Agilent Technologies 54621A User Manual page 218

Making Measurements
Making voltage measurements automatically
Digital channel voltage measurements
Automatic voltage measurements are not valid on digital channels on the
mixed-signal oscilloscope.
Measurement definitions
Amplitude
The Amplitude of a waveform is the difference between its Top and Base values.
The Y cursors show the values being measured.
Average
Average is the sum of the waveform samples divided by the number of samples
over one or more full periods. If less than one period is displayed, Average is
calculated on the full width of the display. The X cursors show what portion of
the displayed waveform is being measured.
Σ
x
i
Average = --------- -
n
Base
The Base of a waveform is the mode (most common value) of the lower part of
the waveform, or if the mode is not well defined, the base is the same as
Minimum. The Y cursor shows the value being measured.
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.
5-48
where x = value at ith point being measured
i
n = number of points in measurement interval