There is another kind of static electric field meter that was commonly
used over the past few decades for monitoring charges/voltages in work
areas dealing with sensitive semiconductors. It has a small motor
spinning a hollow brass cylinder that has a radial hole or slot that
alternately shields and exposes a center cylinder inside, which is the
pickup electrode. This action causes a small AC signal on the electrode,
that can be amplified up to represent the electric field strength from
any nearby object. The signal is then rectified and trips a comparator
and LED indicator if the level exceeds a certain amount.
I have a couple of these units, but have never experimented with them
yet. They don't show any kind of readout or provide a measuring signal -
just the LED warning of excessive (unknown trip point) static charge
nearby. I figured someday I would modify one up and add a signal output
port and a sync output from the motor, allowing a lock-in analyzer to
read the result over a wide range, and maybe even be fairly accurate or
calibrate-able.
Ed
_______________________________________________
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
