National Instruments DAQ X Series User Manual

Chapter 7 Counters
X Series User Manual 7-6 ni.com
Pulse-Width Measurement
In pulse-width measurements, the counter measures the width of a pulse on
its Gate input signal. You can configure the counter to measure the width
of high pulses or low pulses on the Gate signal.
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 on the Source signal while the pulse on the Gate
signal is active.
You can calculate the pulse width by multiplying the period of the Source
signal by the number of edges returned by the counter.
A pulse-width measurement will be accurate even if the counter is armed
while a pulse train is in progress. If a counter is armed while the pulse is in
the active state, it will wait for the next transition to the active state to begin
the measurement.
Refer to the following sections for more information about X Series
pulse-width measurement options:
• Single Pulse-Width Measurement
• Implicit Buffered Pulse-Width Measurement
• Sam
ple Clocked Buffered Pulse-Width Measurement
• Hardware-Timed Single Point Pulse-Width
Measurement
Single Pulse-Width Measurement
With single pulse-width measurement, the counter counts the number of
edges on the Source input while the Gate input remains active. When the
Gate input goes inactive, the counter stores the count in the FIFO and
ignores other edges on the Gate and Source inputs. Software then reads the
stored count.
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National Instruments DAQ X Series Specifications

General

Brand	National Instruments
Model	DAQ X Series
Category	I/O Systems
Language	English