One question, again!
I measured the composite video signal by setting the display to PM5644 test card. The problem is that although setting to time/div = 5,10,20 micro second, volt/div = 200, 500 milli volts, and trigger values around 40,
344,420 and -100 milli volts, I just could not get the stable captured waveform. (colour burst was clearly seen in each wave from, but there are several different patterns displayed every time I pressed the RUN/STOP button.). Isn't it normal? I am using TDS 744A 500 MHzz Tektronix oscilloscpe. More over I would like to have the best possible settings for measuring Y Pb Pr and S Video Y, C signals. Can anybody share me the links for example measurement of those video signals? Or some example waveforms. I have some measured waveform but still I would like to have more just for knowledge.