Brushless DC motor Tacho measurement cDAQ-9174

Hi Folks,

I’m trying to monitor the speed of brushless DC motor (Thomas 1410 series 12v). using a cDAQ -9174 chassis.

The motor runs as expected but when I attach an oscilloscope to the Tacho output I’m only seeing signals between 0.3v and 0 (but at the correct frequency).  

Is this enough of a signal to bring directly into the chassis (what module would people recommend)?

If not, what should I do to the signal to achieve the 0-5v TTL described in the spec sheet?

(again, what module would be best suited?)

Please excuse my inexperience as I’ve never played with frequency measurement before.

Regards

Spec sheet and Brochure attached