Can I measure frequency with a USB 6501 card?

[usaplanb]

My lab purchased a USB 6501 card for acquiring data from a fuel flow meter.  The transmitter ouputs a TTL signal and comes with calibration data for pulses/cc.  Is there an easy way to use the counter on the 6501 card to measure the frequency of these pulses?  

I'm starting to think we should have purchased a device with hardware timing.  What card (preferably USB) would be best suited to this application?

Thanks! 

[KateB]

Hi usapanb,

If you wish to have hardware frequency measurement capability, you need at least USB-6210, http://sine.ni.com/nips/cds/view/p/lang/en/nid/203189.

However, 6501 can also achieve this with software by doing edge counting, and divide edge difference between loop with time between loop.

Regards, Kate