PSDS82/18只要用万用表测量一下三个极之间的电阻值就可以。 　　
阳极与阴极之间的正向和反向电阻在几百千欧以上，
阳极和控制极之间的正向和反向电阻在几百千欧以上（它们之间有两个P-N结，而且方向相反，
因此阳极和控制极正反向都不通）。 　　
PSD51/08
PSD51/12
PSD51/14
PSD51/16
PSD51/18
PSD55/08
PSD55/12
PSD55/14
PSD55/16
PSD55/18
PSD61/08
PSD61/12
PSD61/14
PSD61/16
PSD61/18
PSD63/08
PSD63/12
PSD63/14
PSD63/16
PSD63/18
PSD75/08
PSD75/12
PSD75/14
PSD75/16
PSD75/18
PSD83/08
PSD83/12
PSD83/14
PSD83/16
PSD83/18
PSD95/08
PSD95/12
PSD95/14
PSD95/16
PSD95/18
PSDH75/08
PSDH75/12
PSDH75/14
PSDH75/16
PSDH90/08
PSDH90/12
PSDH90/14
PSDH90/16
PSDT39/08
PSDT39/12
PSDT70/08
PSDT70/12
PSDT70/14
PSDT70/16
PSDT74/08
PSDT74/12
PSDT74/14
PSDT74/16
PSDT75/08
PSDT75/12
PSDT75/14
PSDT75/16
PSDT90/08
PSDT90/12
PSDT90/14
PSDT90/16
PSDT110/08
PSDT110/12
PSDT110/14
PSDT110/16
PSDT175/08
PSDT175/12
PSDT175/14
PSDT175/16
PSDS62/08
PSDS62/12
PSDS62/14
PSDS62/16
PSDS62/18
PSDS63/08
PSDS63/12
PSDS63/14
PSDS63/16
PSDS63/18
PSDS82/08
PSDS82/12
PSDS82/14
PSDS82/16
PSDS82/18
PSDS83/08
PSDS83/12
PSDS83/14
PSDS83/16
PSDS83/18

SW12PHR300
SW14PHR300
SW15PHR300
SW02HHN300
SW04HHN300
SW06HHN300
SW08HHN300
SW10HHN300
SW12HHN300
SW14HHN300
SW15HHN300
SW02HHR300
SW04HHR300
SW06HHR300
SW08HHR300
SW10HHR300
SW12HHR300
SW14HHR300
SW15HHR300
SW16PHN320
SW18PHN320
SW20PHN320
SW22PHN320
SW24PHN320
SW16PHR320
SW18PHR320
SW20PHR320
SW22PHR320
SW24PHR320
SW16HHN320
SW18HHN320
SW20HHN320
SW22HHN320
SW24HHN320
SW16HHR320
SW18HHR320
SW20HHR320
SW22HHR320
SW24HHR320
SW16PHN380
SW18PHN380
SW20PHN380
SW22PHN380
SW24PHN380
SW16PHR380
SW18PHR380
SW20PHR380
SW22PHR380
SW24PHR380
SW16HHR380
1MBI800U4B-120
2MBI75U4A-120
2MBI100U4A-120
2MBI150U4A-120
2MBI150U4B-120
2MBI150U4H-120
2MBI200U4B-120
2MBI200U4H-120
2MBI200U4D-120
2MBI300U4H-120
2MBI300U4E-120
2MBI400U4H-120
2MBI450U4E-120
2MBI100U4H-170
2MBI150U4H-170
2MBI200U4H-170
2MBI300U4H-170
2MBI400U4H-170
6MBI50U4A-120
6MBI75U4A-120
6MBI75U4B-120
6MBI100U4B-120
6MBI150U4B-120
6MBI225U4-120
6MBI300U4-120
6MBI450U4-120
6MBI75U4B-170
6MBI100U4B-170
6MBI150U4B-170
6MBI225U4-170
6MBI300U4-170
6MBI450U4-170
6MBP15RH-060
6MBP20RH-060
6MBP30RH-060
6MBP50RA060
6MBP75RA060
6MBP100RA060
6MBP150RA060
6MBP200RA060