Chapter 7 Counters
X Series User Manual 7-8 ni.com
Sample Clocked Buffered Pulse-Width Measurement
A Sample Clocked Buffered pulse-width measurement is similar to single
pulse-width measurement, but buffered pulse-width measurement takes
measurements over multiple pulses correlated 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 to complete. A DMA controller
transfers the stored values to host memory.
Figure 7-7 shows an example of a sample clocked buffered pulse-width
measurement.
Figure 7-7. Sample Clocked Buffered Pulse-Width Measurement
Hardware-Timed Single Point Pulse-Width
Measurement
A hardware-timed single point (HWTSP) pulse-width measurement has the
same behavior as a sample clocked buffered pulse-width measurement.
Note If a pulse does not occur between sample clocks, an overrun error will occu r.
Note (NI USB-634x/635x/636x Devices) X Series USB devices do not support
hardware-timed single point (HWTSP) operations.
For information about connecting counter signals, refer to the Default
Counter/Timer Pinouts section.
Gate
Source
Sample Clock
2 342
4
3
22
4
Buffer
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