How to measure position with linear encoders, using DAQ USB-6281?

[Allef]

I hould like to measure position from a LS303 encoder, combined with a Analogic/Digital converter and interpolation model EXE610C , from HEIDENHAIN.

My DAQ is the USB-6281. I am using DAQ Assistant to measure the signals, in the counter conectors, group ctr0 and ctr1.

The output frequency from the encoder goes up 50kHz.  

Question 1.  What configuration should I use from rate and number of points for geting all steps from the encoder? I imagine that 4x50kHz, or 200kHz, hould be enought.

Question 2. Does the signal TTL from encoder serves to use as clock to the counters?

Question 3. If i get repeted measurement steps, how can i solve it, by software processing?

Some one can help me?

Tanks

[bnoronha]

Allef -

200 kHz should be enough, normally a rate that is double the value of frequency will work just fine.

Yes I believe a TTL signal can be used to time counters

If you are getting repeated measurment steps try switching the acquisition mode from continuous to N samples.