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 university:courses:alm1k:alm-lab-4 [03 Nov 2021 20:31]Doug Mercer [Activity: BJT Characteristic Curves] university:courses:alm1k:alm-lab-4 [02 Feb 2023 20:37]Doug Mercer add example I/V curve Both sides previous revision Previous revision 02 Feb 2023 20:37 Doug Mercer add example I/V curve03 Nov 2021 20:31 Doug Mercer [Activity: BJT Characteristic Curves] 25 Jun 2020 22:07 external edit18 Sep 2019 15:32 Doug Mercer [Activity 4: BJT Characteristic Curves] 18 Sep 2019 15:31 Doug Mercer [Questions:] 03 May 2019 11:53 Antoniu Miclaus [Questions:] 08 Jan 2018 16:06 Doug Mercer add beta vs Vce plot08 Jan 2018 15:18 Doug Mercer [Questions:] 08 Jan 2018 15:11 Doug Mercer [NPN device Directions:] 08 Jan 2018 15:10 Doug Mercer [Background:] 13 Apr 2015 17:27 Doug Mercer created 02 Feb 2023 20:37 Doug Mercer add example I/V curve03 Nov 2021 20:31 Doug Mercer [Activity: BJT Characteristic Curves] 25 Jun 2020 22:07 external edit18 Sep 2019 15:32 Doug Mercer [Activity 4: BJT Characteristic Curves] 18 Sep 2019 15:31 Doug Mercer [Questions:] 03 May 2019 11:53 Antoniu Miclaus [Questions:] 08 Jan 2018 16:06 Doug Mercer add beta vs Vce plot08 Jan 2018 15:18 Doug Mercer [Questions:] 08 Jan 2018 15:11 Doug Mercer [NPN device Directions:] 08 Jan 2018 15:10 Doug Mercer [Background:] 13 Apr 2015 17:27 Doug Mercer created Line 39: Line 39: The 0.4 V steps in the voltage driving the 10 KΩ base resistor will produce approximately 0.4 V/10 KΩ or 40 uA steps in the base current. Using the scope in XY mode plot channel CA-V on the horizontal axis (V<​sub>​CE​) and channel CA-I (I<​sub>​C​) on the vertical axis. You should see a set of 10 curves of I<​sub>​C​ vs. V<​sub>​CE,​ one for each of the 10 different base current levels. These base current levels should be approximately 0, 40uA, 80uA, 120uA ... 360uA. It may be necessary to slightly adjust the 0.6V offset level of the first step of channel B up or down slightly to insure it is right at the initial turn on value ( I<​sub>​B​=0 and I<​sub>​C​=0) of the transistor you are testing. The 0.4 V steps in the voltage driving the 10 KΩ base resistor will produce approximately 0.4 V/10 KΩ or 40 uA steps in the base current. Using the scope in XY mode plot channel CA-V on the horizontal axis (V<​sub>​CE​) and channel CA-I (I<​sub>​C​) on the vertical axis. You should see a set of 10 curves of I<​sub>​C​ vs. V<​sub>​CE,​ one for each of the 10 different base current levels. These base current levels should be approximately 0, 40uA, 80uA, 120uA ... 360uA. It may be necessary to slightly adjust the 0.6V offset level of the first step of channel B up or down slightly to insure it is right at the initial turn on value ( I<​sub>​B​=0 and I<​sub>​C​=0) of the transistor you are testing. + + {{ :​university:​courses:​alm1k:​alm_lab4_f5.png?​400 |}} + + ​Figure 1A, Example NPN I<​sub>​C​ vs. V<​sub>​CE​ characteristic curves.​ ====Questions:​==== ====Questions:​==== Line 55: Line 59: {{ :​university:​courses:​alm1k:​alm_lab4_f2.png?​600 |}} {{ :​university:​courses:​alm1k:​alm_lab4_f2.png?​600 |}} - ​Figure 2 PNP I<​sub>​C​ vs. V<​sub>​CE​ characteristic curve measurments​ + ​Figure 2 PNP I<​sub>​C​ vs. V<​sub>​CE​ characteristic curve measurements​ ====NPN Beta vs Collector Voltage Directions:​==== ====NPN Beta vs Collector Voltage Directions:​====