Hi All
I was once going to make one of those thingys and stopped half way through when
I bought the Commander.
Modern Neon transformers have a circuit for protection like the outlets in
bathrooms.
It triggers if there is no ground. Green Third Wire needs to be connected to
transformer case. I have experienced that and of course the transformer could
be also bad too.
I used a TV B&K High voltage probe with a stick rectifier screwed on the end
to read the voltage. A little something from the days of 1B3 tubes that I used
to check if the flyback was worth the tube.
john W9ZY
--- On Sun, 1/9/11, Steve Flood <kk7uv@bresnan.net> wrote:
> Breakdown voltage tester. Built
> it like the plans on AG6K (R. Measures)
> webpage.
>
> I'm using a neon sign transformer. Hongba
> ME-1000-6000-30. 120:5000v.
> Running a voltage doubler as shown by Measures.
> >
> When running up the voltage slowly with the variac, the
> output voltage from
> the transformer drops out at about 600vac down to
> zero. If I run the variac
> back down to zero primary voltage and then slowly ramp up
> again, the output
> voltage climbs again to around 600vac and drops out again.
>
>
> The same behavior occurs hooked up to the rectifier/doubler
> circuit. Except
> I measure the dropout at a 1100-1200 vdc.
> So what's going on? It's as if there's a
> self-resetting breaker or limiter
> somewhere and all I can guess is in the transformer.
>
>
>
> The specs on the transformer indicate that it has "overload
> protection",
> "open-circuit protection", and "earth leakage
> protection." Am I correct in
> guessing that a DVM looks like an open circuit to the
> transformer and it is
> shutting itself off? For that matter, anything you
> test with a BVT will
> have such low current that everything would look like an
> open circuit. Why
> are neon transformers touted as useful for this purpose?
>
> Steve, KK7UV
>
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