"Peter L. Peres" wrote:
>
> Tony, I think that you are in the initial phases of introduction to real
> life industrial electronics ;-)
>

I reckon I could live to be a hundred and still never figure it out
totally.

Ground loops - sheesh. You ought to see the power cords draped around
the place.

I don't set up the experiments usually. I get called when they don't
work or when they work 'funny'.

I found the major problem. A PCB rail in a power supply was 'half'
shorted to a bolt holding the power transformer to the case. This was
the cause of the offsets that I couldn't explain.

The system appears to work ok now, except for some random spiking which
appears to be mains related. (Next problem)

The controller is made by Instron and they assured me that the output
signal needs to be referenced to the power ground to minimise ground
loops which could cause havoc with the ram controllers.




--
Best regards

Tony

mICro's
http://www.bubblesoftonline.com
mailto:sales@picnpoke.com

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