Agilent Technologies Signal Analyzer N9030a - Manual (Page 831)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Meas Setup
skirts. There is one pixel between the arrow and the trace
.
N dB Points can be used to measure the bandwidth of a signal; it is commonly used in
conjunction with a tracking generator to measure filter bandwidths.
In one of the common use cases, the marker is placed on a peak, and the arrows are displayed N
dB down the skirt from the marker on either side of the peak. The N dB value and the frequency
difference between the two arrows is displayed around the arrow as shown in the figure above.
Normally this displays on the right arrow, but if this would place any part of the text offscreen to
the right then it displays on the left arrow.
If the analyzer is unable to find data that is N dB below the marker on either side of the marker,
the arrows are displayed at the indicator point of the marker, no value (---) will be displayed as
the result and –100 Hz returned remotely (see figure below):
Some sample N dB scenarios are shown below to illustrate how the function works in various
cases. In each case, the two-headed blue arrow represents N dB of amplitude.
Remote Language Compatibility Measurement Application Reference 831