5-6 | ni.comChapter 5 CountersFigure 5-5 shows an example of a single pulse-width measurement.Figure 5-5. Single Pulse-Width MeasurementImplicit Buffered Pulse-Width MeasurementAn implicit buffered pulse-width measurement is similar to single pulse-width measurement, butbuffered pulse-width measurement takes measurements over multiple pulses.The counter counts the number of edges on the Source input while the Gate input remains active.On each trailing edge of the Gate signal, the counter stores the count in the counter FIFO. TheSTC3 transfers the sampled values to host memory using a high-speed data stream.Figure 5-6 shows an example of an implicit buffered pulse-width measurement.Figure 5-6. Implicit Buffered Pulse-Width MeasurementSample Clocked Buffered Pulse-Width MeasurementA sample clocked buffered pulse-width measurement is similar to single pulse-widthmeasurement, but buffered pulse-width measurement takes measurements over multiple pulsescorrelated to a sample clock.The counter counts the number of edges on the Source input while the Gate input remains active.On each sample clock edge, the counter stores the count in the FIFO of the last pulse width tocomplete. The STC3 transfers the sampled values to host memory using a high-speed datastream.SOURCEGATECounter ValueLatched Value1022SOURCEGATECounter ValueBuffer10 33 22123 32
