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Old 21st October 2005, 01:04 AM   #1
steve is offline steve  United States
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Default My new (old) oscilloscope won't sweep... any suggestions?

Other than getting a brain that is (seems I'm stuck with this old dull one). I just got an old 466 tek scope off ebay... which sort'a works... but does not display a normal sweep... I can find a beam using the beam finder, and I can get an xy display, and I can even get a single sweep .... but I can't seem to get the trigger to 'shoot'...

Its been some years since I last used a scope, probably since this scope was in its prime, but I don't think it should be that difficult to get a sweep (hey... I was so desperate that I even followed the directions in the 'instruction manual').

I hope that I'm just stupid, and some one will tell me to just push the.... button... but on the other hand, if the scope has a serious problem I need to find out now while I can still return it...

so any help will be greatly appreciated

thanks

steve
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Old 21st October 2005, 01:20 AM   #2
SY is offline SY  United States
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If there's a switch that allows selection of trigger source, set it to "auto" or "line" and see what happens.
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Old 21st October 2005, 01:43 AM   #3
steve is offline steve  United States
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This scope has three trigger modes: auto, norm, and single sweep... single sweep works... it also has a trigger source selector which includes: norm, ch1, ch2, line, ext, ext/10... (scope will single sweep when trigger source is set to line, norm, or to channel with signal). There is also a trigger display button, which doesn't sweep either, but does show amplitude change when displayed with the beam finder...

I think I've tried every conceivable combination of trigger options... but I could be wrong....


thanks again,

steve
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Old 21st October 2005, 02:02 AM   #4
SY is offline SY  United States
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How about auto and line? Do you get a sweep then?

Also, with those set, you might want to play with the holdoff and level adjustments.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 21st October 2005, 03:04 AM   #5
steve is offline steve  United States
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it works! it works!..... old buttons do get sticky... and while pushing my source buttons back and forth it suddenly gave a reasonably clean trace... Now I just have to fix the 'invert' button and I'll be able to use the second channel.


thanks again.....

steve
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