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transformer primary/secondary identification (oep1200)

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vinodquilon

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How can I interpret the primary and secondary pins of OEP 1200 1:1 600 Ohm isolation transformer. In the datasheet I cannot find it.
Find the attached file.
 

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  • 600 oep.pdf
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For a 1:1 transformer, the input and output are interchangeable.

In general, transformers do not have a direction of signal flow. Any winding can be used as an input. For example, if you apply 12VAC to the 12V winding of a 120VAC to 12VAC transformer, you will get 120VAC at the 120V winding.
 
Triad SP-70 600 ohm : 600 ohm

For a 1:1 transformer, the input and output are interchangeable.

In general, transformers do not have a direction of signal flow. Any winding can be used as an input. For example, if you apply 12VAC to the 12V winding of a 120VAC to 12VAC transformer, you will get 120VAC at the 120V winding.

But, for Triad SP-70 600 ohm : 600 ohm audio transformer have separate primary/secondary specifications as shown in the attached files ?
 

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  • sp-70.gif
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According to this data sheet, the primary and secondary have a slightly different DC resistance. Makes it easy to use an Ohmmeter to tell which is which :)

Note that this transformer will tolerate only a small DC current in the primary; likely primary and secondary are wound with different size wire, hence the slight difference in resistance.
 
According to this data sheet, the primary and secondary have a slightly different DC resistance. Makes it easy to use an Ohmmeter to tell which is which :)

Note that this transformer will tolerate only a small DC current in the primary; likely primary and secondary are wound with different size wire, hence the slight difference in resistance.

The same connections also exists for oep1200 as narrated in the attachment below.....(thanks for FvM edaboard)
 

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  • OEP1200_new.PDF
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  • isolation(OEP1200).PNG
    isolation(OEP1200).PNG
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