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Subject: Re: SCR testing

Date: 05/23/02 at 1:51 AM
Posted by: marv marcelino
E-mail: marvmarcelino@yahoo.com
Message Posted:

In Reply to: SCR testing posted by Rick on 05/16/02 at 11:20 AM:

Testing of SCR usually requires an equipment that is capable to supply the minimum holding current and the specified gate current. These parameters can be found in the datasheet of scr components.A low power scr can be test using a simple analog ohmmeter but since you are using a fluke dmm you might not be able to test the component out of circuit. However using your flashlight(the lamp actually)and a dc supply or the battery of your flashlight might solve your problem.Connect the positive supply to the anode of the scr then the cathode goes to one terminal of the lamp and the other terminal goes to the negative supply. Momentarily short the gate and the anode you will notice that the lamp will light indicating that the anode and the cathode turned on. This will latch until you disconnect the supply or momentarily short the anode and the cathode that would make the holding current drop below the minimum requirement inorder for the scr to latch.Try it and good luck!

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