DS-TACHO-2
TECHNICAL REFERENCE MANUAL
5. Operating instructions
The remote optical sensor is capable of detecting a reflected pulse from a target consisting of reflective
tape at distances of up to 1 meter from the rotating object and angles up to 45 degrees.
For most applications, a 12-mm square piece of reflective tape should be applied to a clean area on the
rotating object. The sensor should be optically aligned to illuminate the on-target indicator once per
revolution. The sensor must be mounted steady to obtain accurate measurement. The optical sensor
must be placed at a slight angle (15 degrees recommended) from perpendicular, so that the sensor will
receive only pulses from the reflective marker.
The optical sensor must be at least 25 mm from the reflective target to avoid false triggering. The green
LED on-target indicator will blink at the input frequency rate when the sensor is properly aimed.
NOTE : The green LED On-Target Indicator will blink on and off at slow speeds and
remain on steady at high speeds.
DS-TACHO-2 V20-1 6/15
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