B&K Precision 2552-2559 - Manual - Manual (Page 106)

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Note: The maximum number of data points of a waveform that can be
saved as a .CSV file into USB drive is ~24576 pts (depending on the
timebase setting) when data depth is set to maximum. The actual number
depends on the time base setting, the channels that are active, and whether
data depth is set to “display” or “maximum”. See below table for
maximum data points available in each timebase when data depth is set to
maximum.
Number of points saved to CSV file
(data depth set to maximum)
Time base *Half channel
interleaved
Per channel
50 s – 50 ns 12 k 12 k
25 ns – fastest time
base
24 k 12 k
*For 4CH models, CH1 and CH2 are interleaved, and CH3 and CH4 are
interleaved. “Half channel” operation means only CH1 or CH2 and/or CH3
or CH4 are active. For 2CH models, CH1 and CH2 are interleaved.
Note: 24 k refers to 24756 points, 12 k refers to 12288 points