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I’ve recently come into a people’s with my fluke T130 I’ve been proving it recently on my fluke proving unit and it shows 60v then ramps up to 90v and cuts out I then put it back on and it ramps up to 160v then cuts out I then do it again and it goes to 261v and cuts out! I’ve tested my proving unit on various testers and it seems fine with everything else! What could this be??