Isolation Transformer Questions

[Krankshaft]

Well I just got my 450VA Tenma isolation transformer today my matching 450VA variac is coming tomorrow. No more hot chassis shocks for me .

I chose this one because I like the neat and tidy case so I don't have to look at a hunk of iron on my workbench all the time .

I decided to crack it open and take a look since the casing cover came with a nice ding in it and I had to bend it back and repaint it . Nothing damaging just asthetic and enough to annoy me. Oh well send a heavy 17 pound transformer across the country and what do you expect?

Anyways when I opened it I noticed two sheets of paper coated with a clear substance. Laquer or acetate or something which was draped over the left hand side of the transformer.

What are these for to prevent the wires from getting pinched when the casing was installed?

There were two sheets together on the left side I think that they should be on either side like in the pic. Can't trust the cheap Chinese labor.

Or should I just chuck them?

I am still waiting for the fresh coat of paint to dry for the cover so it will be open for awhile.

On a related note when I tested the isolated output it was actually higher then the line voltage. Line voltage (at the primary was) 122 VAC and on the isolated secondary it was 130VAC.

Doesn't this mean that this isn't a true 1:1 transformer and it's actually boosting a bit?

Thanks

[Krankshaft]

Re: Isolation Transformer Questions

Or is the higher voltage the result of me measuring without a load?

So if it was loaded down the output voltage would drop?

[Krankshaft]

Re: Isolation Transformer Questions

Whoops I didn't put this in the test equipment section.

Sorry about that hopefully a mod will put it in it's proper place.