This question is a bit related to an earlier question: Question
With my current scope (Philips PM 3253, 20 MHz 2 channels), I cannot measure the quality of edges from square waves from the test signal, because if I put the time to less than 1 ms, I either don't see anything or a straight line.
I assume this is a problem of the scope (it has a quite bad screen, the beam stays 'forever' or is fading away fastly, so all the time I have to press the 'reset 'beam'' button.
Is there something I do wrong? I already know I should use the 10:1 setting on the proble, but still have the same problems.
So I'm in the market for a new (old analog secondhand oscilloscope) and was wondering how to best do a test similar to this?
My idea: use a square wave (which I guess never is 100% square). I put the time to e.g. 10 us or whatever and I would see square waves which connect the 0 and 5V (or + or - volts) together with a 'rather' steep line. And I want to measure the time from 0 to 5V or vice versa. This should be something in us I assume.