Magnetic Encoder / ABS Sensor

[doneill]

I want to take measurements from an ABS sensor, which I will use as a shaft encoder. 

As my device is a two wire device, I'm assuming that it is a 'variable reluctance' type.

I'm looking for advice as to which NI card I should use to make these measurements. Bench tests seem to indicate that the voltage generated by the sensor is in the millivolt range, which makes me wonder if I should use a thermocouple unit!

Has anyone taken measurements from an ABS sensor using NI hardware before?

Dan

[Henrik_Volkers]

If it is a varialble reluctance type sensor you migth get increasing voltages with increasing speed. Did you do your bench test with similar speeds? Did you use a scope or a multimeter?

Thermocouple inputs often have low pass filters ... not usefull in your case.

What is the expected frequency range?  

For a quick and dirty test you can try the soundcard ( ! AT OWN RISK ! )

Soundcard input protection

The attached vi is untested !

 

For industrial use a real DAQ , depending on other values you want to measure.

[hicksc]

Hi Doneill

There's a good article on this type of application: Using a Magnetic Encoder in an Anti-Lock Braking Application 

Kind Regards