Again, the multimeter should read open circuit. This time, the multimeter should read open circuit.Ĭonnect the positive probe of multimeter to the collector terminal. Now, connect the negative or common probe of multimeter to the base terminal of the transistor.Ĭonnect the positive probe of multimeter to the emitter terminal. Again, the multimeter should give some reading. The multimeter should give some reading.Ĭonnect the negative or common probe (Black coloured) of multimeter to the collector terminal. Set the digital multimeter to Diode or Continuity range.Ĭonnect the Positive probe (Red coloured) of multimeter to the base terminal of the transistor.Ĭonnect the negative or common probe (Black coloured) of multimeter to the emitter terminal. In the same manner, we can test a PNP transistor too. We can test an NPN transistor by testing the junction's continuity in the forward bias and reverse bias mode. When the reverse bias applied to the junction, it behaves as an open circuit. The test of the transistor is based on the principle of pn-junction biasing, i.e., when a forward bias is applied to the pn-junction (by connecting positive terminal to the p-region and negative terminal to the n-region), the junction allows current to through it. By examining both the junctions (Emitter-Base junction and Collector-Base junction) with the help of a digital multimeter, we can comment on the functionality of the transistor. Basically a transistor is nothing but two pn-junctions connected back to back.

How To Use Multimeter In Urdu Pdf