S6025L PDF

Their usefulness may be expanded, however, by equipping them with another means of latching. It may be latched by breakover voltage or by exceeding the critical rate of voltage rise between anode and cathode, just as with the Shockley diode. Dropout is accomplished by reducing current until one or both internal transistors fall into cutoff mode, also like the Shockley diode. However, because the gate terminal connects directly to the base of the lower transistor, it may be used as an alternative means to latch the SCR.

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A multimeter can be used to test SCRs quite effectively. The first procedure is to check the diode action between the gate and cathode terminals of the SCR.

This test is just like what you have done in the case of testing a silicon diode see testing a silicon diode. Now put the multimeter selector switch in a high resistance position.

Connect the positive lead of multimeter to the anode of SCR and negative lead to the cathode. The multimeter will show an open circuit. Now reverse the connections and the multimeter will again show an open circuit.

Then connect the anode and gate terminals of the SCR to the positive lead of multimeter and cathode to the negative lead. Now carefully remove the gate terminal from the anode and again the multimeter will show a low resistance reading indicating the latching condition.

Here the multimeter battery supplies the holding current for the triac. If all of the above tests are positive we can assume the SCR to be working fine. Circuit for testing SCR. This is another method for testing an SCR. Almost all types of SCR can be checked using this circuit.

The circuit is just a simple arrangement for demonstrating the basic switching action of an SCR. The lamp must not glow. The lamp will remain ON even if the push button S1 is released indicates the latching.

If the above checks are positive then we can conclude that the SCR is fine.

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