SCR testing
SCR testing
(OP)
Okay guys, I know I don't know what I am doing but I am trying to test a hockey puck SCR. I have a flashlight taken apart. I have the neg from battery going to negative of the light. I have the red wire from scr going to the pos of the light. I have the positve of battery going to the plate connected to the anode of the scr. I then take the white wire of the scr and touch it to the anode and the light lites up. I take it off and it goes off. This isn't the way I seen the test done online, but I couldn't get the light to do anything that way. I have several SCRs that I know some are good and some are bad. Also putting pressure on them doesn't seem to make a difference.





RE: SCR testing
Use a piece of flat metal and a weight or a drill press to apply enough force to make a reliable contact. Then run the normal test (negative to cathode and positive to anode plus a resistor from positive to gate). Size of resistor is not critical 47 ohms will usually work. Large pucks may need a lower value.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: SCR testing
RE: SCR testing
RE: SCR testing
RE: SCR testing
RE: SCR testing
Still had to clamp the hockey pucks though. I had a pair of C-clamp type welder's vice grips that worked for everything I had to test in the field, which was up to around 800A. Put a couple of big "fender washers" on the faces of the puck to protect them, then set the clamp to where I could just barely get it to squeeze and snap over to lock. Unlocking it was often an event, I learned the hard way to wrap something like my jacket around it so everything didn't go flying off and breaking things... my forehead being the first thing that clued me in.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington