Agilent Technologies Signal Analyzer N9030a - Manual (Page 792)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Meas Setup
The equation for trace averaging on the log-pwr scale is shown below, where K is the number of
averages accumulated. (In continuous sweep mode, once K has reached the Average/Hold Number,
K stays at that value, providing a continuous running average.)
New avg = ((K–1)Old avg + New data)/K
Assumes all values in decibel scale.
Key Path Meas setup, Average Type
Example AVER:TYPE LOG
Notes See “ "Average Type" on page 789 ”
Couplings See “ "Auto" on page 791 ”
Readback Log-Pwr (Video)
Initial S/W Revision Prior to A.02.00
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 average power of complex signals. This scale is sometimes called RMS because the
resulting voltage is proportional to the square root of the mean of the square of the voltage.
In the equation for averaging on this scale (below), K is the number of averages accumulated. (In
continuous sweep mode, once K has reached the Average/Hold Number, K stays at that value,
providing a running average.)
New avg = 10 log ((1/K)((K–1)(10Old avg/10)+10New data/10))
Equation assumes all values are in the decibel scale.
Key Path Meas setup, Average Type
Example AVER:TYPE RMS
Notes See "Average Type" on page 789
Couplings See "Auto" on page 791
Readback Pwr (RMS)
Initial S/W Revision Prior to A.02.00
792 Remote Language Compatibility Measurement Application Reference