In the previous video, #190: Transistor Current Sources (link below), I made an error in my measurements because I ignored the loading effects of one of the meters. Since every mistake is really an opportunity to learn - hopefully you'll learn from my mistake! Even though there were two subtle clues that this error was there, I ignored them - shame on me!
The Simpson 260 VOM has a sensitivity of 20,000 ohms/volt. I had the meter in the 10V range, so it had an input impedance of just 200kohms, and this was in parallel with the current source. Therefore, my calculated output impedance of 190k was really dominated by the VOM, and the actual output impedance was much larger.
I apologize for the error, but hopefully there is a lesson here for you. Here is the link to the previous video - a tutorial on Transistor Current Sources: