[time-nuts] Isolated +20V for lamp supply

[paul swed]

I will guess to minimize radiated noise.
Regards
Paul

On Fri, Aug 14, 2020 at 4:34 AM <timeok at timeok.it> wrote:

>
>    Corby,
>
>    so why did HP use a coaxial cable for the lamp power? it seems nonsense.
>
>    Luciano
>
>    Luciano P. S. Paramithiotti
>    timeok at timeok.it
>    www.timeok.it
>
>    Da "time-nuts" time-nuts-bounces at lists.febo.com
>    A time-nuts at lists.febo.com
>    Cc
>    Data Thu, 13 Aug 2020 10:46:01 -0700
>    Oggetto [time-nuts] Isolated +20V for lamp supply
>    Luciano,
>
>    You should "Ohm out" the lamp connector shield to the chassis with
>    nothing connected to the connector.
>    Depending on how your optical unit is mounted there is a good chance the
>    lamp assy is grounded to the chassis through the threaded stud!
>    Especially so if the optical is the newer unpainted one.
>    If so isolating it as you detailed does not change anything!
>
>    Cheers,
>    Corby
>
>
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