Hw Averaging; Time Avg Num - Agilent Technologies X Series Manual

Complex Spectrum Measurement
Meas Setup
Notes
Preset
State Saved
Range
Initial S/W Revision

HW Averaging

Changes the number of time averages is to be made using hardware. This averaging is much faster than
the standard averaging done in software. The hardware averaging is done on the complex voltage time
trace data before any measurement application averaging is done. Both types of averaging (HW and SW)
can be done on the same measurement data.
When time averaging is being done in HW, each trace update represents N fresh data acquisitions
averaged together, where N is the number of averages. You cannot access the individual time data. Note
that in the spectrum measurement this averaging is done prior to the standard averaging done within the
application. Thus the yellow trace in this measurement shows the result of the time averaging.
Subsequent averaging is orthogonal to this hardware based time averaging and its result is seen as the
blue trace in this and other applications.
So it is possible to turn off the averaging within the application but still have the HW averaging set to a
certain number. In another words, turning averaging off within the measurement will not affect HW
averaging. If HW averaging needs to be turned off, simply set the HW Averaging parameter to 1.
Since it is time averaging, a trigger source something other than Free Run should be used to avoid
cancelling out the signal to be measured. It is most useful for a periodic signal with known periods.

Time Avg Num

Sets the number of HW averages to be executed per data acquisition.
Key Path
Mode
Remote Command
Example
Notes
244
You must be in the IQ Analyzer (Basic) mode to use this command. Use
INSTrument:SELect to set the mode.
Pwr Avg (RMS) = RMS
Log Pwr Avg (Video) = LOG
Voltage Avg = SCALar
Maximum = MAXimum
Minimum = MINimum
LOG
Saved in instrument state.
Pwr Avg(RMS) | Log-Pwr Avg(Video) | Voltage Avg | Maximum | Minimum
Prior to A.02.00
Meas Setup
BASIC
[:SENSe]:SPECtrum:AVERage:TACount <integer>
[:SENSe]:SPECtrum:AVERage:TACount?
SPEC:AVER:TAC 10
SPEC:AVER:TAC?
Not available when using Option B25.