Hello board,
I recently got a hold of a Techtronic 454 oscilloscope for free off of someone, shes a beauty but is misbehaving. Tried measuring a simple square wave, but it seems even with auto trigger the waveform will fade off the screen and randomly come back. I even tried to use manual triggering and for some reason it will display the waveform correctly as a square wave, but perodically will connect the spaces between the rising edges into a solid line? What is that?
Also, on the gradient screen the waveform will sometimes "drift" downward on the screen, say I had it centered on the zero line of the screen, maybe a minute later the waveform will drift and move downward?
I'm looking for someone to give advice on what could be wrong with the scope it seems to be in general working condition, especially for a 40 year old scope.