![]() Label each line with the appropriate IB value. Create a graph using excel for the data in Figure 8. ![]() Create a graph using excel for the data in Figure 6, plot V2 vs Ic for each 15 data set. Ich UBE Forward-active mode "BE sic Slope = AUCE "RE URE -VA TCE Figure 5.14 Current-voltage characteristics for the common-emitter circuit, showing the Early voltage and the finite output resistance, To, of the transistor 1. Analysis: This should look similar to the operating region of characteristic curves in your textbook on page 297 Figure 5.14 below: Within its operating range, what kind of source (voltage or current) does the transistor act like? How is it controlled? Explain. 40 LA Figure 9: PNP I Data IB Ideal V2 = 3V V2 = 4V V2 = 5V V2 = 6V 10 μΑ 20 με 30 μμ 40 με Figure 10: PNP Beta Calculation Data Principles of Operation: 1. XSC1 Exitial YMM1 XMM 2 R1 Q1 )2N3906 V2 3V 100k V1 1V Figure 8: PNP Test Reference Schematic IB Ideal IC Prework Vi VRI Ів VBE (Scope) Ic V2 = 3V Ic V2 = 4V Ic V2 = 5V IC V2 = 6V 10 με 20 μΑ 30 μ. Repeat Step 4 and fill in Figure 9 and 10 When taking measurements only the oscilloscope should read a negative value. ![]() Note all the changes in polarity on V1, V2 and the meters. Using a 2N3906 transistor, build the circuit in Figure 8. It is different from the circuit in Figure 5. ![]() 2) IB Ideal V2 = 3V V2 = 4V B V2 = 5V V2 = 6V 10 μΑ 20 μΑ 30 μΑ 40 μΑ Figure 7: NPN Beta Calculation Data Take care building the next circuit. Using your data from Figure 6, calculate Beta (B) where, Ів for all the combinations in the table in Figure 7 B=10 (eq. Repeat this for all the values of IB 18 Ideal IC Prework V1 VRI IB VBE (Scope) IC IC Ic IC V2 = 3V V2 = 4V V2 =5V V2 =6V 10 μΑ 20 μΑ 30 μΑ 40 μΑ Figure 6: NPN Ic Data 5. Adjust V2 to the next voltage level and record. Record – V1, Vri, IB Calc, VBE, and = 3V b. Set V, so that IB Calc is = 2uA from IB Ideal, Set V2 = 3V a. 1, then adjust the voltage supply until the desired value of Ih is achieved. Use the power supply for V1, set the voltage to the value calculated using the formula in eq. Measure Rį for your calculations - Ri- Now use the formula V (R1 X IB Ideal) + 0.7 V (eq. xsei XML XMM2 R1 Q1 2N3904 V2 -3V 100kn VI 1V Figure 5: NPN Test Reference Schematic a. If you burn up more than one BJT you will spin the Wheel of DOOM. It will be approximately 0.7 Volts DC, add an RMS measurement to XMM1 – is set up as a current meter to measure Ic Note – It is very easy to destroy the BJT with no resistor between the Collector and Vz. It should be DC coupled and Using the Temperature Indicator Module measuring the BE junction voltage drop. from this the base current can be calculated. XMM2 – is set up as a voltmeter and used to measure the voltage drop across Rı.Remember that there will be approximately a 0.7 V drop across the base-emitter junction. A current meter can't be used here because the loading effect of the meter increases the percent error in the micro-amp range. R1 acts as both a current sense and limiting resistor. Wiring the transistor terminals incorrectly can result in the destruction of the BJT. Emitter and Collector are identified and placed correctly. You do not need any oscilloscope screen shots for this lab. Part 2: In this next section of the experiment, it is important to take your time follow the directions, and perform all the measurements correctly. XM1 B B Q1 2N3906 E E Figure 3: PNP Forward Bias Base to Emitter Test Example Base/Collector Junction Base/Emitter Junction PNP Test Forward Bias Reverse Bias Figure 4: PNP Diode Test Results Using the Diode Test on the DMM, test a 2N3906 PNP BJT and record the junction combinations of transistor listed in Figure 4. XM1 Q1 2N3904 B E E Figure 1: NPN Forward Bias Base to Emitter Test Example Base/Collector Junction Base/Emitter Junction NPN Test Forward Bias Reverse Bias Figure 2: NPN Diode Test Results 2. Using the Diode Test on the DMM, test a 2N3904 NPN BJT and record the junction combinations of transistor listed in Figure 2. Procedure: Part 1: Diode Functionality Test The Diode check function of DMM can be used to test if a BJT is operational 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |