Re: Scope grounding and generators


I fried my refrigerator and the digital display board in my freezer when
I connected them to a generator during a hurricane. They worked for a while
but soon developed problems. Since then I've picked up a largish 440 or 220
to 220 or 110 volt transformer with dual primaries and dual secondaries
that I can strap for the necessary voltage and I will connect my devices to
the generator through it. Hopefully it will filter out some of the voltage
spikes and higher frequencies (> 60Hz). Large transformers like this are
frequently found in large commercial machinery and there's little demand
for used ones so they aren't hard to find. The one that I have weighs about
40 pounds and is rated at 10kW IIRC so it should be able to handle my 5kW
generator. A constant voltage transformer should work even better and they
show up on places like E-bay frequently and usually sell for next to
nothing because of their size and weight and the difficulty and cost of
shipping them. I have several 300 W sized ones and they're slightly larger
than a shoebox and weigh probably 20 pounds. I've been using them on my TV
and some other equipment and none of it has ever been damaged despite
nearby lightning strikes that took out a lot of unprotected equipment. The
trick to buying things like this is to watch E-bay and look for ones within
driving distance and to pick them up in person instead of shipping. Because
of the shipping costs, these items get few bids and typically sell for the
opening bid price. Also look for a dealer in surplus industrial and/or
electronics equipment in your area.

On Sun, Oct 25, 2020 at 12:39 AM <> wrote:

Be careful connecting appliances with a standby mode to a generator. On a
couple of power cuts I connected my coffee maker to the generator and both
times fried the standby circuit.

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