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3-2
Calibration
Calibration
The HP 8902A meets its specified AM and FM measurement
accuracy without needing any additional calibration other than the
recommended procedure performed annually to re-calibrate the entire
instrument. The following calibration procedure allows you to further
enhance the accuracy of your AM and FM measurements, however.
AM
and
FM Calibration
By making comparative measurements against a known modulation
level (provided by the AM/FM CALIBRATION output port),
the instrument creates a calibration factor that can be used to
minimize measurement error. Once the calibration factor has been
created, you have control over when it is used by the instrument.
(There is not a calibration procedure for the <PM measurement.)
The following chart lists the special function codes for enabling, disabling,
or displaying the calibration factor. After you have enabled the calibration
factor, the HP 8902A will automatically apply it to its AM or
FM measurements.
Note
To ensure the highest possible measurement accuracy, allow the
HP
8902A
to warm up a t least thirty minutes before performing
the calibration procedure.
Also,
to ensure that
the
measurement
circuitry is fully settled, allow the HP
8902A
to update
the
calibration factor a t least three times before completing the
calibration procedure. (The calibration factor is updated
approximately every
17
seconds while the Calibrator is on.)
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