RS Isolating Transformer

[Skywave]

Hi Paula and all,
I'll rephrase my original question - how do I tell if it is two secondaries on a centre tap?

Thanks

Rob

First measure the resistance between the two secondaries: should be infinite ohms. Then measure the resistance between primary and each secondary: again, should be infinite ohms. Next, measure the resistance between primary, each secondary and core in turn: 3 measurements in all: each should be infinite ohms. If any of these measurements are not infinite ohms, you have a suspect transformer.
Then power-up the primary and measure the voltages on the secondary windings (on no-load).

Al.