Keysight E4990A - Page 170

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Definitions of Parameters in the Trace Bandwidth Analysis
Table below shows the definition of each parameter in the trace bandwidth
analysis.
Parameter Definition
Cutoff point
Two points having the predefined measurement
parameter value that are searched for and detected
from the main marker position to both ends on the
trace. You define the measurement parameter value
of the cutoff points by selecting, assuming that the
measurement parameter value of the main marker
position is MKRVAL, , ,
or a user entered value (fixed value). At
the detected cutoff points, the sub-
markers numbered
2 and 3 will be placed.
Bandwidth:
Indicates the interval of sweep parameter values at
two cutoff points. This definition does not depend on
the marker mode.
Center:
Indicates a midpoint between the sweep parameter
values at two cutoff points. It serves as a relative
value with reference to the fixed marker only when
the fixed marker is present.
Q
Indicates value Q obtained from two cutoff points
(Center/Width).
Peak:
Indicates the measurement parameter value at the
position of the main marker (marker 0). However, it
indicates a relative value with reference to the fixed
marker only when the fixed marker is present. When
the main marker is moved to the peak by using the
peak search function, that peak is displayed at this
position.