Three Ways to Measure the Output Impedance of a Circuit or Device (066d2)

I had to measure the output impedance of the circuit I designed in the video on the multi-stage amplifier example. It occurred to me that not everyone might know how to make this measurement. So, in this video I am going to show you how we go about doing this. I will also explain the basis of these three methods. This is not just a "do as I do" video. It is an "understand what I do so you can do it, too" kind of video.
WAY#1: The Direct Loading (Single Point) Method ... the simplest, but doesn't always apply.
WAY#2: Modified Single Point Method ... this works for all the WAY#1 cases and covers most of the rest.
WAY#3: Two-Point Method ... this takes care of the remainder...works in ALL cases, but takes more time.
I have created a "go-along-with-the-video" sheet which steps through the whole process exactly as I am presenting it here. The link to this sheet is below.

I've provided links to all of the videos in this series below the time markers.

=============== LINKS =================
LINK to the promised formula sheet:
https://drive.google.com/file/d/1QHiV...
=======================================
Time Markers for Your Convenience
----------------------------
00:05 Introductory Comments
00:59 What is Output Impedance?
01:13 The Output Model
02:18 WAY #1: Direct Load/Single Point Method
05:09 WAY #2: Modified Single Point Method
08:59 WAY #3: Two Point Method
12:48 Concluding comments and Toodle-Oots

==== This video Series ====
Video#1: Introduction to the Junction Diode (How PN junctions work)
   • Introducing PN Junction Diodes (066a0)  
Video#2: Introduction to the Bipolar Junction Transistor (BJT)
   • Introducing Bipolar Junction Transist...  
Video#3: Basic Bipolar Junction Transistor (BJT) Metrics for the Experimenter
   • Basic Bipolar Junction Transistor (BJ...  
Video #4 Basic Bipolar Junction Transistor Analysis: The Model
   • Basic Bipolar Junction Transistor Ana...  
Video #5 Basic Bipolar Junction Transistor Analysis: The Common-Emitter Circuit
   • Basic Bipolar Junction Transistor Ana...  
Video #6 Basic Bipolar Junction Transistor Analysis: The Common-Collector Circuit
   • Basic Bipolar Junction Transistor Ana...  
Video #7 Basic Bipolar Junction Transistor Analysis: The Common-Base Circuit
   • Basic Bipolar Junction Transistor Ana...  
Video #8 A Beta Stabilized Common-Emitter BJT Circuit: Analysis & Design
   • A Beta-Stabilized, Common-Emitter BJT...  
Video #9 A Beta Stabilized Common-Emitter BJT Circuit: Part Selection, Reverse Engineering and Bench Results
   • A Beta-Stabilized, C-E BJT Circuit (P...  
Video #10 A Multi Transistor Example Ciruit
   • A Multi-Transistor Example Circuit An...  
Video #11 Three Ways to Measure the Output Impedance opf a Circuit or Device
** This video **