On 28/10/2010 11:24, Matt Rhys-Roberts wrote:
> We need to switch a single attenuated ADC between a number of high
> voltage (+/-1Kv) sources. Some kind of solid state relay or multiplexer
> appears to be necessary. The switching element would only need to pass
> well below 1mA.
>
> Can anyone here suggest such a semiconductor device that would withstand
> +/-1kv, at load currents well below 1mA? Ideally PCB mounted, as small
> as possible, and controllable by TTL logic levels.
>
> I've been avoiding using reed relays so far, for fear of them wearing
> out prematurely (looks like they may last for around 10 million or so
> cycles). However if nothing solid state can beat them, then I may employ
> them and assert that they only be operated sparingly!
>
> Don't flame me if I've overlooked the obvious...
>
> Best regards,
> Matt
R1 R2 Potential Divider at all the sources and switch the low voltage?


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