Chapter 2 Service
About the HP 53181A Calibration Menu
Assembly-Level Service Guide 2-25
2
About the HP 53181A Calibration Menu
NOTE
If you are familiar with the information provided in this section, proceed
to the section titled “The HP 53181A Calibration Procedures” (page 2-31)
to calibrate your Counter. This section, “About the HP 53181A Calibration
Menu,” can be used as a reference.
NOTE
With the exception of the standard timebase oscillator, no adjustments are
required for the HP 53181A Counter.
Overview of the HP 53181A Calibration Menu
The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. All of the calibration factors and security
settings are stored in non-volatile memory, and do not change when power
has been off or after a remote interface reset.
A calibration security code feature allows you to enter a security code
(electronic key) to prevent accidental or unauthorized calibrations of the
Counter. The security code is set to 53181 when the Counter is shipped
from the factory. If you forget your security code, you can reset the
security code to the model-number default by resetting all of the
non-volatile memory to a default state.
The Calibration menu, illustrated on page 2-27, 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?, GAIN 1?), of the optional timebase
(CAL: TIMEBAS?)
• secure against calibration by entering the security code while the
Counter is unsecured (CODE: )
Scale &
Offset
On / Stby
POWER
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