If Gain Uncertainty Test; If Gain Uncertainty Test Setup - HP 8566B Adjustment Manual

Step Gain and 18.4 MHz Local Oscillator Adjustments
21.4 MHz Bandwidth Filter Adjustments
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
0 dBm to -55.9 dBm
-56.0 dBm to -129.9 dBm Res BW 230 Hz, &l.O dB; Res BW = 10 Hz, f2.0 dB
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.
Figure 2-9. IF Gain Uncertainty Test Setup

7. IF Gain Uncertainty Test

Uncertainty (uncorrected; 20 to 30°C)
Res BW 230 Hz, f0.6 dB; Res BW = 10 Hz, f1.6 dB
SPECTRUM ANALYZEA
ADAPTER
Performance Tests 2-21