Under amateur conditions, a multimeter can be used to detect the unidirectional conductivity of fast recovery and ultra fast recovery diodes, as well as the presence of internal open circuit and short circuit faults, and to measure the forward conduction voltage drop. If equipped with a megohmmeter, it can also measure the reverse breakdown voltage. Example: Measure a C90-02 ultra fast recovery diode, whose main parameters are: trr=35ns, Id=5A, IFSM=50A, VRM=700V. Set the 500 type multimeter to R × First gear, read the forward resistance as 6.4 Ω, n '=19.5 grid; The reverse resistance of fast recovery diodes is infinite. Further obtain VF=0.03V/grid × 19.5=0.585V. Prove that the pipe is good.
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