LeCroy DDA 7 Zi series, Operator'S Manual

Page: 177 / 544

Operator's Manual
WP700Zi-OM-E-RevA
176
Parameter Description Definition Notes
undershoot, and ringing do
not affect measurement. Standard parameter.
Bit Rate
(bitrate) One over duration of one UI
measured on an eye
Available with SDA option.
Standard in SDA, SDA100G, and
WaveExpert scopes.
CMACp
PCI Express V TX-CM-ACp
and V RX-CM-Acp
Available with PCIE option.
Cycles
(cycles)
Determines number of cycles
of a periodic waveform lying
between cursors. First cycle
begins at first transition after
the left cursor. Transition
may be positive- or negative-
going.
Number of cycles of
periodic waveform
Standard parameter.
cyclic
Mean
(mean)
Cyclic mean: Computes the
average of waveform data.
Contrary to mean, computes
average over an integral
number of cycles, eliminating
bias caused by fractional
intervals.
Average of data values of
an integral number of
periods
Choose this parameter by selecting
Mean from the parameter table,
then touching the Cyclic checkbox.
Standard parameter.
cyclic
Median
(median)
Cyclic median: Computes
average of base and top
values over an integral
number of cycles, contrary to
median, eliminating bias
caused by fractional
intervals.
Data value for which 50%
of values are above and
50% below
Choose this parameter by selecting
Median from the parameter table,
then touching the Cyclic checkbox.
Standard parameter.
cyclic
RMS
(rms)
Cyclic root mean square:
Computes square root of
sum of squares of data
values divided by number of
points. Contrary to rms,
calculation is performed over
an integral number of cycles,
eliminating bias caused by
fractional intervals.
Where: v
i
denotes
measured sample values,
and N = number of data
points within the periods
found.
Choose this parameter by selecting
RMS from the parameter table, then
touching the Cyclic checkbox.
Standard parameter.
cyclic
Std dev
(sdev)
Cyclic standard deviation:
Standard deviation of data
values from mean value over
integral number of periods.
Contrary to sdev, calculation
is performed over an integral
number of cycles, eliminating
bias caused by fractional
intervals.
Where: v
i
denotes
measured sample values,
and N = number of data
points within the periods
found.
Standard parameter.
Choose this parameter by selecting
Std dev from the parameter table,
then touching the Cyclic checkbox.