HP 8901B Operation And Calibration Manual page 351

Model
8901B
Performance Tests
5.
On the Modulation Analyzer, key in
2.3
SPCL to set the modulation range
to
400
kHz.
A l l o w at
least two readings
to
pass
.
The display should read between
99
and
101%.
FM Calibration Factor;
400
kHz Modulation Range:
99 101%
6.
On the A M F M test source, set the test mode to FM. Connect its FM+4 output to the Modulation
7. Set the audio analyzer's oscillator
to
10
kHz at
1V.
Connect its output to the audio input of the
Analyzer's INPUT.
(See
Figure
4-2.)
AMFM test source. (See Figure
4-2.)
NOTE
For this test, if the audio analyzer has hating input and output connectors,
the low connector should be grounded. Connections should be made to the
high input or high output connector.
8.
9.
10.
11.
On the Modulation Analyzer, press FREQ and TRACK MODE. Tune the AMFM test source's
carrier frequency to approximately
100
MHz. Press TRACK MODE again
to
turn it off.
On the Modulation Analyzer, press FM. Set
LP
FILTER
to
15
kHz and DETECTOR to AVG.
Key in
2.0
SPCL
to
set the modulation range
to
automatic.
Adjust the audio analyzer's oscillator level for a Modulation Analyzer display of
20
kHz average
deviation. On the Modulation Analyzer, set RATIO on (with LOG/LIN set for a linear display).
Connect the FM+32 output of the A M F M test source to the Modulation Analyzer's INPUT
without disturbing the AM/FM test source's controls. (See Figure
4-2.)
Multiply the displayed
ratio on the Modulation Analyzer by the calibration factor of step
4.
(For example, if the display
reads
12.52%
REL and the calibration factor of step
4
is
100.4%,
the result is
12.52 x 100.4
=
12.57%
REL.) The result should be between
12.35
and
12.65%
REL.
FM Accuracy;
4
kHz Modulation Range:
12.35
12.65%
REL
FM
Distortion,
Accuracy, and
Rejection-1.5
MHz
IF
12.
13.
14.
15.
Connect the FM+4 output of the A M F M test source to the Modulation Analyzer's INPUT.
(See
Figure
4-2.)
On the Modulation Analyzer, set all LP FILTERS to
off,
DETECTOR to PEAK+, and RATIO off.
Set the audio analyzer's oscillator frequency to
100
kHz. Set the level for a Modulation Analyzer
display of 100 kHz peak deviation.
Connect the audio analyzer's input to the Modulation Analyzer's MODULATION OUTPUT/
AUDIO INPUT. (See Figure
4-2.)
Set the audio analyzer to measure the distortion on the
100
kHz signal at the MODULATION OUTPUT/AUDIO INPUT (all audio analyzer filters should
be off). The distortion should be
0.1%
or less
(-60
dB
or less).
FM Distortion at
100
kHz
Rate;
100
kHz Peak Deviation: 0.1%
Performance Test 2
4-11