HP 8901B Operation And Calibration Manual page 376

Model 8901B
Performance Tests
11. Tune the signal generator up 12 kHz above the frequency recorded in step 6. The display should
read -30
dB
or less.
12.5
kHz Filter:
Loss at 12 kHz Above Lower 6
dB
Comer:
-30
dB
12. Tune the signal generator up another 3
kHz.
The display should read -80
dB
or less.
12.5
kHz
Filter:
Loss
at 15 kHz Above Lower 6
dB
Comer:
-80
dB
"Wide" Filter Test-Option Combination
032
and
033 or 033
and
037
13.
14.
15.
16.
17.
1 8 .
19.
20.
21.
22.
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 24.1 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
24.1
SPCL and 24.2 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
T h e 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 20 from the reading of step 17. 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 17. The display should
read -30
dB
or less.
25 kHz Filter: Loss at 18.5 kHz Above Lower 6
dB
Corner:
-30
dB
rev.lOJUL87
Performance Test 10 4-35