HP 8901B Operation And Calibration Manual page 379

P e r f o r m a n c e
Tests
Performance Test
10a
Model
890lB
30KHZ (CELLULAR RADIO) ALTERNATE CHANNEL FILTER
-
OPTION 035
Description
Option 035 Performance Verification
This
test
is
to be
performed on
Option030 instnune nts
containing Option 035
as one
ofthe alternate
channel filters. Inthis
test anHP8662A(or level
~ ~ c c u ~ a c g
equivaleat altemative)
is usedto simulate
both
an in-chanml and adjacent
channel signal.
The
signal generator
is first
tuned
in-channel
60
that
t h e
reference can be set
for
the
adjacent channel
power
measurement.
The
signal generator
is
thentunedto the
adjacent channel and
t h e LO
shjftedto
measure the
signal generator.
The
output
level of the signal generator
is
varied
to exercise
M m n t combinations
of IF
gain
Equipment
S i g n a l
Generator..
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HP
8662A
Procedure
Initial Setup
1.
Set
the
signal
generator
to
150MHz
CW at 0
dBm.
Connect
the signal generator output
to
the
Measuring Receiver's
RF'
Input. Allow
all
equipment
30
m i n u t e warmup minimum.
Filter Test of Option
030
Combination Which Includes Option
035
2.
On the Measuring Receiver, key in the following:
a.
41.0SP (Performs instrument PRESET)
b. 150
MHz
(Manually
tunes
the
LO)
c. 24.0SP (Initializes Option 030)
d. 24.1SP (Selects Option 035 filter, displays
IF
reference level value)
e. 30 kHz UP
(Increments
LO
up one channel spacing)
f. 24.2SP (Displays Option 035 filter ratio level value)
3. Offset the signal generator
U p
one channel spacing by incrementing fi.equency
30 Wz
(150.030
4. Change signal generator power level to -75
dBm. Read the ratio displayed on the Measuring
MHz). The Measuring Receiver should display approximately 0
dB.
Receiver. If the display is slightly unstable due
to
noise, then average the readings.
LEVEL RATIO -75dB
(f1.5dB)
5. Change signal generator power level to -65 dBm. Read the ratio displayed on Measuring
Receiver.
LEVEL RATIO
-65dB
(fl.5dB)
6. Change signal generator power level to -45 dBm. Read the ratio displayed on Measuring
Receiver.
LEVEL RATIO -45dB (f1.5dB)
7. Change signal generator power level to -25 dBm. Read the ratio displayed on Measuring
Receiver.
LEVEL RATIO -25dB (k1.5d.B)
8. Change signal generator power level to -10 dBm. Read the ratio displayed on Measuring
Receiver.
LEVEL RATIO - 1 O d B (k1.5dB)
4-38
Performance Test
10a
reu.
01 OCT92