HP 8901B Operation And Calibration Manual page 378

Model 8901B
66Narrow" Filter Test-Option Combination
033
and
035
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
Performance Tests
Perform step 1, then on the Modulation Analyzer, key in the following:
a. Press the blue key then press INSTR PRESET (the AUTOMATIC OPERATION key) to
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 RF input high-pass filter.
e. Key in 24.3 SPCL to read the
IF
level.
preset the instrument.
Slowly tune the frequency of the signal generator up and down until the peak reading is found.
On the Modulation Analyzer, key in 24.3 SPCL and 24.4 SPCL to establish and display the
current
IF
level as a level reference. (The display should read 0
dB.)
Tune the signal generator down until the first minimum is found. The display should read -2
dB
or higher (that is, between -2 and 0
dB).
25 kHz Filter: Loss at First Minimum: -2
dB
Tune the signal generator down until the display reads -6.00
dB.
Record the signal generator's
frequency.
25 kHz Filter: Lower 6
dB
Frequency:
kHz
Tune the signal generator down 1 . 6 kHz. The display should read -30
dB
or less (that is,
more negative).
25 kHz Filter: Loss at 1 . 6 kHz Below Lower 6
dB
Comer:
-30
dB
Tune the signal generator down another 3 kHz. The display should read -80
dB
or less.
25 kHz Filter: Loss at 4.6 kHz Below Lower 6
dB
Comer:
-80
dB
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.
25 kHz Filter: Upper 6
dB
Frequency: kHz
Subtract the reading of step 42 from the reading of step 39. The difference should be between
12.4 and 16.9 kHz.
25 kHz Filter: 6
dB
Bandwidth 12.4 16.9 kHz
Tune the signal generator up 18.5 kHz above the frequency recorded in step 39. The display should
read -30
dB
or less.
25 kHz Filter:
Loss
at 18.5 kHz Above Lower 6
dB
Comer:
-30
dB
Tune the signal generator up another 3 kHz. The display should read -80
dB
or less.
25 kHz Filter: Loss at 21.5 kHz Above Lower 6
dB
Corner:
-80
dB
rev.1 OJUL87
Performance Test 1 0
4-37