Chapter 9

Counters

Even if the Source pulses are long, the counter increments only once for each Source pulse.

Normally, the counter value and Counter n Internal Output signals change synchronously to the Source signal. With duplicate count prevention, the counter value and Counter n Internal Output signals change synchronously to the 80 MHz Timebase.

Enabling Duplicate Count Prevention in NI-DAQmx

Duplicate count prevention is automatically used with the USB-621xdevices. Disabling duplicate count prevention is not supported.