LeCroy LSA1000, Руководство оператора

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C – 8
Appendix C
Parameter — Description Definition Notes
first Indicates value of horizontal axis at left
cursor. Horizontal axis
value at left
cursor
(See Fig. C
–2)
Indicates location of left cursor.
Cursors are interchangeable: for
example, the left cursor may be
moved to the right of the right
cursor and
first will give the
location of the cursor formerly
on the right, now on left.
freq Frequency: Period of cyclic signal
measured as time between every other
pair of 50 % crossings. Starting with first
transition after left cursor, the period is
measured for each transition pair. Values
then averaged and reciprocal used to give
frequency. 1/ period
(See Fig. C
–2)
last Time from trigger to last (rightmost)
cursor. Time from trigger
to last cursor
(See Fig. C
–2)
Indicates location of right cursor.
Cursors are interchangeable: for
example, the right cursor may be
moved to the left of the left cursor
and
first will give the location of
the cursor formerly on the left,
now on right.
maximum Measures highest point in waveform.
Unlike
top , does
NOT
assume waveform
has two levels.
Highest value in
waveform
between cursors
(See Fig. C
–1)
Gives similar result when
applied
to time domain
waveform or histogram of data
of same waveform. But with
histograms, result may include
contributions from more than
one
acquisition. Computes
horizontal axis location of
rightmost non-zero bin of
histogram
— not to be
confused with maxp .
mean Average of data for time domain
waveform. Computed as centroid of
distribution for a histogram. But when
input is periodic time domain waveform,
computed on an integral number of
periods.
Average of data
(See Fig. C
–2)
Gives similar result when
applied
to time domain
waveform or histogram of data
of same waveform. But with
histograms, result may include
contributions from more than
one acquisition.