Save/Email/Recall (Setups, Screens, Data) 21
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 265
CSV Data
When the CSV data (*.csv) file format is selected, comma-separated values for
each displayed waveform and digital channel pod are saved as multiple columns
in a single file. Math FFT waveforms, whose values are in the frequency domain,
are appended at the bottom of the .csv file. Pod names (for example, D0-D7) or
waveform labels are used as column headers. This format is suitable for
spreadsheet analysis.
For CSV data, length "N" value-at-time measurements are performed across the
entire screen (using the analysis record data) for each active source. Interpolation
between analysis record data points is performed as needed.
ASCII XY Data
When the ASCII XY data (*.csv) file format is selected, comma-separated value
files for each displayed waveform, digital channel pod, digital bus, and serial bus
are saved. For digital pods, an underscore (_) and the pod name (for example,
D0-D7) are appended to the specified file name; otherwise, an underscore and the
waveform's label are appended.
If the oscilloscope acquisition is stopped, data from the raw acquisition record
(which has more points than the analysis record) can be written. Press the [Single]
key to obtain maximum memory depth with current settings. If enabled, serial
decode data is saved.
When you want to save less than the maximum number of data points, a 1-of-N
decimation is performed to produce an output whose length is less than or equal
to the requested length. For example, if there are 100k points of data, and you
specify a length of 2k, 1 of every 50 data points is saved.
Length Control
The Length control is available when saving data to CSV, ASCII XY, or BIN format
files. It limits the maximum number of data points that can be saved.
When Max Length is enabled, the maximum number of waveform data points is
saved.
The actual number of data points saved depends on displayed data and on these
factors:
• Whether acquisitions are running. When stopped, data comes from the raw
acquisition record. When running, data comes from a smaller running
acquisition record.
• Whether the oscilloscope was stopped using [Stop] or [Single]. Running
acquisitions use less memory to provide fast waveform update rates. Single
acquisitions use full memory.
• The horizontal time/div (sweep speed) setting when stopped using [Stop]. At
faster settings, fewer data points appear on the display.
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