Technical data

102 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
4 BW/Avg
because the resulting voltage is proportional to the square root of the mean of the square of
the voltage. When this type of averaging is selected, PAvg appears on the left side of the
display.
In the equation for averaging on this scale (below), N is the number of averages
accumulated. (In continuous sweep mode, once N has reached the Average Number, N
stays at that value.)
Assumes all values in dB.
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 RMS
Voltage Avg
In this Average type, all filtering and averaging processes work on the voltage of the
envelope of the signal. This scale is good for observing rise and fall behavior of AM or
pulse-modulated signals such as radar and TDMA transmitters, but its response to
noise-like signals is 1.049 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,
VAvg appears on the left side of the display.
In the equation for averaging on this scale (below), N is the number of averages
accumulated. (In continuous sweep mode, once N has reached the Average Number, N
stays at that value.)
Assumes all values in dB.
New Avg 10
N1–()10×
Old Avg
10
------------------
10
New data
10
----------------------
+
N
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New Avg 20
N1–()10×
Old Avg
20
------------------
10
New data
20
----------------------
+
N
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⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎛⎞
log×=