L3Harris Narda SignalShark User Manual page 142

SignalShark User Manual
• Inf. Mx/Mn: Tap to switch between On and Off
• Third Detector: Tap to select from dropdown menu: -Pk, Avg, or Smp
• Active Trace: Tap to select from dropdown menu: +Pk, Avg, or RMS
To select the traces to be displayed:
You selected the desired view.
1. Tap the Traces button.
2. Tap a button to switch the trace On / Off.
3. Tap the Enable All button to display all traces.
4. Tap the Disable All button to hide all traces. At least the RMS trace remains on as
default.
5. To set the third director, tap the Third Detector button.
6. Press the Esc key to close the menu.
BACKGROUND
There are three main detectors which compress all spectra occurring in the
measurement time to one spectrum (per measurement time), while the third detector
can have different functions.
Basis Traces:
• Detector 1: +Pk (Plus Peak)
• Detector 2: RMS
• Detector 3: The function of the third detector can be set via the context menu as
follows:
– -Pk (Minus Peak)
– Avg (Average)
– Smp (Sample)
In order to be able to view very fast signals with the naked eye (the measurement time
is partly 10 ms), there is a downstream compression for these detectors, which the user
can display as an additional trace.
The compression time is determined by the Scan Count. After the Scan Count has
elapsed, the signal then decays exponentially.
Example:
• Measurement Time: 10 ms
• Scan Count: 300
• Trace: MxP
Over the time of 10 ms x 300 = 3 s, the data of the +Pk (Plus Peak) become
summarized in a Trace (in this case, the maximum values that have occurred during this
time). If the signal would no longer be present after the 3 s, the Trace would slowly fade
away. In this way, short pulses, for example, can be made visible.
Calculated traces:
• Detector 1: MxP (Maximum of Plus Peak)
• Detector 2:
– MxR (Maximum of RMS)
– AvR (Average of RMS)
142