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Chapter 2 Service

About the HP 53181A Calibration Menu

Assembly-Level Service Guide 2-25

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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HP 181A Manual do Utilizador Página 121