Stanford Research Systems SR785, Operating Manual And Programming Reference

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4-62 Sideband Marker Menu
SR785 Dynamic Signal Analyzer
Only those sidebands within the measurement span which are identified by the Sideband
Markers contribute to the Sideband Power calculations. The sideband identification
works best if the fundamental frequency is a bin frequency. If the fundamental is off-bin,
then it is best to use the Flattop window to broaden all of the peaks.
Each display has its own Number Of Sidebands. This entry field can be linked to both
displays using the [Link] key.
Command: SDBN (?) d {, i}
Display
Select the Harmonic and Sideband Display for the active display. The marker display can
read the position of the fundamental or any identified harmonic or sideband.
For sideband marker, the value ranges from 0 (fundamental) to plus and minus the
Number of Sidebands. The first lower sideband is identified as #-1, the first upper
sideband is #1, etc.
The small square marker will move to the selected harmonic or sideband. If the selection
is not within the measurement span, the marker will move to the highest or lowest
measured frequency (which will be reported as the marker position).
Each display has its own harmonic/sideband display. This entry field can be linked to
both displays using the [Link] key.
Command: HDSP (?) d {, i}
Readout Mode
Select the Readout Mode for the Harmonic and Sideband Marker of the active display
[Absolute, Relative]. The Marker Position Display shows the amplitude of the
Fundamental or any identified Harmonic or Sideband in either Absolute units or Relative
to the fundamental.
Relative Mode reports the amplitude of the selected harmonic or sideband relative to the
fundamental. The marker amplitude units are dBFundamental. The frequency is always
absolute.
Each display has its own Readout Mode. This entry field can be linked to both displays
using the [Link] key.
Command: HRDO (?) d {, i}
Sideband Ratio
This menu box displays the Sideband Ratio of the active display. The sideband power is
the sum of the squared magnitudes of the sidebands. Only those sidebands within the