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Chapter 2 Service
About the HP 53181A Calibration Menu
2-26 Assembly-Level Service Guide
2
• 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 an HP-IB 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.