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10. IF Gain Uncertainty
Test
10. IF Gain
Uncertainty Test
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
-
30°C)
0 dBm to -55.9 dBm Res BW
230
Hz,
f0.6
dB;
Res BW = 10 Hz,
h1.6
dB
-56.0 dBm to -129.9 dBm
Res BW
230
Hz,
f1.0
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.
SIGNAL GENERATOR
RF
OUTPUT
ADAPTER
SPECTRUM ANALYZER
SIGNAL
INPU
STEP ATTENUATOR
HP
355CbHE9
--
--
STEP ATTENUATOR
HP
355C-HZ5
ADAPTER
Figure 2-17. IF Gain Uncertainty
Test
Setup
Performance Tests 2-33