Please help me figure out how to record this signal, I'm missing something that seems like it should be simple but I'm not sure what I'm looking for.
I'm using a Rigol DS2072A scope and it's got a cool feature where it only records when it thinks something is happening with the signal, so that memory isn't wasted by dead spots. I need to turn this off, the dead spots are important to me, but I don't know what setting I'm looking for.
Example case; the startup of a 12V DC power supply. The signal starts at 0V, jumps to 12V in a couple ms, then has some noise around 12V. I need to record about 2 seconds of this entire sequence. With the scope set to rising edge, DC coupling and the trigger level around 1V, I get a very nice recording of when the voltage is transitioning from 0V to 12V, but once it's at 12V the recording stops. How can I make it trigger on the rising voltage, but then keep recording even when it appears to the scope that nothing significant is happening? Did I explain this clearly?