19 Reference
422 InfiniiVision 7000B Series Oscilloscopes User’s Guide
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 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 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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