[tinwhiskers] Re: Expert recreates Toyota sudden acceleration
- From: Rod <rod.dalitz@xxxxxxxxxxxxxxxx>
- To: tinwhiskers@xxxxxxxxxxxxx
- Date: Thu, 25 Feb 2010 21:29:02 +0000
On 25 Feb 2010, at 20:56, ab3a@xxxxxxxxxxx wrote:
> In control systems we use 4-20 mA current loops to convey analog information.
> The reason we do not let it go to zero is because if we did, an open circuit
> would not be detectable.
That is no doubt a good reason, but another is that in the early analog days a
potentiometer could not go smoothly to infinite resistance!
Even with electronic sources, the 4mA is available to power the instrument.
regards, Rod
rod.dalitz@xxxxxxxxxxxxxxxx
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