Thanks for your help Audio Guru
, I will use this conversation has a reference, thank you.
However i think my oscilliscope is broke
. I'm using an old phillips PM 3215, I think it uses an old electron beam inside. The signal only shows up on one half the screen and when i change the x position it goes into a ball of light in the center of the screen. Also the ground refrence keeps changing, I think, becuase i keep having to zero it and then set it again?
I have recently been doing my work in the garage and maybe the harsh conditions have broke it.
I can't real'y do any more digging without an oscilloscope
.
Has any one experienced this before?
Is it worth taking it apart? maybe one of the magnetic plates, which direct the beam has got stuck!?
Do you know where i can buy a cheap but modern oscilloscope?
Thank you