EXPERIMENT #4: BJT VERIFICATION MEMBERS: OBJECTIVES: Verify the integrity of the junctions of a ppp and pop transistor by means of the use of an ohmmeter Materials Needed: Transistors V1 = 2N3904 V2 = 2N3906 2N3904 Transistor Pinout 2N3906 Transistor Pinout VERIFICATION OF THE INTEGRITY OF THE JUNCTIONS OF A BJT TRANSISTOR TOPOGRAPHICAL DIAGRAM: (V1 B UH Figure 4.1 24 辜 Figure 4.2 GROUP NO: C JA V₁ Figure 4.3 2N3904 TRANSISTOR Procedure: 1 Connect the positive terminal of the ohmmeter or of an analog or digital tester, set as, to the base of the transistor V1 and the negative one to the emitter: in this way the base-emitter junction is directly polarized (Figure 4.1) 2. Write in Table 4.1 if the recorded resistance results low or high; 3. Invert the position of the ohmmeter terminals, so that the positive terminal is connected to the emitter and the negative one is connected to the base; 4. Write in Table 4.1 if the recorded resistance results low or high 5. Move the positive terminal of the ohmmeter on the base of the transistor V1 and the negative one on the collector (Figure 4.2) 6. Write in Table 4.1 if the recorded resistance results low or high 7. Invert the position of the ohmmeter terminals, so that the positive terminal is connected to the collector and the negative one is connected to the base: 8. Write in Table 4.1 if the recorded resistance results low or high; 9. Move the positive terminal of the ohmmeter on the collector of the transistor V1 and the negative one on the emitter (Figure 4.3) 10. Write in Table 4.1 if the recorded resistance results low or high. 11. Invert the position of the terminals and write in Table 4.1 if the recorded resistance results low or high. 12. Observe Table 4.1 RATING p Table 4.1 Ohmmeter terminals Low or High Measured redPositive blackNegative value (0) () ㅂ Base (B) Emitter (E) 69.7 Low OL High Low Base (B) Collector (C) Collector (C) Emitter (E) Base (B) Collector (C) Base (B) Emitter (E) Collector (C) 66.1 OL OL High High Emitter (E) OL High PROGRESS CHECK: What type of transistor is 2N3904? NPN TOPOGRAPHICAL DIAGRAM: V2 B 24 E Figure 4.4 201 Figure 4.5 as 1 V2 E Figure 4.6 2N3906 TRANSISTOR Procedure: 1. Repeat the previous operations also for the transistor V2 by setting the ohmmeter terminals like in Figures 4.4 to 4.6. 2. Write in Table 4.2 if the recorded resistance results low or high: 3. Observe Table 4.2 Table 4.2 Low or High High Low Ohmmeter terminals Positive (+) Negative (-) Base (B) Emitter (E) Emitter (E) Base (B) Base (B) Collector (C) Collector (C) Base (B) Collector (C) Emitter (E) Emitter (E) Collector (C) PROGRESS CHECK: What type of transistor is 2N3906? Measured value (0) OL 96.1 OL 104.1 OL OL High Low High High PNP SUMMARY OF FINDINGS I CONCLUSION: