PSDS112/16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）。 　　

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
PSDS112/08
PSDS112/12
PSDS112/14
PSDS112/16
6MBP300RA060
7MBP50RA060
7MBP75RA060
7MBP100RA060
7MBP150RA060
7MBP200RA060
7MBP300RA060
6MBP50RTB060
6MBP75RTB060
6MBP100RTB060
6MBP150RTBA060
7MBP50RTB060
7MBP75RTB060
7MBP100RTB060
7MBP150RTB060
6MBP25RA120
6MBP50RA120
6MBP75RA120
6MBP100RA120
6MBP150RA120
7MBP25RA120
7MBP50RA120
7MBP75RA120
7MBP100RA120
7MBP150RA120
6MBP50TEA060
6MBP75TEA060
6MBP100TEA060
6MBP150TEA060
7MBP50TEA060
7MBP75TEA060
6MBP25TEA120
6MBP50TEA120
6MBP75TEA120
7MBP25TEA120
7MBP50TEA120
7MBP75TEA120
7MBR10SA120
7MBR15SA120
7MBR25SA120
7MBR35SB120
7MBR50SB120
7MBR30SA060
7MBR50SA060
7MBR50SB060
7MBR75SB060
7MBR100SB060
7MBR25UA120
7MBR35UA120
7MBR35UB120
7MBR50UA120
7MBR50UB120
7MBR75UB120
7MBR100UB120

SW18HHR380
SW20HHR380
SW22HHR380
SW24HHR380
SW02PHN400
SW04PHN400
SW06PHN400
SW08PHN400
SW10PHN400
SW12PHN400
SW14PHN400
SW15PHN400
SW02PHR400
SW04PHR400
SW06PHR400
SW08PHR400
SW10PHR400
SW12PHR400
SW14PHR400
SW15PHR400
SW02HHN400
SW04HHN400
SW06HHN400
SW08HHN400
SW10HHN400
SW12HHN400
SW14HHN400
SW15HHN400
SW02HHR400
SW04HHR400
SW06HHR400
SW08HHR400
SW10HHR400
SW12HHR400
SW14HHR400
SW15HHR400
SW38KBR515
SW40KBR515
SW42KBR515
SW44KBR515
SW38KBN515
SW40KBN515
SW42KBN515
SW44KBN515
SW30KBR595
SW32KBR595
SW34KBR595
SW36KBR595
SW30KBN595
SW32KBN595
SW34KBN595
SW36KBN595
SW24KBR635
SW26KBR635
SW28KBR635
SW30KBR635
SW24KBN635
SW26KBN635