First let me say I know very little about oscilloscopes but I find them fascinating. I love learning about them. A couple of years ago I was having problems with a MPU board. I was told to make sure the 5 volts was stable before the 5 volts shows up on the CPU. (See this thread: https://pinside.com/pinball/forum/topic/mpu-100-don-t-boot-on-first-try/page/2 )
I did this by attaching probe 1 to R139 and probe 2 to TP5. After several attempts I got what we were looking for. Since learning this I’ve used it several times and it’s been very useful.
Now I have a new oscilloscope (I couldn’t pass up a bargain). The following scans are from the old scope (Hantek DSO5072P) and the new scope (Hantek DSO2D15). Same MPU, same probes, same method, different scopes. I’m using the “single sequence” that is supposed to capture the moment the signal starts. The old scope catches the signal fine but the new scope seems to miss the very beginning of the channel 2 – it starts at 5 volts.
I’m sure I’m doing something wrong but I don’t know what. Anyone have a clue?
dso_01_01_00_05_06 (resized).jpg