316 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
24 Reference
For example: If the Length control is set to 1000 points, there will be 1000 points
(rows in the spreadsheet) per segment. When saving all segments there are three
header rows, so the data for the first segment starts at row 4. The second
segment's data starts at row 1004. The time column shows the time since the
trigger on the first segment. The top row shows the selected number of points per
segment.
BIN files are a more efficient data transfer format than CSV or ASCII XY. Use this
file format for fastest data transfer.
Minimum and Maximum Values in CSV Files
If you are running a Minimum or Maximum measurement, the minimum and
maximum values shown in the measurement display may not appear in the CSV
file.
Explanation: When the oscilloscope's sample rate is 4 GSa/s, a sample will be taken every
250 ps. If the horizontal scale is set to 10 us/div, there will be 100 us of data
displayed (because there are ten divisions across the screen). To find the total
number of samples the oscilloscope will take:
100 us x 4 GSa/s = 400K samples
The oscilloscope is required to display those 400K samples using 640 pixel
columns. The oscilloscope will decimate the 400K samples to 640 pixel columns,
and this decimation keeps track of the min and max values of all the points that
are represented by any given column. Those min and max values will be displayed
in that screen column.
A similar process is used to reduce the acquired data to produce a record usable
for various analysis needs such as measurements and CSV data. This analysis
record is much larger than 640 and can contain 65536 or more points. Still, once
the # of acquired points is greater than the analysis record length, some form of
decimation is required. The decimator used to produce a CSV record is configured
to provide a best-estimate of all the samples that each point in the record
represents. Therefore, the min and max values may not appear in the CSV file.
Frequency Data in CSV Files
When data for multiple frequency sources is saved to a CSV file, this data is saved
as one set (with multiple columns) using a horizontal (X) range that covers all
sources.
Acknowledgements
Third-party software acknowledgements and licenses for these InfiniiVision
HD3-Series oscilloscopes are located at
www.keysight.com/find/InfiniiVision-third-party-software.
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