National Instruments NI CompactDAQ 9184 User Manual

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Chapter 5 Counters
Single Pulse-Width Measurement
With single pulse-width measurement, the counter counts the number of edges on the Source
input while the Gate input remains active. When the Gate input goes inactive, the counter stores
the count in the FIFO and ignores other edges on the Gate and Source inputs. Software then reads
the stored count.
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.
SOURCE
GATE
Counter Value
Latched Value
10
2
2
SOURCE
GATE
Counter Value
Buffer
10 3
3
2
212
3
3
2

National Instruments NI CompactDAQ 9184 Specifications

General

Brand	National Instruments
Model	NI CompactDAQ 9184
Category	Chassis
Language	English