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
10
4-37
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