A very nice friend of mine gave me an Antek transformer with dual secondaries. I need to create a center tapped secondary to use full wave vacuum tube rectifier. It seems all I have to do is connect the “middle” pair of the two white &yellow pairs. I just don’t know how to test/check this assumption. Can I test/check that I’ve connected the correct wires with a multimeter? 😕
It is that simple. Use the multimeter to be sure that you have the yellow/white pairs for each section correct. Each section has low resistance from yellow to white and infinite resistance to other pair.
The color coding and the answer given by evanc should do the trick.
My thought was that when wired correctly resistance between the ct and the two poles should match but maybe that would be the case if wired incorrectly too, so I asked...
My thought was that when wired correctly resistance between the ct and the two poles should match but maybe that would be the case if wired incorrectly too, so I asked...
Wired incorrectly and you'll have infinite resistance from your incorrect center tap to the other wires.
Resistance checks tell you nothing about the 'phase' of the windings. Only which winding is which.
As huggygood says, you need to know the start of each winding. It is often marked with a dot or colour. For a centre tap you need join the end of one winding to the start of the other. The phase is important because you need the two voltages to add together.
Easy way if you have a part number is look it up on the AnTek web site.
If you do not have any information you need to apply power to the transformer and take a couple of ac voltage measurements.
I've found that Antek are generally very good with ensuring their wire colorings are consistent - colors will all be in the same phase.
The location of the wires on the Antek tell should you which end is which, the starts and ends are paired.
To verify just measure across the connected windings, if correct you will get double the voltage of a single winding, if incorrect you will get very close to no voltage.
To verify just measure across the connected windings, if correct you will get double the voltage of a single winding, if incorrect you will get very close to no voltage.
I believe all the Antek transformers have dual primary windings as well. You'll need to get those wired/phased correctly too.
> Seems too simple
Some buyers want CT. Others want dual secondaries. Yet others want a single secondary at 24V. Or single 48V.
Dual windings support ALL these users. The "cost" is one or two wires more than they actually need (and attendant confusion). But for a commodity industry, stocking the one part for four different uses trumps the cost of leads/lugs.
Some buyers want CT. Others want dual secondaries. Yet others want a single secondary at 24V. Or single 48V.
Dual windings support ALL these users. The "cost" is one or two wires more than they actually need (and attendant confusion). But for a commodity industry, stocking the one part for four different uses trumps the cost of leads/lugs.
Just connect them in series and measure the voltage between the two end wires. If the voltage is about equal to double each secondary voltage, you got it right. If you measure a very low value, you need to reverse one secondary. Easy.
Jan
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