How to Test Semiconductor Diodes Skillfully

In the figure, T is a 220/3V, 2W transformer; VD1 and VD2 are 2CP10 type rectifier diodes, LED is a green light-emitting diode, LED2 is a red light-emitting diode, VDX is inserted into sockets X1 and X2, and one of the light-emitting diodes lights up after leakage, indicating that the diode under test can be used; if both light-emitting diodes light up, it means that the diode under test has a short circuit; if both light-emitting diodes are not bright, it means that the diode has an open circuit inside. If the
light-emitting diode is not bright enough, you can adjust the resistance value of R (change the resistance value of R to a smaller value)