10 Monitor Spectrum Measurement
Meas
• 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 (indB/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.
•
If the original trace data is indB, this function returns the arithmetic mean of those log values, not log of
the mean power which is a more useful value. The mean of the log is the better measurement technique
when measuring CW signals in the presence of noise. The mean of the power, expressed indB, is useful in
power measurements such as Channel Power. To achieve the mean of the power, use the RMS option.
Equation 1
Mean Value of Data Points for Specified Region(s)
where Xi is a data point value, and n is the number of data points in the specified region(s).
Equation 2
Mean Value of I/Q Data Pairs for Specified Region(s)
where |Xi| is the magnitude of an I/Q pair, and n is the number of I/Q pairs in the specified region(s).
• DMEan - returns a single value that is the mean power (indB/dBm) of the data point values for the
specified region(s) of trace data. See the following equation:
Equation 3
DMEan Value of Data Points for Specified Region(s)
772 EMI Receiver Mode Reference
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