Hardware-Timed Single Point Position Measurement; Two-Signal Edge-Separation Measurement - National Instruments DAQ X Series User Manual

Chapter 7 Counters
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.
Sample Clock
(Sample on Rising Edge)

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)
hardware-timed single point (HWTSP) operations.
For information about connecting counter signals, refer to the
Counter/Timer Pinouts

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 input.
X Series User Manual
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Counter
Armed
Ch A
Ch B
Count 0 1
Buffer
1
Figure 7-23. Buffered Position Measurement
X Series USB devices do not support
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1
3
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