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Chapter 7
Counters
Buffered Two-Signal Edge-Separation Measurement
Buffered and single two-signal edge-separation measurements are similar,
but buffered measurement measures multiple intervals.
The counter counts the number of rising (or falling) edges on the Source
input occurring between an active edge of the Gate signal and an active
edge of the Aux signal. The counter then stores the count in a hardware save
register. On the next active edge of the Gate signal, the counter begins
another measurement. A DMA controller transfers the stored values to host
memory.
Figure 7-21 shows an example of a buffered two-signal edge-separation
measurement.
For information on connecting counter signals, refer to the
Terminals
NI 6238/6239 User Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Counter
Armed
AUX
GATE
SOURCE
Counter Value
0
0
0
HW Save Register
Figure 7-20. Single Two-Signal Edge-Separation Measurement
AUX
GATE
SOURCE
Counter Value
1
Buffer
Figure 7-21. Buffered Two-Signal Edge-Separation Measurement
section.
7-20
Measured Interval
0
1
2
3
4
5
6
7
2
3
1
2
3
1
3
3
3
Default Counter
8
8
8
8
2
3
3
3
3
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