Bjorn Gabrielsson wrote:

>Is it a problem to put a 10811 in a HP counter supposed to use the
>older 10544A?
>
>--
>    Björn
>  
>
The pinouts of the two units aren't quite identical, but are pretty
similar and it's possible to retrofit the 10811A as you suggest.  I
don't have the details at the top of my head, but if I recall correctly,
the only difference is in the way the power voltages route into the can;
what's combined on a single pin in one version goes to separate pins in
the other.

Check Tom Van Baak's pages at http://www.leapsecond.com/museum to find
schematics of both units.

John


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