11.Residual FM, HP 8593EM, HP 8594EM, HP 8595EM, and HP 8596EM

11.Residual FM,

HP 8593EM, HP 8594EM, HP 8595EM, and HP 8596EM

This performance veri￿cation test must be performed with the EMC analyzer set in the spectrum analyzer mode.

This test measures the inherent short-term instability of the EMC analyzer LO system. With the analyzer in zero span, a stable signal is applied to the input and slope-detected on the linear portion of the IF bandwidth ￿lter skirt. Any instability in the LO transfers to the IF signal in the mixing process. The test determines the slope of the IF ￿lter in hertz per decibel (Hz/dB) and then measures the signal amplitude variation caused by the residual FM. Multiplying these two values yields the residual FM in hertz. The narrow bandwidth

test uses a 300 Hz span. This span is not speci￿ed, however, it is tested in \Frequency Span Accuracy."

There are no related adjustment procedures for this performance test.

Equipment Required

Signal generator

Cable, Type N, 183 cm (72 in)

Additional Equipment for Option 026

Adapter, APC 3.5 (f) to Type N (f)

Procedure

This performance veri￿cation test consists of two parts:

Part 1: Residual FM

Part 2: Narrow Bandwidth Residual FM

Performance Veri￿cation Tests 2-51