Tech Note 246 Detail

Clicks, but reads a small constant value when used with SW500.

Affected Products:

CI-6742 Motion Sensor II

Problem/Symptom:
The Motion Sensor II clicks, but reads a small constant value (< 1 m) when used with the ScienceWorkshop 500 interface.

PASCO Solution:
The inductor inside the Motion Sensor was tuned incorrectly, requiring an excessive amount of current from the interface. This lowers the voltage to a circuit that supresses the signal detection, resulting in the sensor detecting its own emitted ultrasonic chirp rather than the reflected chirp. Please contact Technical Support to return the unit for repair.

Creation Date: 10/8/2001
Last Modified: 10/2/2003
Mod Summary: