Alright.
* I connected "EXT" to the light bulb.
* I connected CH1 to the light bulb also.
* I set the trigger source to "EXT".
* I set Coupling to AC.
* I positioned the vertical trigger line to the middle of the screen.
* I positioned the horizontal trigger line to 0V.
* I set the trigger's Edge Slope to Rising (Its either Rising or Falling, no other choice).
* The time scale is 10mSec (the line frequecny is 50Hz).
Experience's results:
1. When I turn on the light bulb, there's no trigger, the sine wave keeps going on the screen.
2. When I turn off the light bulb, then trigger happens, the problem is that sometimes you can see the cut off of the sine wave at the middle of the screen (and indeed the cut off happens close to zero
), but sometimes i see at the middle of the screen a complete sine wave, i dont see where its cut off.
3. I didnt manage to cause a trigger when I turned
on the light bulb. I tried changing the trigger's Edge Slope to Falling but it didnt help.
I dont understand, when does the trigger happen?
What should happen in the "Ext" voltage for a trigger to happen?
Is there anything I can do to fix it (what happen in result #2)?
I really thank you for teaching me this powerful measuring tool.