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Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
It is an Instek GOS-20 It works but the green glass over the CRT is broken Does that Glass provide X-Ray protection or was there oil in it for cooling like an old projector Television CRT?
I only ask because I don't want to destroy the first Oscilloscope I have ever had.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
I think its just a graticle, it is precisely cut you can always take it out, carefully etch the pattern on some new glass and replace it. The tubes are pretty robust though..
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
Conundrum wrote ...
I think its just a graticle, it is precisely cut you can always take it out, carefully etch the pattern on some new glass and replace it. The tubes are pretty robust though..
Thank you I have done allot research on it and they say it is one of the most versatile Oscilloscopes all though I have no probes for it so testing is hard.
Registered Member #3271
Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159
Chris Cristini wrote ...
Conundrum wrote ...
I think its just a graticle, it is precisely cut you can always take it out, carefully etch the pattern on some new glass and replace it. The tubes are pretty robust though..
Thank you I have done allot research on it and they say it is one of the most versatile Oscilloscopes all though I have no probes for it so testing is hard.
1) You can find probe sets (1X/10X) at a very reasonable price on eBay. Just make sure to match or exceed the scope bandwidth. 2) For testing I assume there should be a cal signal output on the scope you can connect directly on the channel bnc. 3) As far as the broken graticule screen this should not be a problem, but keep in mind that some scopes do use them as a secondary protection in case of CRT implosion, just in case.
No x-ray concern here. Acceleration voltage is low and, if needed, they would have used leaded glass in the front CRT tube (just like old colour TVs at 25 to 32 Kv) Scopes are typically in the 10kV or so.
Do replace it however. If something hard and sharp hits the naked CRT front glass it might break the tube. The vacuum tube implosion can send shrapnel all over. The plastic is usually about 1mm thick. In these cases it will absorb the outside or inside shock. I do not know the particular scope in question, so just look at the broken part and see if it is very thin (just to provide the scales, if not provided in the CRT to start with). If thin this assumes the implosion protection is built in the CRT front face. If it is thick, then replace it with a similar thickness of shock resistant plexi. Most modern scope have the graticule scales and the protection built in. Of course most digital scopes generate their own graticule electronically. .
They are often tinted to improve the display contrast too. See if the is important in your setup. Plexi can be obtained in many colours or just in a neutral gray. Just put the scope on the fastest sweep with a line trigger and judge the visibility of the trace.
One last comment, from past experience, older scope do tend to attract a hazy surface dust and crap coating from the electrostatic effect. Much more so if they were used in a smoking environment. I use a static resistant cleaning spray during reassembly on the CRT front glass and all plastic surfaces, with lint free gloves, so you end up with a nice display with no dust specks or fingerprint on the inside surfaces.... dont ask how I know.
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
Thanks for the comments the glass is 1/8" or so. I was thinking today about how cool it would be to make an oscilloscope you can connect to a TV with RCA cables it could be a big screen scope.
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Junk yard Oscilloscope?
