Hi,
Few months ago I was asking about using an ECD in a balloon experiment (link). So now we are few steps further trying to use uECD from Agilent.
We got two PCBs delivered with uECD (Signal Board and Interface Board). Normally the Interface Board should be connected to GC but we can't take GC to the balloon, so we have to connect it somehow to our system. It's not so complicated as I expected, however on the Signal Board there is a circuit which I can't understand.
http://i.imgur.com/ZwVEBeT.png?1
If someone knows what signal should be put on input to get proper output, please help :)

Andrzej