Chapter 7 Counters
X Series User Manual 7-26 ni.com
counter armed event; that is, the sample clock does not reset the counter.
You can route the counter sample clock to the Gate input of the counter.
You can configure the counter to sample on the rising or falling edge of the
sample clock.
Figure 7-23 shows an example of a buffered X1 position measurement.
Figure 7-23. Buffered Position Measurement
Hardware-Timed Single Point Position Measurement
A hardware-timed single point (HWTSP) position measurement has the
same behavior as a buffered (sample clock) position measurement.
Note (NI USB-634x/635x/636x Devices) X Series USB devices do not support
hardware-timed single point (HWTSP) operations.
For information about connecting counter signals, refer to the Default
Counter/Timer Pinouts section.
Two-Signal Edge-Separation Measurement
Two-signal edge-separation measurement is similar to pulse-width
measurement, except that there are two measurement signals—Aux and
Gate. An active edge on the Aux input starts the counting and an active
edge on the Gate input stops the counting. You must arm a counter to begin
a two edge separation measurement.
After the counter has been armed and an active edge occurs on the Aux
input, the counter counts the number of rising (or falling) edges on the
Source. The counter ignores additional edges on the Aux inpu t.
1
3
1
Ch A
Ch B
3102
4
Count
Buffer
Sample Clock
(Sample on Rising Edge)
Counter
Armed
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