3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
In X-Series the marker itself has a width attribute, which you set using the Band
Span function. The marker shows “wings” that define the edges of the band in which
the Band Power is being measured. You only need one marker, not a pair of markers,
to completely define a Band Power function (making it possible to do Delta Band
Power, which PSA and ESA could not do).
Additional control functions of Band Left and Band Right are provided for the case
when you need to precisely set the band edges. Note that the marker itself always
remains centered in the band.
To map the old Span Pair and Band Pair/Delta Pair functions to the X-Series for
code compatibility, aliases and compatibility commands were added. Since Span
Pair and Band Pair/Delta Pair were primarily used for making band power
measurements, the aliases are provided for setting the parameters of a Band
Function. If the user was using the old commands for anything other than Band
Power these aliases will likely not yield compatible results.
For example, some users took advantage of the fact that the Band Pair commands
let you arbitrarily set the frequency (time) of a delta marker and its non-fixed
reference marker. In these cases, which had nothing to do with band Power, the new
commands will not be compatible. For these use cases the user must use two
markers and position each using the :CALC:MARK:X commands, since “marker
pairs” do not exist anymore.
Note that all the alias commands described below cause the specified marker to
become selected.
Spectrum Analyzer Mode User's &Programmer's Reference 347
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