Instruction manual

Chapter 2 Service
About the Agilent 53131A/132A Calibration Menu
Assembly-Level Service Guide 2-7
2
The Calibration menu, illustrated on page 2-8, allows you to:
• view the calibration security status of the Counter (CAL SECURE or CAL
UNSECURE)
• initiate the Counter’s calibration routines, which can perform automatic
calibration of the voltage offset and gain of the front-end input amplifiers (CAL:
OFFS 1 / 2 ?, GAIN 1 / 2?), of the optional timebase (CAL: TIMEBAS?), and
of the differences in electrical path-length between channels 1 and 2 (CAL: TI
QUIK? and CAL: TI FINE?)
• secure against calibration by entering the security code while the Counter is
unsecured (CODE: )
• unsecure for calibration by entering the security code while the Counter is
secured (CODE: )
• change the security code by entering a new code while the Counter is unsecured
(CODE: )
• view the calibration count, which indicates the number of times that the Counter
has been calibrated (CAL COUNT?). The calibration count increments up to a
maximum of 32,767 after which it wraps around to 1. A calibration count of 0
indicates that the Counter is completely uncalibrated. (The calibration count is
unaffected by interpolator calibration.)
•get Help (HELP: ) with any of the following:
– how to calibrate (CAL?),
–how to secure (SECURE?), and
– how to change the code (CODE?)
NOTE A good precaution is to use a GPIB program (see the programming example titled
“To Read and Store Calibration Data” in Chapter 3 of the Programming Guide) to
read and store the calibration factors prior to initiating any calibration.