USB 6001 speed measure

[Surfmase]

Hello Everyone,

This is my first experience with the USB 6001 and DAQExpress.  After reading some other posts, I realize this device is not well suited for incremental encoder reading.  Nonetheless, I believe my application is simple enough that it just might work.

I want to measure wire feed speed using an encoder which is attached to a roller of a known diameter.  I don't need direction or position, just speed.  I do not have any other inputs/outputs.

Could someone please suggest an approach?

Thanks a lot!

[caillotantoine]

Hi Surfmase, 

I suggest you to use the counter input as a frequency counter. Knowing the number of steps of your counter, and the diameter, you can calculate the speed of your roller. 

Best regards, 

Antoine

[Surfmase]

Hi caillotantoine,

Thanks for your suggestion.  I've tried using the counter input panel to measure frequency, but for some reason I cannot select my device.  If I choose "event counter" I can select my device and run the task successfully.  But with any other counter type I cannot select the counter on my device.  It only offers SimDev1/Ctr0 for example, and the task does not generate any measurements.

[Surfmase]

sorry for replying to myself, but I haven't made any progress.

Is the USB 6001 not capable of measuring frequency?

Following the guide, I tried to create a new virtual channel in the data neighborhood.  In the guide I should choose a physical channel from my hardware.  However, only the simulated devices show up as supported physical channels.  Sorry for my ignorance, but how can I get around this?  Or does my device not support frequency from 1 counter?

Thanks

[caillotantoine]

Hi Surfmase, 

Indeed, you cannot make any measurement on SimDev1/Ctr0  since it is a simulated device.

[Surfmase]

Thanks for confirming that. 

But why can't my usb 6001 device measure frequency with its counter?

Thanks

[caillotantoine]

I am currently installing DAQExpress to check that. I come back to you when it finished the install.