Performance Tests Model 8901B
Audio
Synthesizer
Frequency (HZ)
50
000
100
000
50
20
AM Accuracy
16. On the Modulation Analyzer, press RATIO
to
turn
it
off.
Press PEAK+. Key in
5.1
SPCL
to
set
the audio detector time constant to slow.
17. Set the audio synthesizer frequency to 10 kHz. Set
its
level for
a
display of 80% AM times the
calibration factor of step 3. (For example,
if
the calibration factor of step
3
is
100.495, set the
level for
a
display of 80.3% AM.)
18.
On the Modulation Analyzer, key in
80
and
press RATIO. Set the audio synthesizer
to
the
frequencies shown in the following table (without changing the level). For each setting, the
Modulation Analyzer’s display should read between the limits indicated in the table.
~ ~~ ~
AM
Limits
(YO
REL)
Lower Actual Upper
98.9
-
101.1
96.9
-
103.1
98.9
-
101.1
96.9
-
103.1
r
Audio
Synthesizer
heauency(Hzl
I
I
I
I
I
AM Limits
(%
REL)
~ower
I
~ctual
I
upper
NOTE
fl
digit at a nominal reading
of
80.0
is
about
fl%
of
the reading
in
the
RATIO
mode.
20
50
10
000
96.9
-
103.1
97.9
-
102.1
97.9
-
102.1
AM
Rejection
20. On the Modulation Analyzer, press RATIO
to
turn
it
off.
Set the HP FILTER
to
50
Hz
and the
21.
Set the audio synthesizer frequency to
1
kHz. Set its level for a Modulation Analyzer display of
22.
On
the Modulation Analyzer, press FM. Momentarily disconnect the audio input
to
the AMFM
LP FILTER
to
3 kHz.
50%
AM.
test source and note the residual FM displayed on the Modulation Analyzer.
Residual FM;
455
kHz
IF:
Hz
23. Reconnect the audio input of the AMFM
test
source. Note the Modulation Analyzer’s displayed
FM. The displayed FM minus one-half the residual FM noted in step 22 should be 20
Hz
peak
or
less.
AM Rejection (with FM); 455
kHz
IF:
20
Hz
4-6 Performance Test
1
To Next Page
Loading...
