LeCroy DDA-3000A, Руководство оператора

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186
WM-OM-E Rev I
cyclic
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
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
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.
Choose this parameter
by selecting
Std dev
from the parameter
table, then touching the
Cyclic checkbox.
Standard parameter.
DCD Amount of jitter due to duty cycle
distortion Available with SDA and
ENET options.
Standard in SDA and
WaveExpert scopes.
DDj Amount of data dependent jitter in a
signal Available with SDA
option.
Delay Time from trigger to transition:
Measures time between trigger and
first 50% crossing after left cursor.
Can measure propagation delay
between two signals by triggering
on one and determining delay of
other. Time between trigger and
first 50% crossing after left
cursor Standard parameter.