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252 L4400 User’s Guide
A L4451A and L4452A Calibration Procedures
Calibration Process
The following general procedure is the recommended method to complete
a full instrument calibration.
1 See “L4451A and L4452A Performance Test Considerations.”
2 Perform the verification tests to characterize the instrument (incoming
data).
3 Unsecure the instrument for calibration (“Calibration Security" on
page 250).
4 Perform the DAC adjustment procedures on either the L4451A or
L4452A.
5 Secure the instrument against unauthorized calibration.
6 Note the security code and calibration count in the instrument’s
maintenance records.
Aborting a Calibration in Progress
Sometimes it may be necessary to abort a calibration after the procedure
has been initiated. You can abort a calibration at any time by turning off
the power. You can also abort the calibration by sending the device clear
message or the CALibration:ABORt command.
CAUTION
If you abort a calibration in progress by cycling power when the instrument
is attempting to write new calibration constants to EEPROM, you may lose
all calibration constants for the function. Typically, upon re-applying power,
the instrument will report error 705 Cal:Aborted. You may also generate
errors 740 through 746. If this occurs, you should not use the instrument
until a complete re-adjustment has been performed.