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James,
Yes, a DVM is a Digital VoltMeter, an essential basic tool for most any
electrical or electronic work.
Even a $15.00 - $45.00 economy model from any eBay source is probably
going to be good enough for basic purposes.
I don't trust the "free" toy quality DVMs that Harbor Freight gives out
occasionally. I've seen a couple of those that read zero volts when
connected across a live 120 VAC line. Not something you would want to
trust your life to.
However, do not touch any part of any meter or its leads while the
transformer is energized. Be certain to resist the temptation to change
the range settings while the transformer is operating.
Most commercial meters are only insulated to 600 VAC. 15 KV will
happily reach out and touch you right through the meter case.
If any of the windings of the NST are open circuit, then you have an
expensive paperweight. There's no way to readily repair one of these,
unless it's an old one that has suffered carbon tracking that shorts out
one of the outputs. If it is potted in asphalt, you can melt out the
asphalt (a messy, stinky process best done outdoors), and occasionally
you can resolve the short this way. With a modern epoxy potted NST, no
repair is possible.
Dave
On 6/14/2018 9:40 PM, James Janota wrote:
Ok, If the DVM is a Digital Volt Meter then I’ll do that. What should I do if it is bad?
Regards
James Janota