HP manual About the HP 53181A Calibration Menu, Overview of the HP 53181A Calibration Menu

NOTE

NOTE

POWER

Scale &

Offset

On / Stby

Chapter 2 Service

About the HP 53181A Calibration Menu

About the HP 53181A Calibration Menu

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.

With the exception of the standard timebase oscillator, no adjustments are required for the HP 53181A Counter.

2

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-volatilememory, 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: )

Assembly-Level Service Guide 2-25