command, you must remove the top cover and set jumper J132 to the
left position (instrument front facing you). You may attach a seal to the top cover
that must be broken to remove the cover indicating if unauthorized access to the
hardware has occurred.
Number of calibrations
You can monitor the number of times calibration has been performed (CAL and
ACAL combined if ACAL is secured by the SECURE command) by using the
CALNUM? command. CALNUM? (calibration number query) returns a decimal
number indicating the number of times the multimeter has been unsecured and
adjusted. The number of calibrations is stored in cal-protected memory and is not
lost when power is removed. The calibration number is incremented by 1
whenever the multimeter is unsecured and a CAL. (or ACAL if secured) is
executed. If autocal is secured, the calibration number is also incremented by 1
whenever an autocal is performed; if unsecured, autocal does not affect the
calibration number.
The multimeter was adjusted before it left the factory. This has incremented the
calibration number. When you receive the multimeter, read the calibration
number to determine the initial value you start with. The procedure for reading
the number of calibrations is presented after this note.
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