Anritsu FAQs

The choice of fixed or tracking markers come into play when you are using delta markers. When you select FIXED markers, the reference marker will be fixed at the amplitude it was at when you turn on the delta marker. This is useful when you want to track the tuning of a signal or filter.  The delta marker will show you the change in amplitude compared to the starting value.    The tracking marker will change amplitude as the amplitude of the signal changes. This is typically used when you want to know the relative amplitude at different offsets from a carrier and the amplitude of the carrier isn't fixed (such as an over-the-air measurement).