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Model 8902A
P e r f o r m a n c e
Tests
'Narrow" Filter lest-Option Combination 033 and 035
35.
P e r f '
step
1, then
on the Measuring Receiver, key in
the
following:
a Press t h e
blue key
then press INSTR
PRESET
( t h e 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
i n p t high-pass
f i l t e r .
e. Key in 24.3
SPCL to
read
the IF
level.
presettheizlshme nt.
36. Slowlytunethefre~~ofthesignalgeneratorupanddownuntilthepe~readingisfound
37.
On
the
Measuring Receiver,
key
in 24.3
SPCL
and 24.4
SPCL
to
establiah
and
display the
38. Tune
the
signal
generator
down
u n t i l t h e first
minimum is found.
The
display should read -2
current IF
level
as
a level
reference.
("he
display should read 0
dB.1
dB
or highex (that is,
between
-2
and
0 d B ) .
25 IzEfiFilter:
Loss at F i r s t
Minimum: -2
dB
39. Tune
the
signal generator down
u n t i l
t h e
display reads
-6.00
d B .
Record the
signal
generator's
frequency.
25 kHz Filter:
Lower 6
dB
kequency:
lrHz
40.
Tune
the signal generator down 1.6 kEL.
The
display should read -30
dB
or less (that
is, more
negative).
25 kHz Filter:
Loss
at 1.6
kRz
Below
Lower
6
dB
Corner
-30
d B
41. Tune
t h e
signal
generator
down
another 3 kHz. The display
should
read -80
dB
or less.
25 k H z Filter
Loss
at 4.6
lrHz
Below
Lower
6
dB
Corner
-80
d B
42. 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
43. 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
44. Tune the signal generator up 18.5 kHz above the fi-equency 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
d B
45. Tune the
signal generator up another
3
IrHz.
The display should read -80
d?3
or less.
25 kHz Filter: Loss at 21.5 kHz Above Lower 6
dB
Comer:
-80
dF3
4-47
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