calibrate a speed sensor

[Ricardo48111]

I have a small engine hooked up to a water break dyno. The speed sensor is a magnetic pick up device off of a 60 tooth gear. The sensor is plugged into a NI 9401 module. The display shows a set of zeros and ones. How could i get it to show revolutions per minute?  Also there is a load cell that is plugged into a NI 9201 module. The readings are very erratic. I show between -0.1 V and 0.1 V without the motor running and without any water flowing into the dyno. Thank you

[Abhinav T]

Ricardo,

Thank you for posting to the National Instruments Discussion Forums.

You will need to use the counter functionality of the compactDAQ chassis. If you place your 9401 module in slot 5 or 6 of your chassis. From here you can perform counting operations to count the number of edges that your sensor produces. From here you can calculate the number of revolutions. Here is a tutorial on counter input using the DAQ Assistant (similar to the interface in Signal Express)

Hope this helps!