Measurements and Math Functions 5
InfiniiVision 7000B Series Oscilloscopes User’s Guide 171
Extinction Ratio
The extinction ratio is the ratio of the "logic one" level amplitude (V top)
to the "logic zero" level amplitude (V base), in dB. That is, the extinction
ratio is: 10 log(Vtop/Vbase).
Maximum
Maximum is the highest value in the waveform display. The Y cursor
shows the value being measured.
Minimum
Minimum is the lowest value in the waveform display. The Y cursor shows
the value being measured.
Peak-Peak
The peak- to-peak value is the difference between Maximum and Minimum
values. The Y cursors show the values being measured.
Ratio
The Ratio measurement displays the ratio of the AC RMS voltages of two
sources, expressed in dB. Press the Settings softkey to select the source
channels for the measurement.
RMS
RMS (DC) is the root-mean- square value of the waveform.
RMS (dc) =
x
i
2
i 1=
n
n
----------------
where x
i
= value at ith point being measured
n = number of points in measurement interval
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