I recently purchased a used Tektronix 2445 oscilloscope. It’s a 4 channel 150 MHz analog scope.
I also purchased a Tektronix 2430 digital scope which is en route. The digital scope has the key advantage that it can capture and display a single frame from a trigger. The digital scope will show readings from the Langmuir probe in the Sydney experiment.
It has taken me a few days of reading the manual and playing around with the scope to get a grasp. But I’m getting the hang of it, and wow… it’s a new way to explore the world!
My first discovery is that one of my bench DC power supplies is rather noisy:
The other bench power supply looks much cleaner:
But neither DC power supply is as clean as the perfectly flat signal you get from a battery.
I also used my iphone to display some sine waves:
Prometheus Fusion Perfection 