2.7.2 Self-Calibration Failures
In the event of a malfunction such as a burned out detector diode or if you forget to connect the detector
to the calibrator, the Self-Cal function will fail. If this occurs, the following error menu will be displayed:
A Calibration Error Exists
Press [CLEAR] to continue
Press any Units key to repeat cal
Press [CLEAR] to return the instrument to the last mode of operation.
Selecting any Units key gives you the opportunity to correct a simple error such as not connecting the
detector to the calibrator. This can be accomplished, and then the Self-Cal procedure can be repeated.
See Input/Output & Calibration Failure descriptions in Section 6.3.2 for the procedure to follow if the
PPM fails the Self-Cal.
2.7.3 Auto-Zero Function
To initiate the Auto-Zero function, turn off the RF power to the detector to be zeroed and then press
[MENU] [F3] to get to the Self-Cal/Auto-Zero menu. Then press [F2] to Auto-Zero and follow the
displayed prompts.
If the Model 8502A is in use, channel A must be auto-zeroed before channel B. If desired, channel A can
be bypassed by pressing [CLEAR] and going directly to channel B.
Operation
Manual No. 20790, Rev C, November 1998
2-15
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