LeCroy SDA, Operator'S Manual

Page: 156 / 397

Parameter Description Definition Notes
Area Integral of data: Computes area of
waveform between cursors relative
to zero level. Values greater than
zero contribute positively to the
area; values less than zero
negatively. Sum from first to last
of data multiplied by
horizontal time
between points Standard parameter..
Avg Power Average power of the waveform Available with SDA and SDM
options.
Standard in SDA100G scopes.
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. Value of most
probable lower state On signals not having two
major levels (triangle or saw-
tooth waves, for example),
returns same value as min.
Standard parameter.
Bit Rate 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 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 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.
Area Integral of data: Computes area of
waveform between cursors relative
to zero level. Values greater than
zero contribute positively to the
area; values less than zero
negatively. Sum from first to last
of data multiplied by
horizontal time
between points Standard parameter..
cyclic
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.
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