Operation Model
8901B
Front-Panel Key
Special Function Code
or
Measurement
Mode
Action:
FM
Calibration
Factor
Enter the appropriate front-panel key
or
special function code
to
manipulate the FM Calibration Factor
as described in the following table:
Program Code
e
Disable
Enable
Display
Any
17.0 SPCL 17.0SP
sc
FM
(Blue
Key)
(From
CALIBRATE
mode)
SAVE
CAL
Any
17.1
SPCL 17.1SP
Yo
CAL
FACTOR’
FM
Any
17.2
SPCL 17.2SP
CF
(Blue Key)
Calibrating
or
Cross Checking Another
HP
8901
or
8902
RF
Signal Analyzer
To compute an FM calibration factor for another RF signal analyzer that
has
no internal calibrator,
or
that
has
an internal calibrator that
is
to
be cross checked, use the Modulation Analyzer and
its
calibrator as follows:
1.
Connect the Modulation Analyzer’s CALIBRATION AM/FM OUTPUT
to
the RF input of the
other RF signal analyzer.
2.
Key in
12.0
SPCL into the Modulation Analyzer. Record the value
that
appears in the display.
This
is
the computed, calibrated, peak FM deviation (excluding noise).
3.
Key in
12.1
SPCL into both instruments. Record the value
that
appears on the display of the
RF
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 RF signal analyzer.
4.
Key in
12.2
SPCL for both instruments. Record the value that appears on the display of the
RF 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).
5.
On the RF signal analyzer, select PEAK-. Note the value displayed on 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)
=
6.
Compute the FM calibration factor of the RF signal analyzer as follows:
(12.2
result)
-
(12.1
result)
(12.0
result)
FM
Calibration Factor
(%)
=
100
x
7.
TO
use this FM calibration factor to correct FM measurements made with the RF signal analyzer,
enter the value
as
a ratio reference and use the Ratio function
in
the RF signal analyzer.
3-156
FM Calibration
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