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Opera ti on
Model 8902A
~~
~
Disable
Enable
Selecting
%
CAL FACTOR (Blue Key, MHz) or 16.2 SPCL displays the Calibration Factor being
used.
Enter the appropriate front-panel key or special function code to manipulate the FM Calibration
Factor as described in the following table:
Any
17.0 SPCL
17.0SP
FM
(Blue Key)
(From CALIBRATE mode)
SAVE CAL
Anv
17.1 SPCL
17.1SP
sc
~~
Action:
FM Calibration
Factor
FM
Any
Display
Measurement
Mode
CF
(Blue Key)
%
CAL FACTOR'
17.2 SPCL
17.2SP
I
Front-Panel Key
I
Program Code
or
I
Special Function Code
Calibrating or Cross Checking Another
HP
8901 or 8902
RF
Signal Analyzer.
To compute an FM calibration factor for another R F signal analyzer that has no internal calibrator,
o r that has an internal calibrator that is to be cross checked, use the Measuring Receiver and its
calibrator as follows:
1.
2.
3.
4.
5.
6.
Connect the Measuring Receiver's CALIBRATION AM/FM OUTPUT to the R F input of the
other R F signal analyzer.
Key in 12.0 SPCL into the Measuring Receiver. Record the value that appears in the display.
This is the computed, calibrated, peak FM deviation (excluding noise).
Key in 12.1 SPCL into both instruments. Record the value that appears on the display of the
R F signal analyzer. (If display jitter makes readings difficult, key in
5.1
SPCL.) The displayed
value is the weighted, peak, residual FM deviation of the calibrator's unmodulated output as
demodulated by the R F signal analyzer.
Key in 12.2 SPCL for both instruments. Record the value that appears on the display of the R F
signal analyzer. (If display jitter makes readings
difficult,
select 5.1
SPCL.)
The displayed value
is the demodulated, positive, peak FM deviation of the calibrator's modulated output (including
noise).
On the RF signal analyzer, select PEAK-. Note the value displayed o n the RF signal analyzer. If
the difference between the results of steps
4
and 5 is three counts or less in the least significant
digit, an average between the two need not be computed; use the result from step
4.
If the
difference between the two readings is greater than three counts in the least significant digit,
compute the average as follows:
(result
of
step
4)
+
(result
of
step 5 )
2
(12.2 result)
=
Compute the FM calibration factor o f the R F signal analyzer as follows:
(12.2 result)
-
(12.1 result)
(12.0 result)
F M
Calibration
Factor (%)
=
100 x
3- 182
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