
7. IF Gain Uncertainty Test
7.
IF
Gain
Uncertainty
Tkst
Related
Adjustments
Step Gain and 18.4 MHz Local Oscillator Adjustments
21.4 MHz Bandwidth Filter Adjustments
Specification
Assuming the internal calibration signal is used to calibrate the
reference level at -10
dBm
and the input attenuator is fixed at 10
dB,
any changes in reference level from the -10
dB
setting will contribute
to IF gain uncertainty as shown:
Range
Uncertainty (uncorrected; 20 to 30°C)
0
dBm
to -55.9
dBm
Res BW 230 Hz, f0.6
dB;
Res BW = 10 Hz, f1.6
dB
-56.0
dBm
to -129.9
dBm
Res BW 230 Hz,
&l.O
dB;
Res BW = 10 Hz, f2.0
dB
Description
The IF gain steps are tested over the entire range from 0
dBm
to
-129.9
dBm
using an RF substitution method. The 10
dB,
2
dB,
and
0.1
dB
steps are compared against a calibrated signal source provided
by an HP 3335A Frequency Synthesizer.
FREOUENCY
SYNTHESIZER
SPECTRUM
ANALYZEA
.-.
IWCUT
Q
ADAPTER
Figure 2-9. IF Gain Uncertainty Test Setup
Performance Tests 2-21
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