Fiber Optic V & A Meters

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

I like to measure KV and mA supplied by my filtered DC supply while it is
powering my twin TC.  The supply is plus & minus 10KV, center grounded (4
MOTs, twin doublers).  I now use analog meters directly wired into the HV
and have the meters located away from the coil so I can read them without
getting streamer zaps.

I don't like the meters floating at high voltage - not safe.  I would like
them isolated by optical fiber cables.  If I use a simple LED and
phototransistor combination, or LED and photodiode and op amp, what
linearity can I expect?  I need to measure 0 to 20 KV and 0 to 200 mA.

If any of you have built fiber isolated V & A meters, please share details
and results.

Thanks,
--Steve Young