"Peter L. Peres" wrote:
>
> >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.
>
> imho anything powered by more than about 200W that does not have
> differential or optically insulated (or transformer insulated) measuring
> outputs is not really an 'instrument' and cannot really be made to be one
> until the mentioned solution is added. (Hint: Assume a grounding
> resistance of 0.1 ohms and a random ground current of <= 10% of the supply
> current - pick your operating voltage at will under 300V DC or AC).
>
> Peter

I rang Instron and mentioned that other similar model controllers that
we use, have insulated BNC connectors for thier signal outputs, but this
particulr model has BNC connectors with the shield connected to the
chassis. I thought that perhaps they installed the wrong connectors, but
they said no.

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@picnpoke.com

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