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Model
8902A
Performance Tests
Performance Test 13
HIGH-SELECTIVITY GAIN (OPTION SERIES
030)
Specification
Characteristic
~~
SELECTIVE POWER
Frequency
Range
Carrier Power Range
Relative Measurement
ACCUraCy
Performance Limits
10
to
1300
MHz
+30 to
-20
dBm
+30
to -10
dBm
f0.5 dB
f0.5 dB
Conditions
12.5,25,
and 30 ldlz filters
carrier
noise filter
levels
>
-95
dBc;
12.5,25,
and
30 Iblz
filters
levels
>
-129
dBdHz;
carrier
noise filter
Description
This test checks the relative accuracy of the selective p o w e r measurement mode. The linearity of
the
IF rms detector (including the linearity of the internal dc voltmeter)
is checked
first. Linearity
is measured by feeding a
455
kHz
signal
directly
i n t o the IF via the front-panel connector. The level
is
set to
produce a
signal
that is near the upper measurement limit of the detector, a level reference
is set,
and
the range
settings
held.
The
signal
level
is
then decreased by precisely 5
dB,
and the drop
in displayed level is compared
against
the
decrease
in
level.
IF
gain
step accuracy is measured
by
increasing the attenuation of the attenuator
in 5
dB
steps and
comparing the displayed reading with
t h e
increase
in attenuation
Equipment
Signal Generator..
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HP
3336C
Procedure
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 i s written
for the latter case.
Detector Linearity
1. Set the
signal
generator to 455 k H z 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.
4-48.4
rev. 01 OCT92
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