Chapter 7 Counters
© National Instruments 7-9 X Series User Manual
Pulse Measurement
In pulse measurements, the counter measures the high and low time of a
pulse on its Gate input signal after the counter is armed. A pulse is defined
in terms of its high and low time, high and low ticks or frequency and duty
cycle. This is similar to the pulse-width measurement, except that the
inactive pulse is measured as well.
You can route an internal or external periodic clock signal (with a known
period) to the Source input of the counter. The counter counts the
number of rising (or falling) edges occurring on the Source input
between two edges of the Gate signal.
You can calculate the high and low time of the Gate input by multiplying
the period of the Source signal by the number of edges returned by the
counter.
Refer to the following sections for more information about X Series pulse
measurement options:
• Single Pulse Measurement
• Implicit Buffered Pulse Measurement
• Sample Clocked Buffered Pulse Measurement
• Hardware-Timed Single Point Pulse Measurement
Single Pulse Measurement
Single (on-demand) pulse measurement is equivalent to two single
pulse-width measurements on the high (H) and low (L) ticks of a pulse, as
shown in Figure 7-8.
Figure 7-8. Single (On-Demand) Pulse Measurement
Counter
Armed
Gate
Source
HL
710
710
Latched
Value
987654321564321
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