Capsule Thyristor is important components. So we have to test them to make sure its quality. How to test it in a simple way? When testing, it should be clamped by a suitable clamp and then it could work normally. Because the mounting force is about 900kg in normal work condition.
We could test four parameters by this device. Turn on the device. Connect red pen to anode and black pen to cathode. Press “reset” button. Put Voltage on x10 gear, and current on 200mA gear. Rotate the “Voltage adjustment knob” while watching Oscilloscope. Stop rotating the knob after the direction of the green line changed. So VDRM is 1760Volt and Idrm is 200mA. Rotate the knob to initial position, put down Polarity button and test again as what we just do, it shows the parameter of VRRM and Irrm.
- Let’s test Trigger voltage Vgt and trigger current Igt now. Turn on the Tester. Connect A to anode, K to cathode and G to trigger. Choose Current gear and press test button, and we could see Vgt is 3.2V and Igt is 12mA.
- It’s time to testresistor by Multimeter. Put it on “200ohm” Put one pen on Anode and another on trigger. It shows gate resistor is 9ohm. Choose 20M gear. Put red pen on anode and black pen on Cathode.It shows gate resistor is 1.2Mohm.
- Tq is very important for fast thyristor. We have special equipment to test it. Connect A to anode, K to cathode and G to trigger. Turn on it. Press test button. Rotate the knob until light be red. Light is red now. We could see Tq is 18us.
- We could test Vtm by this equipment. Please adjust right current for thyristor before testing. Turn on it. Press reset button and test button. We need to remember the intinal number. Put thyristor here, connect wire to trigger. Clamp thyristor. Press test button. This number reduce intinal number is Vtm.