Jan 31, 2013 · Keep this in mind Americans that there are different color codes you might run across used in other countries particularly with direct oversea orders. Here is the front wiring terminal of a typical Mean Well adjustable power supply. This is the dangerous line voltage side: L- AC line wire (black or brown) N- AC neutral wire (white or blue)
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Resistor Color Code. The watt-meter reading indicates the input power during the test. As we have short-circuited the transformer, there is no output; hence the input power here consists of copper losses in the transformer.
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Checking An Unknown Output Transformer We can now use this knowledge to determine the impedance of any unknown output transformer. All we need to do is determine the turns ratio of the transformer, and with that information we can calculate what impedance will be reflected back to the primary with a given load on the secondary.
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So we apply an AC voltage to the primary of the transformer and we measure the output voltage to the secondary. Turns Ratio = V in (to the primary) / V out ( measured in the secondary) e.g. if we apply 5 Volts AC and we measure 0.21 Volts AC to the secondary the Turns Ratio of the transformer is : 5 / 0.21 = 23.8 That means a turns ratio 24:1
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So we apply an AC voltage to the primary of the transformer and we measure the output voltage to the secondary. Turns Ratio = V in (to the primary) / V out ( measured in the secondary) e.g. if we apply 5 Volts AC and we measure 0.21 Volts AC to the secondary the Turns Ratio of the transformer is : 5 / 0.21 = 23.8 That means a turns ratio 24:1
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If the color-coding on the leads is still readable then you only have to refer to the chart below to determine the windings. But often the color coding on the leads of these transformers has faded to the point it is difficult or impossible to read the color code and know which winding is which.