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Model
8902A
Performance
Tests
Performance Test 10-Tuned RF Level (Using a Step Attenuator)
Specification
Characteristic
TUNED RF LEVEL
Frequency Range
Power Range
Relative Measurement
AcCuracy(1)
Detector Linearity
IF Range-teRange Error(2)
RF Range-to-Range Error
Frequency Drift Error
Noise Error(3)
Performance Limits
2 . 5
to
1300
MHz
0 to -127 dBm
0 to
-100
dBm
detector linearity
+
IF range-to-range error
+
RF range-twange e m
+
frequency drift error
+
noise error *1 digit
f0.02
dB
f0.04
dB
f0.02
dB/IF range change
f0.05
dB/IF range change
f0.04
dB/RF range change
f0.06
dB/RF range change
f0.05
dB/kHz frequency
drift from center of IF
f0.18
dB
using IF synchronous detector
using IF average
detector
IF synchronous detector
IF average detector
IF ranges 1 to
5
IF range
6
to 7
tuned RF level
RF power to tuned RF level
( l )
Accuracy is specified only at constant temperature and after RF range calibration is completed. Accuracy
is affected by the residual FM of the source under test. If the peak residual FM deviation is greater than
50
Hz, measured over a
30s
period in a
3
kHz bandwidth, tuned RF level measurements should be made
using
the
IF average detector
(30
kHz bandwidth) by using Special Function 4.4.
(2)
IF ranges
6
and
7
are used in automatic operation only for tuned RF level measurements below
approximately -1 10 dBm for the IF synchronous detector, and below approximately
-85
dBm for
the
IF
average detector.
(3)
Using the IF synchronous detector
and
for levels i-120 dBm,
o r
for levels i-110 dBm if Special Function
1 . 9
is implemented.
Description
This
test checks
the
relative accuracy of the
tuned
RF
level measurement mode for both the
I F '
synchronous
and
IF
average detectors.
The linearity
of the detectors (including the linearity
of
the
internal
dc
voltmeter) i s checked first. Linearity is measured
by
feeding a 50
MHz
signal through
a
calibrated step attenuator into the Measuring Receiver. The instruments are 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
attenuation
is
then increased
by
10
dB
and the
drop
in displayed level
i s
compared against
the increase in attenuation.
rev.13JUL87
4-35
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