National Instruments cDAQ-9133 User Manual

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Chapter 5 Counters
Figure 5-5 shows an example of a single pulse-width measurement.
Figure 5-5. Single Pulse-Width Measurement
Implicit Buffered Pulse-Width Measurement
An implicit 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 the counter FIFO. The
STC3 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 Measurement
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. The STC3 transfers the sampled values to host memory using a high-speed data
stream.
SOURCE
GATE
Counter Value
Latched Value
10
2
2
SOURCE
GATE
Counter Value
Buffer
10 3
3
2
212
3
3
2

National Instruments cDAQ-9133 Specifications

General

Brand	National Instruments
Model	cDAQ-9133
Category	Controller
Language	English