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