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I think you are right. I have a Tenma scope here, and right over the ch1 and ch2 inputs it says X and Y, but there is no X-Y on the Mode switch. But looking closer I do see "X-Y" as the setting all the way CCW on the sweep knob.
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Education is what you're left with after you have forgotten what you have learned. -
Here's one for you, and this will come up once in a while when an amplifier goes unstable and oscillates at RF.
Connect your scope to your generator, so you can watch what the generator is making. Pick some audio freq you like, maybe 1kHz. I persoanlly use 100Hz more than 1k, but it doesn;t matter. Set it up so a few cycles of the waveform are on the screen. Now leave the scope alone but turn the mutliplier up on the generator, so it is making waves WAY higher than the ear can hear. 100kHz for example or 50kHz. Now instead of the few cycles, you should see a sort of band of light across the middle of the screen. WHat has happened is that the sine wave is travelling up and down many many times faster, so it is coloring in the area. Now leave THAt alone and turn the swep speed up on the scope - everything else stays the same. As you speed up the scope sweep, you will arrive at a point where that band of light starts to resolve itself into visible waveforms, and when you get to the sweep speed 100 times faster than that for the 1kHz, your 100kHz signal should wind up looking exaclty like the 1kHz did.
It would be good to know what this RF ("radio frequency") looks like in case you encounter it some day.Education is what you're left with after you have forgotten what you have learned.Comment
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Oh yeah, i see that CH.B and the Z input in back! Thanks you guys~ I was having a great time watch the plate on the pwr tube oscillate with the magnification feature at fast sweep rate. Hope i can clamp it with a big gridstopper, but it was so fun to watch, I don't wanna fix it yet! haha!!
Ya, next I'll have to find a bunch of pictures of waveforms so I'll learn what I'm seeing on the scope.
I'll look at the link, g!!Comment
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Oh, and parasitics become obvious on a scope. In real life they sound almost like a blown speaker, a sort of crackle or crunch on peaks. But on a scope you can see the little spurious waveform perched on the tops of the sine waves.Education is what you're left with after you have forgotten what you have learned.Comment
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Cuz the only one who would know how to do it would be the focus-puller, who isn't at liberty to operate outside his/her title on a union set~heehee!! But if the director could, everyone would marvel, and actually be allowed to have a capuccino from camera department's exclusive espresso machine— which would one-up the DP…etc. that's why!! haha!!Don't know why they never use that in TV/ movies, anytime I've ever seen a scope in use on TV it's showing a sine wave.
I printed out the RF exercise, Enzo. I do that tonight!Comment
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I've used automotive scopes for years, but we have way less control over the input, and time, mainly used to check ign. or charging system waveforms. My new scanner does have a 4 channel scope that I've used to check injectors, or sweep testing inputs.
Enzo's tale of checking for RF remind me of my time in the service, when we had to dial (ring) in the frequency of an obsolete radar system in service school.Comment
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I bet your automotive rig almost does more and easier than the old military monster, Bill!Comment
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