Dear Wildcat,
I see, the problem was that I misunderstood the concept, and there’s no system fault at all. Using manual trigger level truly solved the problem for me.
For me it is absolutely desirable to display pulsating DC “as is”, as currently I mainly measure PPM and PWM signals in lipo powered model flight hardware (that’s why I chose a pocket device that I can use at the flying fields) and the like and need to see the true voltages next to pulse width and frequency, so AC coupling is not a solution for me.
Many thanks for your efforts and pointing me to the right direction. Again have learned something!
Greetings from germany, keep up the great work
Thomas