Keysight M9421A - Page 963

3 WLAN Mode
3.6 Modulation Analysis Measurement
the trace that marker is on), and the X Axis value of the marker being moved (in the
same fundamental x-axis units).
Remote
Command
:CALCulate:EVM:MARKer:COUPle[:STATe] ON | OFF | 1 | 0
:CALCulate:EVM:MARKer:COUPle[:STATe]?
Example
:CALC:EVM:MARK:COUP ON
:CALC:EVM:MARK:COUP?
Notes In general, when coupling is turned on then all Normal or Delta markers with the same (or equivalent)
domain as the selected marker move in the same manner as the selected marker. See "More
Information " on page 963
Preset
OFF
(presets on Mode Preset and All Markers Off)
State Saved Saved in instrument state
More Information
Coupling is relative between markers on the same trace (so that their relative
positions in the domain are maintained). Coupling can be absolute between markers
on different traces that have equivalent domains. That is, they have the same
position in the domain, if possible. (As an example of equivalent domains,
demodulated symbol positions can be derived from time by using the current
symbol rate). When you move the selected marker, then others on related traces
track it. This enables you to correlate different measurement results. For example,
you can place a marker at a particular symbol time on an error vector magnitude
display, have tracking markers on the symbol table and pre-demod time trace
showing you the symbol value, and the actual time-varying signal value at the same
point in time.
Absolute coupling is performed only for the lowest numbered Normal or Delta
marker on each trace. All other markers on a trace couple relatively. When you turn
on marker coupling, the subset of markers that have the same domain as the
selected marker track it and all other markers remain at their current location. The
absolutely coupled markers within this subset is moved at this time to match the
domain setting of the selected marker, with the relatively coupled markers following
accordingly to maintain offsets within their respective traces. Those markers with
different domains remain at their current location. When you select a marker with a
different domain than the previously selected marker, the subset of markers with
that domain go through the same procedure.
Any marker that coupling would move outside its range of X values, remains at the
closest limiting value. If the coupled markers are on data that do not have the same
domain resolution, then they are positioned as close to each other as possible.
If markers change mode or trace, or trace data is changed below them, the coupling
rules are immediately applied to the new set.
963 WLAN Mode User's &Programmer's Reference