scb-68 and PCI-8331 what is converting my analog sgnal into digital%3F

[sukhiray]

Long ago, around 7 years ago, I worked on a project in which I interface photodetector to my computer through SCB-68 kit. The SCB-68 kit was connected to computer using PCI-8331 card.

Now, my input was analog signal from photodetector but at programming interface I was getting digital values for computation. Now my confusion about the conversion task done by which part of this connection?

SCB-68 was converting the input signal and supplying digital output? or PCI-8331 was doing digitization before delivering information to computer? or labview itself was doing it after getting signal from PCI-8331?

can anyone please clear me?

Thanks!

[Dennis_Knutson]

The scb-68 is just a dumb terminal block. The pci-8331 is http://sine.ni.com/nips/cds/view/p/lang/en/nid/13179 and does not connect to photodetectors so your memory is flawed about the part number. An actual DAQ card would have done the conversion.

[sukhiray]

Thanks for your response.

Yes.. you are right..  PCI 8331 is not capable of receiving signal from photodetector. I must have used chesis inbetween.. SO you mean there was a DAQ card whch was communicating between SCB and PCI and was doing the digitization?

Thanks!

[Dennis_Knutson · Accepted solution]

Of course there was a DAQ card someplace.