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lyd
Joined: 15 Sep 2007
Posts: 390
Location: Lake Mills, Wi
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| Posted: Wed Feb 27, 2008 12:12 am Post subject: Just bought a silly scope, now what? |
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Curt wrote in another thread...
While I was still bleary-eyed and waiting for coffee to brew this morning, I followed this link and saw that there were only a few hours left on the auction with one bid. On impulse, I bid $3 more and got on with my day. Came home to find myself the owner of a used scope. 
Anyone have a couple of good pointers to write-ups on how to use it to do basic setup and calibration tasks? What patterns to use, what to connect the probes to, like that. Anything 8500 specific would be bonus.
Thanks.
lyd
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Feb 27, 2008 12:27 am Post subject: |
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Why did you buy that, it's such a piece of crap.......
 
your mission now is to figure out how to display a video image on it. I did that back in college, fun times..
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Wed Feb 27, 2008 1:51 am Post subject: |
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Hello
An oscilloscope is rather more useful for troubleshooting that calibrations, but a 'scope lets you observe complex waveforms where a voltmeter becomes useless.....
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PiDD
Joined: 03 Dec 2006
Posts: 87
Location: Winnipeg, Manitoba
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| Posted: Wed Feb 27, 2008 2:52 am Post subject: |
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I have looked at scopes myself. Those waveforms in the manuals have to tell you if your projector is out of wack.
Thanks for buying one and post the EXACT same as I would! I will follow this and hope it comes out well.
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lyd
Joined: 15 Sep 2007
Posts: 390
Location: Lake Mills, Wi
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| Posted: Wed Feb 27, 2008 2:58 am Post subject: |
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| Tim in Phoenix wrote: | Hello
An oscilloscope is rather more useful for troubleshooting that calibrations, but a 'scope lets you observe complex waveforms where a voltmeter becomes useless.....
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I was under the impression that, among the myriad other applications of thing, I could use it to check and set a few things along the lines of G2 voltages.
If nothing else, it is certainly a handy thing to have around. My experience with oscilloscopes so far is limited to some monkeying around with some radio monitoring and a bit of audio tinkering using some hackish PC software interfacing through a sound card, and even that little bit was a long time ago. I'm not completely in the dark, though, so I ought to be able to figure out how to use the thing properly without too much pain.
At the very least, I've seen descriptions of an interesting way to tweak focus using analog output from a video camera into the 'scope, and that sounds intriguing.
lyd
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Moose
Joined: 09 Mar 2006
Posts: 788
Location: Minnesota
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| Posted: Wed Feb 27, 2008 4:24 am Post subject: |
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| Quote: | At the very least, I've seen descriptions of an interesting way to tweak focus using analog output from a video camera into the 'scope, and that sounds intriguing.
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I'm rather interested in how this is done also, but I'm an oscilliscope novice too. How does one adjust focus using a camera?
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Wed Feb 27, 2008 6:07 am Post subject: |
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Now you just need a NEC that's been messed with
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Wed Feb 27, 2008 6:14 am Post subject: |
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OHHH that shouldn't be hard to find.
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CRT.
HD done right!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Feb 27, 2008 6:57 am Post subject: |
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Buying a 300Mhz scope is like buying a G90 when you haven't even done research on the dos and don'ts of CRT..
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blue_z
Joined: 27 Apr 2006
Posts: 63
Location: So Calif
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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Nashou66
Joined: 12 Jan 2007
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lyd
Joined: 15 Sep 2007
Posts: 390
Location: Lake Mills, Wi
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| Posted: Wed Feb 27, 2008 11:27 pm Post subject: |
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| Nashou66 wrote: | Now would you be able to use this method Scott, by first having the camera facing the tubes to get good electronic focus then put the lenses back on and go for the mechanical focus? I think most of us have trouble getting the mechanical focus right.
Athanasios |
If you've got the lenses off anyway you shouldn't have any problem doing your magnetic focus just looking at the tubes with, you know, your eyeballs.
It's optical focus that gives me fits. Binoculars make it worse, can't hold the damn things steady in one hand while simultaneously monkeying with the lens. I was going to just set up my camcorder running firewire into a laptop close to the projector, but figured I'd give a try to the 'scope idea since I've got the thing. (Or hopefully will get the thing, ebay being what it is.)
lyd
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Thu Feb 28, 2008 1:11 am Post subject: |
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Using a camera and scope works especially well for lens focus. You can have the scope near the projector so the indication is easy to see. Lenses are very touchy for best focus. A tiny movement makes a big difference.
The camera will probably need a lens extender tube to move the lens farther away from the internal element. That will let the camera focus when close to the screen.
Scott
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lyd
Joined: 15 Sep 2007
Posts: 390
Location: Lake Mills, Wi
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| Posted: Thu Feb 28, 2008 2:09 am Post subject: |
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| tse wrote: | Using a camera and scope works especially well for lens focus. You can have the scope near the projector so the indication is easy to see. Lenses are very touchy for best focus. A tiny movement makes a big difference.
The camera will probably need a lens extender tube to move the lens farther away from the internal element. That will let the camera focus when close to the screen.
Scott |
My GL2 will focus @ 1cm when zoomed all the way out (35mm focal length eq. of 39.5mm). That ought to work, don't you think?
lyd
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Thu Feb 28, 2008 3:48 am Post subject: |
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That should work. You actually want to have the camera "look" at a portion of the screen that's about 3" x 3". Does the camera have a video output for connecting to the scope?
Scott
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lyd
Joined: 15 Sep 2007
Posts: 390
Location: Lake Mills, Wi
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| Posted: Thu Feb 28, 2008 10:29 pm Post subject: |
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This is the best generic primer I have found so far.
lyd
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