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acquire digital with 6009

Hi , I have a big problem I want to measere the speed of the rotor by a simple tacometer of the bycicle. My problem is the tacometer put a 5v when you give a  cicle then the signal is  0, but in the computer I only can see a 1v signal, but all the time. I measure this with the 5v source of the 6009. Do you know a solution about it?
thanks for your time
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Hola,

 

Si vas a la pagina 23 de las especificaciones veras que se detecta nivel alto a partir de 2 Voltios.

http://www.ni.com/pdf/manuals/371303h.pdf

Tendrías que conectar un amplificador, optoacoplador, etc... para convertir esa señal a TTL de 0 a 5 voltios.

 

Saludos,

 

Regards,

Jaime Cabrera

NI Applications Engineering Spain
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