Reference 15
InfiniiVision Oscilloscopes User’s Guide 417
CSV and ASCII XY files
CSV and ASCII XY file structure
In CSV or ASCII XY format the Length control selects the number of points per segment.
All segments are contained in the CSV file or in each ASCII XY data file.
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 Quick Measurement Minimum or Maximum measurement, the
minimum and maximum values shown in the Quick 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 sweep speed is set to 100 ns/div, there will be 1000 ns of data displayed (because
there are ten divisions across the screen). To find the total number of samples the
oscilloscope will take:
For measurement data, the oscilloscope will decimate the 4000 points to 1000 points that
will fit on the display. This decimation will not lose track of the min and max values at
each of the 1000 horizontal data points, and min and max values will be displayed on
screen. However, the oversampled data is also processed to provide a best-estimate
value at each of the 1000 horizontal points. The data in the CSV file will be the
best-estimate value at each of the 1000 horizontal points. Therefore, the min and max
values may not appear in the CSV file.
This occurs when oversampling occurs
(10 * seconds per division * maximum sample rate > 1000).
1000ns 4Gsa s 4000samples=
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