[m0cemdave]

The DC resistances are not the same, due to the inner windings having shorter lengths of wire per turn than the outer ones (smaller diameter). Also note that the taps are off-centre.

I have a drawing of a UM transformer that I measured many years ago. Unfortunately I didn't note whether it was a UM0, 1, 2 or 3 but the general principle and the winding ratios will be the same. From memory (and the high resistances) it would most likely be a UM1 or UM0. The DC resistances will presumably decrease as the size of the transformer increases (thicker wire for higher currents).

There were 4 windings, each with an off-centre tap. Two windings were each approx 4H inductance The other two were approx 6H. So the turns ratios were 1:1:1.22:1.22.

The 4H windings were numbered 6-5-3 and 1-2-4 from inner to outer. The 6H windings were numbered 10-8-7 and 9-11-12 from inner to outer.

DC resistances were measured between pin numbers as:
1 - 116R - 2 - 137R - 4 (overall 253R)
6 - 77R - 5 - 104R - 3 (overall 181R)
10 - 194R - 8 - 80R - 7 (overall 274R)
9 - 243R - 11 - 112R - 12 (overall 355R)


Inductances were measured between pin numbers as:
1 - 0.95H - 2 - 1.45H - 4 (overall 4H)
6 - 0.85H - 5 - 1.35H - 3 (overall 3.9H)
10 - 3.0H - 8 - 0.7H - 7 (overall 6H)
9 - 3.2H - 11 - 0.8H - 12 (overall 6H)

The resistance measurements were made with a digital meter and will have been quite accurate, and the inductances with an old bridge so maybe within 5% or so.

I assume you have found the datasheet for these transformers, widely available online and giving the terminal connections for various matching ratios.

I hope this is useful.