Measurement setups Select a communications measurement
Behavior
Measurements are updated approximately three times a second (or less for long record lengths).
Measurements are calculated after each acquisition. You can display up to eight automatic measurements.
TIP. Most Comm measurements require either WfmDB or FastAcq mode.
You may need to select Infinite Persistence display mode (see page 169) to accumulate enough data
for the Comm measurement to work.
NOTE. You c
an also select the individual measurements directly from the Measure menu Comm submenu.
What do you want to do next?
Learn about taking amplitude measurements. (see page 270)
Learn about taking timing measurements. (see page 273)
Learn about other measurements. (see page 282)
Learn more about the measurement list. (see page 870)
Learn
more about the measurement controls.
(see page 286)
Extinction Ratio
Extinction ratio is the ratio of eye top to base. This measurement is only valid when the acquisition
mode is set to WfmDB, FastAcq is enabled, or the measurement is taken on a reference waveform
saved in FastAcq mode.
Ext Ratio = pTopMean/pBaseMean
Extinction Ratio Percent
Ex
tinction ratio percent is the ratio of eye base to top expressed as a percentage.
This measurement is only valid when the acquisition mode is set to WfmDB, FastAcq is enabled, or
t
he measurement is taken on a reference waveform save d in FastAcq mode.
Ext Percent = 100 × (pTopMean/pBaseMean).
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 279
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