HP 8568B, Performance Tests And Adjustments Manual, Page: 55 / 313

10. IF Gain Uncertainty
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
and the input attenuator is fixed at 10
any changes in reference level from the -10 setting will contribute
to IF gain uncertainty as shown:
Range
Uncertainty (uncorrected; 20
0 to -55.9 Res BW Hz, Res BW = 10 Hz,
-56.0 to -129.9 Res BW Hz, Res BW = 10 Hz,
Description
The IF gain steps are tested over the entire range from 0 to
-129.9 using an RF substitution method. The 10 2 and
0.1 steps are compared against a calibrated signal source provided
by an HP Frequency Synthesizer.
SIGNAL GENERATOR
ADAPTER
SPECTRUM ANALYZER
STEP ATTENUATOR
HP
- -
- -
STEP ATTENUATOR
HP
ADAPTER
Figure 2-17. IF Gain Uncertainty Setup
Performance Tests 2-33