Sample Clocked Buffered Pulse-Width Measurement; Hardware-Timed Single Point Pulse-Width Measurement - National Instruments DAQ X Series User Manual

Chapter 7 Counters

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.
Gate
Source
2
Sample Clock
Buffer
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 occur.
Note (NI USB-634x/635x/636x Devices)
hardware-timed single point (HWTSP) operations.
For information about connecting counter signals, refer to the
Counter/Timer Pinouts
X Series User Manual
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Figure 7-7. Sample Clocked Buffered Pulse-Width Measurement
X Series USB devices do not support
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