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1038
Meas
NOTE If the original trace data is in dB, 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 in dB, 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 (in dB/ 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)
• RMS - returns a single value that is the average power on a root-mean-squared voltage scale
(arithmetic rms) of the data point values for the specified region(s) of trace data. See the following
equation.
NOTE For I/Q trace data, the rms of the magnitudes of the I/Q pairs is returned. See the
following equation.
This function is very useful for I/Q trace data. However, if the original trace data is
in dB, this function returns the rms of the log values which is not usually needed.
Equation 4
RMS Value of Data Points for Specified Region(s)
Σ
Xi
1
_
n
Xi
∈ region(s)
MEAN =
vsd27-1
Σ
|Xi|
1
_
n
Xi
∈ region(s)
MEAN =
vsd27-2
Σ
1
_
n
Xi ∈ region(s)
DME = 10 x log
10
vsd27-3
10
Xi
10