1: TESTING EQUIPMENTS FOR POWER THYRISTORS AND RECTIFIERS Testing equipments for power thyristors and rectifiers Testing apparatus for on-state voltage Testing apparatus for resisting performance Testing apparatus for surge current Testing apparatus for gate trigger performance and holding current Testing apparatus for critical rising rate of off-state voltage Testing apparatus for critical rising rate of on-state current Testing apparatus for circuit commutated turn-off time Testing apparatus for middle frequency current Automatic testing clamp at constant temperature and constant pressure Whole movements testing apparatus Testing apparatus for heat circulation load Testing apparatus for high temperature interdiction Testing apparatus for minority carrier life Testing apparatus for turn-on time of gate controlment Testing apparatus for critical rising rate of commutating voltage 2: TESTING EQUIPMENTS FOR ELECTRO-SWITCH AND PHOTO-SWITCH THYRISTORS Testing apparatus for electro-switch thyristors DBC-244 testing apparatus for high temperature resistance DBC-222 compositive testing apparatus for static parameters DBC-103 testing apparatus for surge current DBC-084 testing apparatus for critical rising rate of on-state current Automatic testing clamp at constant temperature and constant pressure Testing apparatus for photo-switch thyristors DBC-019 testing apparatus for on-state voltage DBC-244 testing apparatus for high temperature resistance DBC-411 testing apparatus for reverse avalanche characteristics and dynamic BOD DBC-421 testing apparatus for recovery time DBC-431 testing apparatus for critical rising rate of on-state current DBC-441 testing apparatus for resistance characteristics and static BOD 3:TESTING EQUIPMENTS FOR IGBT Testing equipments for IGBT Testing apparatus for gate characteristics of IGBT Testing apparatus for on-off time of IGBT Testing apparatus for collector-emitter voltage and cut-off current of IGBT Testing apparatus for collector-emit