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Common Measurement Settings

R&S

FSW

415User Manual 1173.9411.02 ─ 43

Signal ID function

Two sweeps are performed alternately. Trace 1 shows the trace measured on the

upper side band (USB) of the LO (the test sweep), trace 2 shows the trace measured

on the lower side band (LSB), i.e. the reference sweep.

Figure 8-17: Signal identification function (Signal ID) with optional external mixer

The reference sweep is performed using an LO setting shifted downwards by 2*IF/

<Harmonic order>. Input signals in the desired sideband that are converted using the

specified harmonic are displayed in both traces at the same position on the frequency

axis. Image signals and mixer products caused by other harmonics are displayed at

different positions in both traces. The user identifies the signals visually by comparing

the two traces.

Since the LO frequency is displaced downwards in the reference sweep, the conver-

sion loss of the mixer may differ from the test sweep. Therefore the signal level should

only be measured in the test sweep (trace 1).

Auto ID function

The Auto ID function basically functions like Signal ID function. However, the test and

reference sweeps are converted into a single trace by a comparison of maximum peak

values of each sweep point. The result of this comparison is displayed in trace 3 if "Sig-

nal ID" is active at the same time. If "Signal ID" is not active, the result can be dis-

Data Input and Output

R&S FSW Series User Manual

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