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Figure 71. Single Two-Signal Edge-Separation Measurement
Counter Value
Latched Value
Implicit Buffered Two-Signal Edge-Separation Measurement
Implicit buffered and single two-signal edge-separation measurements are similar, but implicit
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 the FIFO. On the next active edge of the Gate signal, the counter
begins another measurement. The sampled values will be transferred to host memory using a
high-speed data stream.
The following figure shows an example of an implicit buffered two-signal edge-separation
measurement.
Figure 72. Implicit Buffered Two-Signal Edge-Separation Measurement
Counter Value
Sample Clocked Buffered Two-Signal Separation Measurement
A sample clocked buffered two-signal separation measurement is similar to single two-signal
separation measurement, but buffered two-signal separation measurement takes measurements
over multiple intervals correlated to a sample clock. 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 the FIFO on a sample
clock edge. On the next active edge of the Gate signal, the counter begins another
measurement. The sampled values will be transferred to host memory using a high-speed data
stream.
96 | ni.com | cRIO-904x User Manual
Counter
Armed
AUX
GATE
SOURCE
0
0
0
AUX
GATE
SOURCE
1
Buffer
Measured Interval
0
1
2
3
4
5
2
3
1
2
3
3
3
3
6
7
8
8
8
8
1
2
3
3
3
3
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