Measurement Computing DaqBoard 3000USB Series - Manual (Page 81)

A typical acquisition might take 6 readings off of the 3000USB Series board module as illustrated below.
The user determines the scan rate and the number of scans to take.
DaqBoard/3000USB Series board Acquisition of Six Readings per Scan
Note: Digital channels do not take up analog channel scan time.
In general, the output of each channel’s counter is latched at the beginning of each scan period (called the
start-of-scan.) Every time the 3000USB Series board receives a start-of-scan signal, the counter values are
latched and are available to the /3000USB Series board.
The 3000USB Series board clears all counter channels at the beginning of the acquisition. This means that
the values returned during scan period 1 will always be zero. The values returned during scan period 2
reflect what happened during scan period 1.
The scan period defines the timing resolution for the /3000USB Series board.
If you need a higher timing resolution, shorten the scan period.
DaqBoard/3000USB Series User’s Manual 887794 Counter Input Modes 5-19