[chbot] Earth issues

[Mark Atherton]

Can't help but think that all of the above (below) should be earthed.

On 23/11/2016 8:25 AM, Marshland Engineering wrote:
> Wow what a reply I got !!
>
> For this discussion can we ignore the safety aspect. Besides, if you want
> shocks, come and play with my eclectic fence. 10 times more shock than humble
> mains.
>
> The discussion is about saving components on PC boards while under test.
>
> My Tenma rework station does not have the soldering iron tip earth to mains
> ground. I was expecting this.
> MY Tenma power supply also does not have the negative connected to earth.
> I am working with a laptop so the USB ground would be floating.
> My Rigol DS105E which when not earthed has a 90 volt AC on the probe earth
> with respect to mains ground. I did not expect this.
>
> If the scope was not exhibiting the 90 v, my guess would have been a high
> value resistor between equipment ground and mains ground to drain away any
> buildup of static.
>
> Any suggestions on the Rigol's 90 v issue ?
>
> Thanks Wallace.
>
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