I recently got hold of a Philips 3233 oscilloscope on ebay! Its my first oscilloscope and I am quite excited to use it to learn more about analogue electronics. My current background is pretty much in just digital stuff. Unfortunately, the oscilloscope is a bit older and seems to have a few issues. I was hoping someone on the forum might be able to offer a bit of advice on figuring out how to go about fixing it.
The main issue with the oscilloscope is that both of the Y channels have this pretty terrible jitter effect on the Y-axis while the oscilloscope is placed in auto mode. I am pretty sure it should be just holding a straight vertical line.
Here is a short video of what the the jitter looks like.
https://youtu.be/AaWK73lORtgSome interesting things I've noticed about it are that both the channels seem to move up and down at the same time. There are some really long periods where the oscilloscope will hold a straight line and then some other periods where it tends to go a bit crazy.
My first thought is that maybe this kind of issue could be caused by something like a bad capacitor but that is just a guess based on the fact I think capacitors are commonly used to filter noise. Does that sound realistic?
Right now I have the oscilloscope hooked up using the power cable it comes with to an outlet. The oscilloscope also has a separate BNC power cable where it can be hooked up directly to a 24V power supply. Is this worth trying to switch over to the DC power supply to get the noise to disappear?
Is it possible that the CRT is just bad?
How would you go about diagnosing the issue?