HP 8901B Operation And Calibration Manual page 101

Calibration
3-3
1 . Connect the HP 11722A Sensor Module (or a 50R 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 8901Bs 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
HP 8901B is measuring .17% above the Calibrator's actual output.)
Remember While the HP 8901B 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
to update the calibration factor a t least three times before proceeding.
4.
Press the
Blue
Shift key and then the
SAVE CAL
key (only
when i n the Calibration mode) to enable the calibration factor
(the same as entering
16.1
or 17.1
SPCL
when not in 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 8901B to
your signal source and be assured that you are making the most
accurate modulation measurements possible with the HP 8901B.