Keysight N9912A User Manual page 153

Data Analysis Features
Negative values search down from the TOP (MAX) of the response.
o
Positive values search up from the BOTTOM (MIN) of the notch.
o
If you first enter Negative, then Positive values, it may be necessary to
o
press Marker, then More, then
S21 of a filter with BW Markers and associated readout values.
The search criteria is -3 dB.
S11 of the same filter with same search criteria: -3 dB.
The same values would result from a search criteria of approximately +30.4 dB.
Press Enter and four markers are automatically created to find the first negative
or positive bandpass over the displayed frequency range.
Bandwidth Search can be used ONLY with Log Mag display format.
The following six values are displayed for Bandwidth Search:
 BW: Width of the filter. (marker 2 freq) minus (marker 3 freq).
 Center: Marker 4 frequency. Mathematical midpoint between marker 2 and
marker 3.
 Q: Center Frequency / Bandwidth.
 Loss: Marker 1 amplitude.
 Left: Frequency of marker 2 or 3 (to left of marker 1).
Markers All Off.
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