external sample clock encoder

[orsogna]

hello,

my problem is very urgent, I have to sample 3 analog input synchronised to an encoder. How can use the channel from the encoder and use them to generate a external sample clock for acuiring the analog signals?how can I phisically attache the wire from the encoder to the digital line?and how the vi should be??my encoder has A, Anot,B,Bnot channel, but eventually with a circuit I can get just A and B. I have a PCI6221.

Please is very urgent!!

[orsogna]

and is it possible to duplicate the frequency of the sample clock by using both the A and B channel of the encoder(TTL signals shifted of 90°)??

[sisu84]

Hi orsogna,

see the example Cont Acq&Graph Volt-Ext clock in the Labview Example Finder.

About wirings, you have to connect our encoder signal (A signal is good) to a PFI input in order to correctly read the TTL signal.

Ciao!

[orsogna]

tank u for answering...I did it. The problem now is how to use the A and B channel to have an x4 encoding. Is it possible to have an external clock with the frequency doubled?

thank u again

[orsogna]

and is it possible to use a change detection to sample at both the edges of one channel(a or B) and how?