Keysight Technologies N9321C, User Manual

Page: 176 / 220

Key Reference
Trace/Det
168
Detector
(detector type)
Softkey presents a submenu to select a specific detector type, or
allows the analyzer to select the appropriate detector for a
particular measurement.
Regarding detectors, it is important to understand what is a trace
“bucket”. For every trace point displayed, there is a finite time
during which the data for that point is collected. The analyzer looks
at all of the data collected during that time and present a single
point of trace data based on the detector mode. The interval during
which the data for that trace point is being collected, is called the
“bucket” .
Thus a trace is more than a series of single points. It is actually a
series of trace “buckets”. The data may be sampled many times
within each bucket.
•
Average
displays the power average in the bucket.
•
Sample
displays the instantaneous level of the signal at the
center of the bucket represented by each display point.
•
QuasiPeak
displays a weighted, sample-detected amplitude
using specific, charge, discharge, and meter time constants
derived from the legacy behaviors of analog detectors and
meters.
•
Positive Peak
displays the max. of the signal in the bucket.
•
Negative Peak
displays the min. of the signal in the bucket.
The detector in use is indicated on the left side of the display. A “
#
”
will appear next to it if the detector has been manually selected.
Key access:
Shift > Dsip > More
Positive
Peak
Obtains the maximum video signal between the last
display point and the present display point and stores
this value in memory. It’s used primarily when
measuring sinusoidal components. When
Positive
Peak
is selected, “
Peak
” appears in the upper-left
corner.
Negative
Peak
Is a peak detector, but selects the minimum video
signal value. This detection should not be used to
measure the accurate amplitude. “
NPk
” also appears
in the upper-left corner, When
Negative Peak
is
selected.