DaqBook/3000USB User’s Manual
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Counter Input Modes 5-19
A typical acquisition might take six readings off of the DaqBook/3000USB as illustrated below. The user
determines the scan rate and the number of scans to take.
DaqBook/3000USB 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 DaqBook/3000USB receives a
start-of-scan
signal, the counter values are
latched and available to the unit.
The DaqBook/3000USB 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 DaqBook/3000USB.
If you need a higher timing resolution, shorten the scan period.
