LeCroy DDA 7 Zi series, Operator'S Manual

Page: 191 / 544

Operator's Manual
WP700Zi-OM-E-RevA
190
Parameter Description Definition Notes
low frequency waveform (LF)*100 discriminate levels from noise in
data.
Available in DDM2.
Standard in DDA-5005A.
Ring Ringback (high or low) Available with SDA parameter.
Rj Effective
Amount of random jitter
(estimated) in a signal
Available with SDA parameter.
Rise
Rise time: Duration of rising
edge from 10-90% of the
signal amplitude.
Time at lower threshold
minus
Time at upper threshold
averaged over each
rising edge
On signals not having two major
levels (triangle or saw-tooth waves,
for example), top and base can
default to maximum and minimum,
giving, however, less predictable
results.
Standard parameter.
Rise 20-80%
(rise2080)
Rise 20% to 80%: Duration
of pulse waveform's rising
transition from 20% to 80%
of the signal amplitude,
averaged for all rising
transitions between the
cursors.
Average duration of rising
20-80% transition
On signals not having two major
levels (triangle or saw-tooth waves,
for example), top and base can
default to maximum and minimum,
giving, however, less predictable
results.
Standard parameter.
Rise@level
(rise@lv)
Rise at level: Duration of
pulse waveform's rising
edges between user-defined
transition levels.
Threshold arguments specify
two vertical values on each
edge used to compute rise
time.
Formulas for upper and lower
values:
lower = lower thresh. x
amp/100 + base
upper = upper thresh. x
amp/100 + base
Slew rate for % or
absolute levels of rising or
falling edges.
Enhanced version sets
measurement calculations
to use one of the
following:
Base & Top (% or
absolute)
Peak-Peak (%)
0V-Max (%)
On signals not having two major
levels (triangle or saw-tooth waves,
for example), top and base can
default to maximum and minimum,
giving, however, less predictable
results.
Standard parameter.
Enhanced parameter available with
EMC option.
RMS
Root Mean Square of data
between the measure gate.
Where: v
i
denotes
measured sample values,
and N = number of data
points within the periods
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.
Standard parameter.