I spent this morning trying to track down a clock problem only to find out that it was the scope and not the clock. Wasted morning.
I was looking at a 24MHz clock. The good scope (a TDS520B) was being used so I figured for only 24MHz I could use the Tek 2430A (a 150Mhz,100M/s scope. The clock looked like a sine wave (not square) had bad - visible, jitter and seemed to be amplitude modulating at some lowish frequency. Three issues. Looking at it with my trusty 2430A (also a 150Mhz but analog scope) and TDS520B it looked as it should.
I'm wondering if the issue was solely to low a sample rate (only 4 samples per clock). I had hoped to upgrade the TDS scope and get rid of the 2430A but I can't afford what I want now. So I was thinking of getting a 2440 (300Mhz, 500m/s ) but if I can't look at a 50MHz square wave accurately with it then it won't do me much good. That would be 10 samples per clock at 50Mhz. Since there were three issues with looking at it with the 2430A I wonder if all three can be explained and will not be issues with the 2440 at 2x the frequency and 5x the sample rate.
Is this going to work or will I be disappointed?