National Instruments Eight-slot USB Chassis NI cDAQ-9172 - Manual (Page 45)

© National Instruments Corporation 45 NI cDAQ-9172 User Guide and Specifications
Figure 19 shows an example of a single pulse-width measurement.
Figure 19. Single Pulse-Width Measurement
Buffered Pulse-Width Measurement
Buffered pulse-width measurement is similar to single pulse-width
measurement, but buffered 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 a hardware save register. The NI cDAQ-9172 transfers
the stored values to host memory.
Figure 20 shows an example of a buffered pulse-width measurement.
Figure 20. Buffered Pulse-Width Measurement
SOURCE
GATE
Counter Value
HW Save Register
1 0
2
2
SOURCE
GATE
Counter Value
Buffer
1 0 3
3 2
2 1 2
3 3
2