CT PT Tester switching device fatal error code

[Mukeshya1]

Universal CT PT tester showing fatal error code during accuracy measurements of CT ratio. What is the reason of fatal error code ( switching device failure)

[Kalbi_Rob]

Universal CT PT tester showing fatal error code during accuracy measurements of CT ratio. What is the reason of fatal error code ( switching device failure)

I think we would need more information about the manufacturer and model. A fatal error code could arise from an issue found during the startup script due to a bad component. Is there a error code number? maybe a picture of the error would help