Agilent Technologies E4406A VSA manual CALCulate:MARKers Subsystem

Language Reference

CALCulate Subsystem

Example:	Select the spectrum measurement.
	Use CALC:DATA4:PEAK? -40,10,FREQ to identify the
	peaks above −40 dBm, with excursions of at least 10 dB,
	in order of increasing frequency.

Query Results: Returns a list of floating-point numbers. The first value in the list is the number of peak points that follow. A peak point consists of two values: a peak amplitude followed by the its corresponding frequency (or time).

	If no peaks are found the peak list will consist of only
	the number of peaks, (0).
	The peak list is limited to 100 peaks. Peaks in excess of
	100 are ignored.
Remarks:	This command uses the data setting specified by the
	FORMat:DATA command and can return real 32-bit,
	real 64-bit, or ASCII data. The default data format is
	ASCII.
History:	Added in revision A.03.00 and later

CALCulate:MARKers Subsystem

Markers can be put on your displayed measurement data to supply information about specific points on the data. Some of the things that markers can be used to measure include: precise frequency at a point, minimum or maximum amplitude, and the difference in amplitude or frequency between two points.

When using the marker commands you must specify the measurement in the SCPI command. We recommend that you use the marker commands only on the current measurement. Many marker commands will return invalid results, when used on a measurement that is not current. (This is true for commands that do more than simply setting or querying an instrument parameter.) No error is reported for these invalid results.

You must make sure that the measurement is completed before trying to query the marker value. Using the MEASure or READ command, before the marker command, forces the measurement to complete before allowing the next command to be executed.

Each measurement has its own instrument state for marker parameters. Therefore, if you exit the measurement, the marker settings in each measurement are saved and are then recalled when you change back to that measurement.

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