Stanford Research Systems SR780, Operating Manual And Programming Reference

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4-48 Band Marker Menu
SR780 Network Signal Analyzer
Band Marker Menu
This menu is displayed when the active display Marker Mode is Band.
Modify Band
Select the Upper (2) or Lower (1) Band Marker to modify. Use the knob to move the
selected band. Use [Alt] knob to re-size the selected band.
The Marker Position display above the graph shows the left and right limits of the
selected band and the Band Power. The Band Power is the sum of the squared
magnitudes of all frequencies within the band (shown in Vrms). The label ‘1’ or ‘2’
preceding the Marker Position display denotes Lower or Upper Band Marker.
Command: BMKL (?) d, i {, j} or BMKR (?) d, i {, j}
Band Exclude
Select Band Exclusion for the Band Marker in the active display [none, 1from2, 2from1].
None means that the two bands are independent and include all bins within their left and
right limits.
1from2 means the bins in band 1 (Lower) are excluded from the band 2 (Upper) power.
The region where the two bands overlap is not included in band 2 (Upper).
2from1 means the bins in band 2 (Upper) are excluded from the band 1 (Lower) power.
The region where the two bands overlap is not included in band 1 (Lower).
For example, to measure THD+N, use the Lower (1) band to define a small region around
the fundamental and the Upper (2) band to define the total bandwidth of interest. Exclude
‘1from2’ so the Upper (2) band does not measure the fundamental. Choose the 2/(1+2)