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Performance Tests
Model 8902A
2.
On
the Measuring Receiver, press AM and then press CALIBRATE. Allow at least two readings
(approximately 40 seconds)
to
pass. The display should read between
99
and 101Yo.
AM Calibration Factor 40Yo 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
101Yo
Residual
AM
4.
On the AM/FM test source, set the t.est mode switch to AM. Connect the test source AM
output to the Measuring Receiver's INPUT. (See Figure
4-1.
Nothing should be connected to
the test source's audio input.)
5.
On the Measuring Receiver, press FREQ and TRACK MODE. Tune the AM/FM test source's
carrier frequency to approximately 12.5 MHz. Press TRACK MODE again
to
turn it o f f .
6.
On
the Measuring Receiver, press AM. Key in 2.0 SPCL t o set the modulation range t o auto-
matic.
Set
the other controls as follows:
H P FILTER
....................................................................
50 Hz
LP FILTER
....................................................................
3 kHz
DETECTOR
....................................................................
AVG
The display should
show 0.01%
or less.
0.010/0
Residual AM:
AM
Distortion
7. Set the audio analyzer's oscillator to 20 kHz. Connect its output to the audio input of the
AM/FM test source. (See Figure 4-1.)
NOTE
For
this t w ,
if
the airdio a n a l p r ha.s jlonting inpirt und oirfpiit
connectors,
thc
low connector
shoiild bz groirnhd. Connections shoirld bc
mndc to
thc
high inpiit or high oirtpirt
connwior.
8. Set the Measuring Receiver controls as
follows:
HP FlLTER
................................................................
.ALL OFF
LP FILTER
................................................................
.ALL OFF
DETECTOR
.................................................................
PEAK+
9. Adjust the audio analyzer's oscillator level for a Measuring Receiver display of
500/0
AM.
4-4
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