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. The the AMFM
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
LP 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 adio 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:
HP Filter..
................................................................
All
Off
LP Filter
..................................................................
All
Off
Detector.
.................................................................
PEAK+
9.
Adjust the audio analyzer’s oscillator level for a Modulation Analyzer display of
50%
AM.
4-4
Performance Test
1
To Next Page
Loading...
