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What are Absolute and Relative limit lines in the MS272xB the MS271xB spectrum analyzers, and the MT8222A BTS Master? When would I choose one over the other?
answer

An Absolute limit line is one that, when recalled from memory, returns to the frequency at which it was created. A Relative limit line, when recalled, is automatically centered on the spectrum analyzer's current center frequency. If your measurements are always at one frequency than using Absolute limit lines is sensible. If you make measurements at many different frequencies then Relative limit lines make your job easier because when you create a limit line (also called emission mask) once, you can use it at any desired frequency without having to recreate it each time.

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