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 Isolation transformer and variac for test bench 
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Joined: Sun Aug 26, 2012 2:08 pm
Posts: 1028
Location: Lacey, WA USA
I'm putting together a box with an isolation transformer and variac (variable transformer) for our test bench.

It will be capable of a few amps (a few hundred watts) output. I found some digital voltage and current meters that are powered separately from incoming power, so they'll work fine down to 0Vac.

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http://amzn.to/2kyeO7A

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http://amzn.to/2kyt8Bd

I'll check them when they get here to see if the power supplies for each must be isolated and therefore separate.

I also wish to incorporate some of the leakage test features of the Sencore Powerite PR57/PR570 AC Analyzer.

PR57 Powerite manual:
http://drco.pairserver.com/manuals/sencore%20pr57.pdf

A bit better copy of the PR57 manual:
http://akdatabase.org/AKview/albums/userpics/10007/Sencore%20PR-57%20%20Pamphlet.pdf

PR570 Powerite II manual:
http://drco.pairserver.com/manuals/PR570-OSM.pdf

http://drco.pairserver.com/manuals/SENCORE%20PR570.pdf

PR57 Powerite $120:
https://offerupnow.com/item/detail/37745006/sencore-pr57-ac-powerite-variable-isolation-transformer-safety-analyzer

PR570 Powerite II $1116:
http://www.ebay.com/itm/NEW-Genuine-Sencore-PR570-Powerite-II-Variable-Isolation-Transformer-New-/311620492946?hash=item488e075e92:g:ELMAAOSwBPNXRule

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Steve Greenfield AE7HD


Thu Jan 26, 2017 3:22 pm
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Joined: Sun Aug 26, 2012 2:08 pm
Posts: 1028
Location: Lacey, WA USA
The variac is rated at 3A continuous, the isolation/constant voltage transformer is rated at 1A continuous. They will be individually switchable in or out of circuit, each with its own breaker.

With both out of circuit, you can monitor power draw and test for leakage current. I'm considering how best to add adjustable overcurrent trip.

I'm essentially building something very similar to the Sencore Powerite PR570.

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Steve Greenfield AE7HD


Sun Jan 29, 2017 1:16 pm
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