How to check a GFI transformer

On the videos you will see a method of checking if a transformer is working properly.
This method is widely used by many sign maintenance people and has been for many years.
And the reason is because it’s fast and easy.
You will get to know, on this website the most practical and fastest way to diagnose a neon illuminated sign.
Not only by what i have been  taught, but by what other very experienced sign maintenance  people have told me.
You learn from other peoples tips and trick as you go.

How do GFI transformers work.

Using A True RMS Voltmeter


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