6602 external reference, what pin to connect to?

[BoeingJR]

I need better accuracy for my counter clock, I want to connect an external clock, what pin(s) on the PCI-6602 do I connect it to???

[silvius]

Hi,

You have to bring the external reference clock to the SOURCE of the CTR channel, then select the CTR source channel the default one.
The SOURCE pins for CTR0 to CTR7 are PFI 11, PFI 15, PFI 19, PFI 23, PFI 27, PFI 31, PFI 35, PFI 39.

Best regards.