Hello Everyone, I just received my MSO5074 and was able to upgrade it in less than 5 min thanks to the excellent work of all the posters on this forum. I had one question, I noticed that the scope makes a very slight ticking sound that kind of borders on minor screeching when running - its barely noticeable, about as loud as an old school hard disk drive, maybe even quieter. I noticed that if I turn on and off the channels or change the V/div, the sound pauses for a moment as the waveform refreshes on the screen. The sound also varies slightly depending on the V/div I am on. I noticed this even before the upgrade. Is this normal?