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Making Measurements
Making voltage measurements automatically
RMS
RMS (dc) is the root-mean-square value of the waveform over one or more full
periods. If less than one period is displayed, RMS (dc) average is calculated on
the full width of the display. The X cursors show what interval of the waveform
is being measured.
Top
The Top of a waveform is the mode (most common value) of the upper part of
th e w avef or m, or if th e mod e i s not well de fi ne d, th e t op is th e s am e a s M axi mu m.
The Y cursor shows the value being measured.
Using delayed sweep to isolate a pulse for Top measurement
The following figure shows how to use delayed sweep to isolate a pulse for a Top
measurement.
Isolating area for Top measurement
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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