HP 8901B Operation And Calibration Manual page 375

Performance Tests
Procedure
Model
8901B
NOTE
In the following procedure the signal generator can be connected either to a
sensor module (which
is
connected to the Modulation Analyzer) or directly
to the Modulation Analyzer's INPUT connector.
The
procedure
is
written
for the latter case.
Initial Setup
1.
Set the signal generator to
455.0
kHz CW at
+3
dBm. Connect the signal generator's output to
the Modulation Analyzer's INPUT. Allow the equipment to warm up at least one-half hour.
"Wide" Filter Test-Option Combination
032
and
037
2.
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.
3.
Slowly tune the frequency of the signal generator up and down until the peak reading
is
found.
4.
On the Modulation Analyzer, key in
24.1
SPCL and
24.2
SPCL to establish and display the
5.
T h e the signal generator down until the first minimum is found. The display should read
-2
dB
current
IF
level as a level reference. (The display should read 0
dB.)
or higher (that is, between
-2
and 0
dB).
12.5
kHz Filter: Loss at First Minimum:
-2
dB
6. Tune the signal generator down until the display reads
-6.00
dB.
Record the signal generator's
frequency.
12.5
kHz Filter: Lower
6
dB
Frequency:
kHz
7. Tune the signal generator down
1.6
kHz. The display should read -30
dB
or less (that is,
more negative).
12.5
kHz Filter: Loss at
1.6
kHz Below Lower
6
dB
Corner:
-30
dB
8. T h e the signal generator down another
3
kHz. The display should read -80
dB
or less.
12.5
kHz Filter: Loss at
4.6
kHz Below Lower
6
dB
Comer: -80
dB
9.
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
dB
Frequency:
kHz
10. Subtract the reading of step 9 from the reading of step 6. The difference should be between 6.4
and
10.4
kHz.
12.5
kHz Filter:
6
dB
Bandwidth:
6.4
10.4
kHz
4-34
Performance Test
10
rev. 1 OJUL87