PSDS192/12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）。 　　

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
PSDS112/18
PSDS162/08
PSDS162/12
PSDS162/14
PSDS162/16

PSDS162/18
PSDS192/08
PSDS192/12
PSDS192/14
PSDS192/16
PSDS192/18

西玛二极管
膜盒型
SW02CXC300
SW04CXC300
SW06CXC300
SW08CXC300
SW10CXC300
SW12CXC300
SW14CXC300
SW15CXC300
SW16CXC320
SW18CXC320
SW20CXC320
SW22CXC320
SW24CXC320
SW16CXC380
SW18CXC380
SW20CXC380
SW22CXC380
SW24CXC380
SW02CXC400
SW04CXC400
SW06CXC400
SW08CXC400
SW10CXC400
SW12CXC400
SW14CXC400
SW15CXC400
SW02CXC470
SW04CXC470
SW06CXC470
SW08CXC470
SW10CXC470
SW12CXC470
SW14CXC470
SW15CXC470
SW20CXC445
SW22CXC445
SW24CXC445
SW26CXC445
SW28CXC445
SW30CXC445
SW02CXC565
SW04CXC565
SW06CXC565
SW08CXC565
SW10CXC565
SW12CXC565
SW14CXC565
SW16CXC565
SW18CXC565
SW20CXC565
SW38CXC515
SW40CXC515
SW42CXC515
SW44CXC515
SW30CXC595
SW32CXC595
SW34CXC595
SW36CXC595
SW24CXC635
SW26CXC635
SW28CXC635
SW30CXC635
SW02CXC805
SW04CXC805
SW06CXC805
SW08CXC805
SW10CXC805
SW12CXC805
SW14CXC805
SW16CXC805
6MBP75JA120
6MBP100JA120
6MBP100RS120
6MBP100RA120
6MBP150RTS120
6MBP150RS120
6MBP150RA120
6MBP150JA120
7MBR15SA060
7MBR30NE060
7MBR50NE060
7MBR50JC060
7MBP50RTB060
7MBP50RA060
7MBP50NA060
7MBP50KB060
7MBP50JB060
7MBP50RTA060
7MBP50J101H
7MBR75SD060
7MBP75JA060
7MBP75NA060
7MBP75RA060
7MBP75RTB060
7MBP75SD-060
7MBI75N-060
7MBP75JB060
7MBP80RTA060
7MBP80RT060
7MBP100JA060
7MBP100JB060
7MBP100RTB060
7MBP100RA060
7MBP100KC060
7MBI100N-060
7MBP100NA-060
7MBP100KB060
7MBR100SD060
7MBR100SB060
7MBP150RF060
7MBP150RA060
7MBP150KA060
7MBP150RTB060
7MBP150NA-060
7MBP160RTA060
7MBP200RA060
7MBP200JB060
7MBP200KA060
7MBP300RA060
7MBP300KA060
7MBP300JB060
6MBP75TEA060
6MBP100TEA060
6MBP150TEA060
7MBP50TEA060
7MBP75TEA060
7MBP100TEA060
7MBP150TEA060
6MBP25TEA120
6MBP50TEA120
6MBP75TEA120
7MBP25TEA120
7MBP50TEA120
7MBP75TEA120
7MBR10SA120
7MBR15SA120
7MBR25SA120
7MBR35SB120
7MBR50SB120
7MBR10SC120
7MBR15SC120
7MBR25SC120
7MBR35SD120
7MBR50SD120
7MBR25UA120