HP 8901B Operation And Calibration Manual page 384

Performance Tests
Model 8901B
Performance Test 11
HIGH-SELECTIVITY GAIN (OPTION SERIES 030)
-
2642A AND ABOVE
Specification
Characteristic
SELECTIVE
POWER
Frequency Range
Carrier Power Range
Relative Measurement
Accuracy
Performance
Limits
10
to 1300 MHz
t-30 to -20
dBm
+30
to
-10 dBm
f0.5 dB
f0.5 dB
Conditions
12.5, 25, and 30 kHz filters
carrier noise filter
levels
>
-95
dBc; 12.5, 25,
and 30
kHz
filters
levels
> -1 29
dBc/Hz; carrier noise filter
Description
This test checks the relative accuracy of the selective power 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 into 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 the 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
is
written
for the latter case.
Detector Linearity
1. Set the signal generator to
455
kHz CW at
+3 a m .
Connect the signal generator's output to the
Modulation Analyzer's INPUT. Allow the equipment to warm up at least one-half hour.
4-40
Performance Test
1 1
rev.lOJUI.87