Measurement-computing DaqBoard 3000USB Series Manuel d'utilisateur télécharger pdf (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

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Measurement-computing DaqBoard 3000USB Series Manuel d'utilisateur Page 81