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468 DSO Calibration/troubleshooting


 

I have got through the calibration/adjustment procedure up to "Storage Triggering". My problems now are twofold. I can't understand Section #3 - "Check/Adjust Storage NORM Trigger DC Balance" (P4-89 in the manual). Apart from the fact that the storage triggering has a deal of jitter, I can't get step (e) to make sense. I am supposed to "use the A TRIGGER LEVEL to align the point where the sine-wave's leading edge intersects the center horizontal graticule line with the 2nd vertical graticule line". Because of the the jitter and the fact that the triggering fails when I adjust the A TRIGGER LEVEL, this is impossible. Am I doing something wrong (quite possible), or is the manual giving me the wrong information? Help!
If anyone has an idea of how I can eliminate the jitter, that would be nice, too. There is no jitter in "NON STORE" operation. I was hoping it would just be something simple like a switch needing cleaning, or an IC needing reseating, but nothing has given me any clues so far...
Colin.

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