Det/Demod - Agilent Technologies ESA Series User's/Programmer's Reference

Front-Panel Key Reference

Det/Demod

Det/Demod
Accesses the menu keys controlling detector functions, demodulation
functions, and the speaker. FM demod is available with options 106,
BAA or AYQ installed.
The FM Demod internal circuitry must be aligned before use. Press
NOTE
System
Selects a specific detector, or uses the system to pick the appropriate
Detector Auto Man
detector (through
When discussing detectors, it is important to understand the concept of
a trace "bucket." For every trace point displayed, there is a finite time
during which the data for that point is collected. The analyzer has the
ability to look at all of the data collected during that time and present a
single point of trace data based on the detector mode. We call the
interval during which the data for that trace point is being collected,
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.
When the detector choice is
Average (On)
functions, trace functions, and the trace averaging function. If a marker
function or measurement is running, the
either
manually selected instead of
to other analyzer settings.
• Average - displays the average of the signal within the display
• Sample - displays the instantaneous level of the signal at the center
• Peak - displays the maximum of the signal within the bucket.
• Negative Peak - displays the minimum of the signal within the
Neither average nor sample detectors measure amplitudes of CW
signals as accurately as peak, because they may not find a spectral
component's true peak. However, they both measure noise better
without the positive bias of peak detection.
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:
66
, ,
Alignments Align Now
) for a particular measurement.
Auto
) changes the detector. The
or . When one of the detectors (such as
Average Sample
bucket. Set the averaging method with
of the bucket represented by each display point.
bucket.
Det/Demod
, .
FM Demod
, selecting trace averaging (
Auto
choice depends on marker
Auto
choice of detector is
Auto
, that detector is used without regard
Auto
Avg Type
,
BW/Avg
) is
Average
(Video or RMS).
Chapter 2