Technical data

BW/Avg 4
Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 101
[:SENSe]:AVERage:TYPE:AUTO?
Example:
AVER:TYPE RMS Sets Power (RMS) averaging
AVER:TYPE SCAL Sets Voltage averaging
AVER:TYPE LOG Sets Log-Power (video) averaging
Log-Pwr Avg (Video)
Selects the logarithmic (decibel) scale for all filtering and averaging processes. This scale is
sometimes call “Video” because it is the most common display and analysis scale for the
video signal within the N8201A. This scale is excellent for finding CW signals near noise,
but its response to noise-like signals is 2.506 dB lower than the average power of those
noise signals. This is compensated for in the Marker Noise function. When this type of
averaging is selected, LgAv appears on the left side of the display.
The equation for trace averaging on the log-pwr scale is shown below, where N is the
number of averages accumulated. (In continuous sweep mode, once N has reached the
Average Number, N stays at that value, providing a running average.)
Assumes all values in decibel scale.
Key Path:
BW/Avg, Avg/VBW Type
or
Auto Couple, Avg/VBW Type
Remote Command:
See“Avg/VBW Type" on page 100.
Example:
AVER:TYPE LOG
Pwr Avg (RMS)
In this average type, all filtering and averaging processes work on the power (the square of
the magnitude) of the signal, instead of its log or envelope voltage. This scale is best for
measuring the true time power of complex signals. This scale is sometimes called RMS
New avg
N 1–()Oldavg Newdata+
N
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