HP 8901B Operation And Calibration Manual page 344

Performance Tests
Model 8901B
2.
On the Modulation Analyzer, press AM and then press CALIBRATE. Allow at least two readings
(approximately 40 seconds)
to
pass
.
The display should read between 99 and 101%.
AM Calibration Factor 40%
AM Range: 99
101%
3. Key in
2.2
SPCL to set the AM range to 100% AM. Allow at least two readings
to
pass
.
The
display should read between 99 and 101%. Record this value for future reference.
AM Calibration Factor 100% AM Range: 99
101%
Residual AM
4 . On the AMFM test source, set the test mode switch to AM. Connect the test source
AM
output
to
the Modulation Analyzer's INPUT. (See Figure 4-1. Nothing should be connected
to
the test
source's audio input.)
5.
On the Modulation Analyzer, press FREQ and TRACK MODE. T h e the A M F M test source's
carrier frequency to approximately 12.5 MHz. Press TRACK MODE again
to
turn it off.
6. On the Modulation Analyzer, press AM. Key in 2 . 0 SPCL to
set the modulation range to
automatic. Set the other controls as follows:
HP
Filter..
................................................................
.50 Hz
L P Filter
..................................................................
. 3 kHz
Detector.
....................................................................
AVG
The display should show 0.01% or less.
Residual AM
0.01%
AM Distortion
7. Set the audio analyzer's oscillator to 20 kHz. Connect its output to the audio input of the AMFM
test source. (See Figure 4-1.)
NOTE
For this test, if the a d i o analyzer
has
floating input and output connectors,
the low connector should be grounded. Connections should be made to the
high input
or
high output connector.
8.
Set the Modulation Analyzer controls as follows:
H P Filter..
................................................................
A l l O f f
LP Filter
..................................................................
A l l O f f
Detector.
.................................................................
PEAK+
9. Adjust the audio analyzer's oscillator level for a Modulation Analyzer display of 50% AM.
4-4 Performance Test 1