Capturing Pulses In Zero Span - Test Equipment Plus Signal Hound USB-SA44B User Manual

T A K I N G M E A S U R E M E N T S
1. Click the ZERO SPAN button. A popup should appear with the Zero Span
controls.
2. Select your desired "Resolution Bandwidth." This is equivalent to the
intermediate frequency, or IF, Bandwidth.
3. Select your desired "Video Bandwidth." This will smooth out the zero span
data. This must be set to a value larger than your demodulated audio
bandwidth.
4. If you want to use video triggering, Check the appropriate box and fill out
the trigger controls
a. The trigger level is the approximate minimum power, in dBm, that
will trigger the sweep.
b. The trigger position sets the amount of pre-trigger data to display, as
a percent of sweep time. This allows you to see data both before and
after the trigger event.
5. Enter your Sweep Time, in milliseconds. This becomes your X-Axis on the
graticule display.
6. Select amplitude vs. time or Frequency vs time, to view and measure AM or
FM, respectively
You may use the markers as above to take basic measurements. SINGLE sweep will
make these measurements much easier to make.
3.2.1

Capturing Pulses in Zero Span

To capture a pulse, click ZERO SPAN as before, then click VIDEO trigger. You
must supply the minimum amplitude to trigger the sweep. When you begin a video-
triggered sweep, data is collected continually in the background. When a signal with
sufficient amplitude is detected, the software continues to collect data until the sweep is
complete.
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