LeCroy DDA 7 Zi series, Operator'S Manual

Page: 331 / 544

Operator's Manual
WP700Zi-OM-E-RevA
330
x
The measurement range of the histogram
x
The number of bins to be used
Once these are defined, the oscilloscope is ready to make the histogram.
The sequence for acquiring histogram data is:
1. trigger
2. waveform acquisition
3. parameter calculations
4. histogram update
5. trigger re-arm.
If the timebase is set in non-segmented mode, a single acquisition occurs prior to parameter calculations.
However, in Sequence mode an acquisition for each segment occurs prior to parameter calculations. If the source
of histogram data is a memory, storing new data to memory effectively acts as a trigger and acquisition. Because
updating the screen can take significant processing time, it occurs only once a second, minimizing trigger dead-
time (under remote control the display can be turned off to maximize measurement speed).
Histogram Parameters
Once a histogram is defined and generated, measurements can be performed on the histogram itself. Typical of
these are the histogram’s:
x
Average value, standard deviation
x
Most common value (parameter value of highest count bin)
x
Leftmost bin position (representing the lowest measured waveform parameter value)
x
Rightmost bin (representing the highest measured waveform parameter value).
Histogram parameters are provided to enable these measurements. Accessible by selecting Statistics from the
Select Measurement menu, they are calculated for the selected waveform section between the parameter
cursors.