Many
spectrum analyzers include tracking generators, but what is the purpose for them and how can they help with circuit measurements. Basically, tracking generators are variable, or swept, RF
generators that “track” with the spectrum analyzer sweep frequency. Some
tracking generators have a limited frequency sweep as compared with their
mating spectrum analyzer, so you need to know any frequency limitations in
advance. For instance, Siglent Spectrum Analyzers have built-in
tracking generators that sweeps the same frequency range as
the analyzer itself, while Rigol offers them as an option (-TG).
When activated, the tracking generator and spectrum analyzer function as a scalar network analyzer – that is, you may display |s21|, or amplitude, but not phase. While not quite as versatile as a true network analyzer, a scalar analyzer is useful for measuring filters, small-signal amplifiers, adapters, coax loss and attenuators.
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