LeCroy DDA 7 Zi series, Operator'S Manual

Page: 414 / 544

WavePro 7Zi
413
WP700Zi-OM-E-RevA
AltNcycle
Timing of the transitions in the data waveform is measured for each transition and plotted as a function of the
number of unit intervals over which the timing is measured. The
N-Cycle dialog is used to control how this
measurement is performed, and the diagram and table below describe the function in detail. The N-cycle plot
displays the mean or standard deviation of the edge placement in the waveform relative to each other (data to
data) or to a reference clock (clock to data).
The N-cycle plot displays the mean or standard deviation of the distribution of timing for edges spaced n UI apart
as a function of n. The value of n can vary from 1 to some maximum value, including all intermediate values, or
can be synchronous with the transitions in a repeating pattern.
AltNcycle Control Summary
Control Values Description
Synch to
pattern
On/off
Synchronizes the measurement to a repeating data pattern (if present) in the
signal when this control is checked. The timing is measured between the first
transition in the pattern and each subsequent transition. For an N-bit pattern,
each transition is measured in succession and measurements are accumulated
by shifting the measurement window by N bits and repeating the measurement.
Ver.
Output
Mean, sdev,
DDmean,
DDsdev
These are the vertical units of the measurement. Mean gives the average
position of edges for each value of N relative to a reference clock at the bit rate.
Sdev gives the standard deviation for each edge for each value of N relative to
the reference clock. DDmean gives the mean value of each edge relative to the