Any good multimeter should be fine for this. You could measure phase to phase voltage, and check frequency. I have a mid range Fluke meter which could do this test easily (I recall it can measure 1000v) -J On Mon, Jul 10, 2017 at 2:01 PM, Ben Greenfield via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:

---------- Forwarded message ---------- From: Ben Greenfield <ben@cogs.com> To: vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> Cc: Herb Johnson <hjohnson@retrotechnology.info> Bcc: Date: Mon, 10 Jul 2017 14:01:01 -0400 Subject: Re: [vcf-midatlantic] Off topic-testing 3 phase power Hey Herb,

The only thing I can say in my defense is that one can be both naive and have respect for electricity. As for a professional, I have one involved. Unfortunately my natural curiorsity keeps me from being passive during integration of this project.

I could have gotten into all sorts of esoteric details about what I’m really trying to troubleshoot but I really wanted a simple answer, which I got from Bill Dudley. Bill’s answer was simple and re-enforced my beliefs on the subject.

Regarding testing equipment. I believe the Fluke I referenced was proper testing equipment and I wanted to see what others thought. I included a link to it’s page it is rugged 4 channel 100 Mhz portable oscilloscope. This looks like the ultimate tool for this type of work and I wanted to know what other’s thought.

http://en-us.fluke.com/products/portable-oscilloscopes/fluke-190-ii- portable-oscilloscope-190-104.html

I followed list guidelines by marking the post off-topic. I felt it was a fair question in a hacker environment and I thought others may have first hand experience they could share.

I was satisfied with answers I did receive and I love that the list exists as resource for hacking questions for all sorts of technology.

Thanks,

Ben

...

On Jul 10, 2017, at 12:45 PM, Herb Johnson via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:

Ben Greenfield has asked about testing a 50Hz 400 volt 16 amp outlet.

Without going on about it: something in Ben's request, doesn't feel "right". This is a dangerous circuit. I don't give public advice about things that put people at risk.

Ben, consult with a local qualified electrician, about whatever you have in mind. If such circuits are unfamiliar to you, if you don't have appropriate LINE TESTING test equipment - get someone who IS familiar and local and qualified.

Herb Johnson

-- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net

-- Jason Perkins 313 355 0085