5 , bidirectional diode ( also known as protection diode ) method :8XZservice manual download site
     1 ) The instrument is set to the highest resistance range ;8XZservice manual download site
     2 ) Disconnect the wires , the protection diodes separated from the circuit ;8XZservice manual download site
     3 ) normal phenomenon should be tested at both ends of the protection diodes from two directions , the resistance value is infinite. If it is damaged , will exhibit continuity in one or two directions .8XZservice manual download site

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