Operation Model
8901B
Front-Panel
Key
or
Special Function Code
Measurement
Mode
Action:
AM
Calibration
Factor
Enter the appropriate front-panel key or Special Function code
to
manipulate the AM Calibration
Factor
as
described in the following table:
Program Code
Disable
I
Any
I
16.0 SPCL
16.0SP
Enable
AM
(From CALIBRATE mode)
Any
sc
(Blue
Key)
SAVE CAL
16.1 SPCL 16.1 SP
~
AM
Any
Display
Calibrating or Cross Checking Another
HP
8901
or
8902
RF
Signal Analyzer
To compute an AM 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:
~~
CF
(Blue Key)
16.2 SPCL 16.2SP
Yo
CAL FACTOR’
1.
2.
3.
4.
5.
6.
3-142
AM
Connect the Modulation Analyzer’s CALIBRATION AM/FM OUTPUT
to
the RF input of the
other RF signal analyzer.
Select
13.0
SPCL for the Modulation Analyzer. Record the value
that
appears on the display.
This
is
the computed, calibrated, peak AM depth (excluding noise).
Select
13.1
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 weighted, peak, residual
AM
depth of the calibrator’s unmodulated output
as
demodulated
by the RF signal analyzer.
Select
13.2
SPCL for both instruments. Record the value that appears on the display of the
RF signal analyzer. This value
is
the demodulated, positive, peak AM depth of the calibrator’s
modulated output.
(If
display jitter makes readings difficult, select
5.1
SPCL.)
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
Cwo
need not be computed; use the result from step
4.
If the difference
between the two results
is
greater than three counts in the least significant digit, compute the
average as follows:
(result
of
step 4)
+
2(resuZt
of
step
5)
3
(13.2
result)
=
Compute the AM calibration factor of the RF signal analyzer as follows:
(13.2 result)
-
(13.1 result)
(13.0 result)
AM
Calibration Factor
(%)
=
100
x
Calibration
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