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Meas
in each frame. The command can also be used to identify the best curve fit for the data.
• BLOCk or block data - returns all the data points from the region of the trace data that you specify.
For example, it could be used to return the data points of an input signal over several timeslots,
excluding the portions of the trace data that you do not want. (This is x,y pairs for trace data and I,Q
pairs for complex data.)
• CFIT or curve fit - applies curve fitting routines to the data. <soffset> and <length> are required to
define the data that you want. <roffset> is an optional parameter for the desired order of the curve
equation. The query will return the following values: the x-offset (in seconds) and the curve
coefficients ((order + 1) values).
MIN, MAX, MEAN, DME, RMS, RMSC, SAMP, SDEV and PPH return one data value for each
specified region (or <length>) of trace data, for as many regions as possible until you run out of trace
data (using <roffset> to specify regions). Or they return the number of regions you specify (using
<rlimit>) ignoring any data beyond that.
• MINimum - returns the minimum data point (y value) for the specified region(s) of trace data. For I/Q
trace data, the minimum magnitude of the I/Q pairs is returned.
• MAXimum - returns the maximum data point (y value) for the specified region(s) of trace data. For
I/Q trace data, the maximum magnitude of the I/Q pairs is returned.
• MEAN - returns a single value that is the arithmetic mean of the data point values (in dB/ dBm) for
the specified region(s) of trace data. For I/Q trace data, the mean of the magnitudes of the I/Q pairs is
returned. See the following equations.
Remote Command: :CALCulate:DATA<n>:COMPress?
BLOCk|CFIT|MAXimum|MINimum|MEAN|DMEan|RMS|RMSCubed|SAMP
le|SDEViation|PPHase
[,<soffset>[,<length>[,<roffset>[,<rlimit>]]]]
Example: To query the mean power of a set of GSM bursts:
Supply a signal that is a set of GSM bursts.
Select the IQ Waveform measurement (in IQ Analyzer Mode).
Set the sweep time to acquire at least one burst.
Set the triggers such that acquisition happens at a known position relative to a
burst.
Then query the mean burst levels using, CALC:DATA2:COMP?
MEAN,24e–6,526e–6 (These parameter values correspond to GSM signals,
where 526e–6 is the length of the burst in the slot and you just want 1 burst.)
Notes: The command supports 5 parameters. Note that the last 4
(<soffset>,<length>,<roffset>,<rlimit>) are optional. But these optional
parameters must be entered in the specified order. For example, if you want to
specify <length>, then you must also specify <soffset>. See details below for
a definition of each of these parameters.
This command uses the data in the format specified by FORMat:DATA,
returning either binary or ASCII data.
Initial S/W Revision: Prior to A.02.00