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Performance Tests
Model 8902A
23. T u n e the signal generator up another 3 kHz. T h e display should read -80 dB o r
less.
25 kHz Filter: Loss at 2 1.5 kHz Above Lower 6 d B Corner:
-80 d B
"Narrow" Filter Test-Option
Combination 032 and 033
or 032
and 035
24. Perform step 1, then o n the Measuring Receiver, key in the following:
a. Press the blue key then press INSTR PRESET (the AUTOMATIC OPERATION key) t o
b. Key in 100 MHz to inhibit automatic tuning.
c. Key in
24.0 SPCL to initialize the high-selectivity level measurement.
d. Key in 3.1 SPCL to remove the R F input high-pass filter.
e. Key
in 24.3 SPCL to read the I F level.
preset the instrument.
25. Slowly tune the frequency of the signal generator up and down until the peak reading is found.
26. On the Measuring Receiver,
key in 24.3 SPCL and 24.4
SPCL t o establish and display the current
27. T u n e the signal generator down until the
first
minimum is found. T h e display should read -2
I F level as a level reference. (The display should read 0 dB.)
d B o r higher (that is, between -2 and 0 dB).
12.5 kHz Filter:
Loss
at First Minimum: -2 d B
28. Tune the signal generator down until the display reads
-6.00
dB. Record the signal generator's
frequency.
12.5 kHz Filter: Lower 6 d B Frequency:
kHz
27. Tune the signal generator down
1.6 kHz. The display should read
-30 d B o r less (that is, more
negative).
12.5 kHz Filter:
Loss at
1.6 kHz Below Lower 6 d B Corner:
-30 d B
30. Tune the signal generator down another 3 kHz. T h e display should read -80 d B o r less.
12.5 kHz Filter:
Loss
at 4.6 kHz Below Lower 6 d B Corner:
-80 dB
31. Tune the signal generator
up
until the display reads
0
dB. then continue on until the display
reads
-6.00
dB. Record the signal generator's frequency.
12.5 kHz Filter: Upper 6 d B Frequency:
kHz
32. Subtract the reading of step 31 from the reading of step 28. The difference should be between
6.4 and 10.4 kHz.
12.5 LHz Filter: 6 dB Bandwidth: 6.4
10.4 kHz
33. Tune the signal generator up 12 kHz above the frequency recorded in step 28. T h e display
should read -30 dB or less.
12.5 kHz Filter: Loss at 12 kHz Above Lower 6 d B Corner:
-30 dB
34. Tune the signal generator
up
another 3 kHz. The display should read -80 d B o r less.
12.5 kHz Filter: Loss at 15 kHz Above Lower 6 d B Corner:
-80 dB
4-46
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