QD1 Incremental Shaft Encoder Interface


The QD1, a general-purpose quadrature decoder, is required for some shaft encoders you may use in water-level or slope-stability applications. Please note that our CS410 Shaft Encoder does not require the QD1.

Note: A new quadrature instruction is available in the CR1000, CR800, CR850, and CR1000X dataloggers. For questions, contact Campbell Scientific. 



Datalogger Considerations

Two datalogger pulse count channels are required. A connection to a 5 V output and ground is also required.


Connected sensors are measured by the PulseCount Instruction in CRBasic and by Instruction 3 (Pulse Count) in Edlog. The "up" versus "down" pulses are tallied in the datalogger.

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR6 CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

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