Display Wavefor
morTraceData
The figure to the right shows the frequency
domain window’s trace indicator.
1. An RF trace indicator is placed at the
Reference Lev
el.
2. A capital M app
ears if the maximum
trace is turned on.
3. A capital A appears if the average trace
is turned on.
4. A c apital N appears if the normal trace
is turned on
.
5. The small m a
ppears if the minimum
trace is turned on.
Orange highlighting indicates the currently
selected t
race. In the figure to the right,
the sma ll m, which stands for the minimum
trace, is highlighted. This indicates that the
minimum t
race is currently selected.
Detection Types
The MDO4000 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 1,000 pixel-wide display. This means that appr oximately 1 to 2,000 FFT points get
compressed into each pixel column. The MDO4000 gives you several choices as to how this compression is done. The
choices are: +peak, sample, average, and -peak. The figure below illustrates how these detection methods work in a 5:1
compression, where five 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 first point in each
interval.
112 MDO4000 Series Oscilloscopes User Manual
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