Hi. I'm trying to fix a Panasonic MIG welder that hums and throws the breaker when powered on. I've removed and checked the transformer, and believe it to be OK. The next thing in line is the Thyristor module Sanrex PWB130A30 non-isolated type that is mounted to a heat sink. The on line spec sheet for this module seems to say that the gate trigger voltage needs to be less than 2 volts while the on state voltage needs to be at least 1.2 volts. I was wondering if I could test this with a 1.5 volt battery or if I should use a 9 volt battery and use a resistor to get the max gate voltage below 2 volts. I want to get a trust worthy test without damaging the module(of course), if it's still good. I'm an amateur at electronics wondering how you pro's would do this. Thanks.
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