Device for testing transformers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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In [1], a technique for determining short-circuited turns in transformers is given. Based on this method, the author made a device, the circuit of which is shown in the figure.
(click to enlarge)
This device allows you to determine the health of the transformer by the quality factor of the winding, wound with a thick wire and with a small number of turns. Especially effective is the use of the device for testing transformers with a ferrite core: TVS, TDKS, TPI, as well as ignition coils for vehicles. The device operates in the frequency range of 0,37...24 kHz. The tested transformer is connected to terminals X1, X2. By manipulating R1 and toggle switches S1, S2, tune in to resonance. If it is possible to achieve RA readings greater than without a transformer and with S1, S2 turned off, then the transformer can be considered serviceable.
When assembling, you need to know that R1 is two variable resistors assembled in one package and changing synchronously. Capacitors C1 and C2 are adjusted within small limits to obtain a maximum sinusoidal and uniform signal at all frequencies at pin 13 of the microcircuit. Instead of diodes VD1, VD6, you can use other high-frequency diodes. Instead of PA, you can use any pointer level indicator of the recording level of a consumer audio tape recorder.
References:
- Rodin A.V., Tyunin N.A., Morozov I.A. Repair of imported TVs. Issue. 9. - M.: Solon, 1997. - S.241
Author: S.B. Koba
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