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Calibration
3-3
1. Connect the HP 11722A Sensor Module (or a 50 ohm cable
and Type-N adapter) from the INPUT 50R port to the AM/FM
CALIBRATION output port (lower left corner on front panel).
2. Press the AM or FM key to select the measurement you wish
to calibrate. You will need to repeat this entire procedure twice
if you wish to calibrate both your
AM and FM measurements.
3. Press the
CALIBRATE key to turn on the Calibrator. Wait for the
Calibration Factor to be displayed. The calibration factor will be
displayed as a percentage. This percentage indicates the relationship
between the HP 8902A's measurement and the actual output of
the Calibrator. (For example, a calibration factor of 100% indicates
that the measured value is exactly the same as the calibrator output
value. Likewise, a calibration factor of 100.17% indicates that the
HI' 8902A is measuring
.17% above the Calibrator's actual output.)
Remember
While the HP
8902A
is in the Calibration mode (Calibrator key lit), the
calibration factor is stored in the instrument's non-volatile memory
each time i t is updated (approximately every
17
seconds). To ensure
that the measurement circuitry is fully settled, allow the instrument
t o update the calibration factor at least three times before proceeding.
4.
Press the Blue Shift key and then the SAVE CAL key (only
when in the Calibration mode) to enable the calibration factor
(the same as entering 16.1 or 17.1 SPCL when not i n the
Calibration mode). Wait for the calibration factor to be displayed.
5.
Press the CALIBRATE key to turn off the Calibrator. The calibration
procedure is complete. You can now connect the HP 8902A to
your signal source and be assured that you are making the most
accurate modulation measurements possible with the HI' 8902A.
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