Tektronix MDO3012, User Manual

Page: 141 / 243

Display Waveform or Trace Data
The fi gure to the right shows the frequency
domain window’s trace indicator.
1. An RF trace indicator is placed at the
Reference Level.
2. A capital M appears if the maximum
trace is turned on.
3. A capital A appears if the average trace
is turned on.
4. A capital N appears if the normal trace
is turned on.
5. The small m appears if the minimum
trace is turned on.
Orange highlighting indicates the currently
selected trace. In the
fi gure to the right,
the small m , which stands for the minimum
trace, is highlighted. This indicates that the
minimum trace is currently selected.
Detection Types
The MDO3000 calculates FFTs with a 1,000 to ~2,000,000 point output, depending on the acquisition settings. It then
reduces that FFT output into a 750 pixel-wide display. This means that approximately 1 to 2,000 FFT points get compressed
into each pixel column. The MDO3000 gives you several choices as to how this compression is done. The choices are:
+peak, sample, average, and -peak. The
fi gure below illustrates how these detection methods work in a 5:1 compression,
where fi ve points are reduced to each pixel column.
1. FFT points
2. Decimation
3. +Peak: Uses the highest amplitude point
in each interval.
4. Sample: Uses the fi rst point in each
interval.
MDO3000 Series Oscilloscopes User Manual 119