Quadrature Measurements - Campbell CR300 Series Product Manual

CRBasic instruction: PulseCount().
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See alsoPower output specifications

14.5.4 Quadrature measurements

Quadrature()
The
outputs a signal to represent the angular position or motion of the shaft. Each encoder will have
two output signals, an A line and a B line. As the shaft rotates the A and B lines will generate
digital pulses that can be read, or counted, by the data logger.
In the following example, channel A leads channel B, therefore the encoder is determined to be
moving in a clockwise direction. If channel B led channel A, it would be determined that the
encoder was moving in a counterclockwise direction.
Terminals SE1 and SE2 or C1 and C2 can be configured as digital pairs to monitor the two
channels of an encoder. The
The accumulated number of counts from channel A and channel B. Count will increase if
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channel A leads channel B. Count will decrease if channel B leads channel A.
The net direction.
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Number of counts in the A-leading-B direction.
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Number of counts in the B-leading-A direction.
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Counting modes:
Counting the increase on rising edge of channel A when channel A leads channel B.
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Counting the decrease on falling edge of channel A when channel B leads channel A.
Counting the increase at each rising and falling edge of channel A when channel A leads
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channel B. Counting the decrease at each rising and falling edge of channel A when
channel A leads channel B.
(p. 186).
instruction is used to measure shaft or rotary encoders. A shaft encoder
Quadrature()
instruction can return:
14. Measurements 82