326 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
20 Save/Email/Recall (Setups, Screens, Data)
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.
See Also • “Binary Data (.bin) Format" on page 381
• “CSV and ASCII XY files" on page 388
• “Minimum and Maximum Values in CSV Files" on page 389
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 the smaller measurement
record.
• Whether the oscilloscope was stopped using [Stop] or [Single]. Running
acquisitions split memory to provide fast waveform update rates. Single
acquisitions use full memory.
• Whether only one channel of a pair is turned on. (Channels 1 and 2 are one pair,
channels 3 and 4 are the other.) Acquisition memory is divided among the
channels in a pair.
• Whether reference waveforms are on. Displayed reference waveforms consume
acquisition memory.
• Whether digital channels are on. Displayed digital channels consume
acquisition memory.
• Whether segmented memory is on. Acquisition memory is divided by the
number of segments.
• The horizontal time/div (sweep speed) setting. At faster settings, fewer data
points appear on the display.
• When saving to a CSV format file, the maximum number of data points is 64K.
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