Chapter 6 6-63
Front-Panel Key Reference
Peak Search
NOTE For example, N dB Points can be used to measure the 3 dB bandwidth
of a filter in a transmission test with the tracking generator. The
default value is -3 dB. Possible values range from −1.00 dB to
−80.00 dB. You can enter values to a resolution of 0.01 dB using the
numeric key pad or 0.1 dB using the knob.
The N dB function follows the active marker. If you turn on a marker
after N dB Points has been activated, the arrows will follow that
marker. If the marker associated with N dB Points moves, the arrows
will move with the marker unless there is no data N dB below the
marker. Key Access:
Search, More 1 of 2
Search Param Accesses the following menu keys: Key access: Search, More 1 of 2
Peak Excursn Sets the minimum amplitude variation of signals that
the marker can identify as a peak. If a value of 10 dB is
selected, the marker moves only to peaks that rise and
fall more than 10 dB above the peak threshold value.
Pressing
Preset or turning on power resets the
excursion to 6 dB, and the threshold to 90 dB below the
reference level.
NOTE Two signal peaks, which are so close together that the amplitude drop
between them is less than the peak-excursion value, are not recognized
as two peaks. A signal peak is recognized only if it has a peak excursion
drop above the noise floor, on both sides of the signal.
When the peak excursion value is 6 dB or higher, the
marker-peaking functions do not recognize signals less
than the peak excursion value above the noise floor. To
correct this, when measuring signals near the noise
floor, the excursion value can be reduced even further.
To prevent the marker from identifying noise as
signals, reduce the noise floor variance to a value less
than the peak-excursion value by reducing the video
bandwidth or by using video averaging. Key access:
Peak Search, More 1 of 2, Search Param
Peak
Threshold Sets the minimum amplitude of signals that the
marker can identify as a peak. For example, if a value
of 90 dBm is selected, the marker moves only to peaks
that rise and fall more than the peak excursion value
above -90 dBm. Pressing
Preset or turning the Power on
resets the excursion to 6 dB and the threshold to −90
dBm.
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