Teledyne LeCroy WaveJet 300A Series Getting Started Guide - Manual (Page 53)

WaveJet 300A Series
52
WJ-A-GS-E Rev A
PARAMETER MEASUREMENTS
Waveform analysis typically begins with the measurement of parameters. Parameter
measurement tools determine a wide range of waveform properties. Use them to
automatically calculate many attributes of your waveform, like rise time, rms voltage,
and peak-to-peak voltage, for example.
You can make common measurements on one or more waveforms. Parameter values
are displayed below the grid.
Measure Modes
Standard Vertical Parameters

Maximum -- Measures highest point in waveform. Unlike top, it does not
assume the waveform has two levels.

Minimum -- Measures the lowest point in a waveform. Unlike base, it does not
assume the waveform has two levels.

Peak-Peak -- Difference between highest and lowest points in the waveform.

RMS -- Root Mean Square of data between the cursors -- about the same as
sdev for a zero-mean waveform.

Cycle RMS -- Cyclic root mean square: Computes the square root of the sum of
squares of data values divided by number of points. Contrary to rms,
calculation is performed over an integer number of cycles, eliminating bias
caused by fractional intervals.

Mean -- Average of the data for a time domain waveform. Computed as
centroid of distribution for a histogram.

Cycle Mean -- Computes the average of the waveform data. Contrary to mean,
computes the average over an integer number of cycles, eliminating bias
caused by fractional intervals.

Top -- Higher of two most probable states, the lower being base; it is
characteristic of rectangular waveforms and represents the higher most
probable state determined from the statistical distribution of data point values in
the waveform.

Base -- Lower of two most probable states (higher is top). Measures lower level
in two-level signals. Differs from min in that noise, overshoot, undershoot, and
ringing do not affect measurement.