How to Use an ohmmeter or voltmeter verify of a Power Transformer

TROUBLESHOOTING OF TRANSFORMER  AND CHECKS

Transformer can fails down in many ways. Some of the various failures are:

• Wire coil rotating to can open.
  

• This can happen where  a copper wire coil connected with the terminal lugs.

• Transformer coil windings can make a break in the lines near the coil wire .Can be shortened

• Transformer coil windings of primary and secondary can become shorted to another one.

• Transformer coil windings of primary and secondary leak can develop high resistance.

• Transformer coil windings due to the collapse of the metal core insulation, If transformers, or frame.

• Power a Transformer may heat up , and start leaking of wax material Issue and perhaps smoking and burning.

If you recognize your own equipment burning smell and look up some of the wax is melted Inside the enclosure located in the adapter, power supply and make it immediately turn off or disconnect the device. You may find the same symptoms, if your equipment stops dawn working and valves. Usually will not be harmed power transformer over-heated problem that caused this situation is part of another component has to shorten Outside.Such failures of components will be shorten average diode, capacitors electrically candidate, Transistor regulator or bypass capacitors. You can use the meter to check the resistance of all the shorts Or low resistance in the B+ Supply lines .Below in the figure shows how you can check the leakage between the primary and secondary of the transformer.With the primary winding voltage DC powered and any effort measurement with your voltmeter excellent points on two minor fluctuations. If you find even a very small force, it has the adapter and leakage and should be replaced. The measure is used to check the resistance across the open each winding. Make sure Power is turned off or disconnect the device for measuring resistance to test this.

           










    fig: How to use an ohmmeter or voltmeter to check windings of a power transformer

Transformer and Coil Operations

Transformer and Coil Operations

• Transformers and coils are used in most electronic consumer devices. This energy can be transforms In power supply, Radio frequency (RF) transformers and coils in the RF & IF part of Television and radio receivers ,and coils and chokes , or if the units are used to remove various types of RF and electrical interference. 

• So using program codes and steel coils And the major forms of air. Usually four or more tracks and transformers So the two lead wires connections to the coils .The name implies, the alternator" Changes " pulsed DC or AC voltage down to ( a high voltage ) or ( low to By induction from a voltage circuits ), the successive near another winding ( s ) .Only when changing the voltage to the windings Transformer action , may Such an alternative to AC ( alternate current ) voltage . If one is connected to a DC voltage Transformer primary winding, secondary winding producing a voltage pulse when connected or disconnected coil input voltage needed for an instant.

 

• Magnetic field Primary coil production (cut) across the secondary winding goes through the magnetic Second induction coil induces an AC voltage. Thus, a magnetic transfer Occur, depending on the number, AC output voltage to increase or decrease the Coil and no of turns.