low logic on 9476 seems high

I'm providing 12 V for my 9476 (and checked by measuring on the pins). When I switch one of my channels I see 12 V when I'm high logic, but when I put it down I see about 7.75 V. I wouldn't be surprised, I guess, see some amount of tension when it is low, but it's nearly 2/3 or the supplied voltage. I have a few controllers level some of these channels are connected to and 8V is preventing the offset voltage to be anything but high logic.

So my questions:

  • When I pulled out a scratch on one of the lines of my 9476 is supposed to actually a low output or is it rather floating line (and therefore requires a resistance of drop-out)?
  • If it is assumed a real output voltage, why the hell is he so high compared to the Vsup?

Thank you!

Hi Ryan,

It seems that it is actually expected behavior, as explained in this KB: http://digital.ni.com/public.nsf/allkb/6D6DDEA68D41E94E86257168005B948D

So to do little be zero you would need to pull-down resistance, as you said. The process to do this is explained here: http://digital.ni.com/public.nsf/allkb/C9019BC9F6544005862572BF0059B532

I hope this helps!

Tags: NI Hardware

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