Scale Fidelity (Linear) - HP 8568B Installation And Verification Manual

4. Scale Fidelity
(Linear)
Specification
Related Performance
Description
5-14 Operation Verification
Amplitude Fidelity Test
A signal source of known amplitude is connected to the spectrum
analyzer and the analyzer is adjusted for a reference. The signal
source is stepped down from -10 dB to -30 dB in 10 dB steps and the
amplitude of the displayed signal measured using the marker function.
This measured value is used to calculate the percent error from the
reference level established.