[volt-nuts] 34401A Why 10M ohm default i/p resistance?

Tony vnuts at toneh.demon.co.uk
Thu Apr 10 16:54:15 EDT 2014

Very unlikely I'd have thought - the relay (K104) which selects between 
the high and low voltage ranges also selects the  I/P resistance. It 
wouldn't get used any more than the identical relay |(K102) which 
switches when changing between 10 and 100V ranges.

In any case a typical signal relay is rated for 10^8 operations 
(typical) with no load, as in this application, which is 32 years at one 
operation per second! How often does even a heavily used DVM change 
between the 10 and 100V ranges?

On 10/04/2014 20:27, Andreas Jahn wrote:
> Hello,
> perhaps its just to save the lifetime of the input range selection 
> relays to at least the warranty time.
> Just a guess.
> With best regards
> Andreas

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