EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: cdev on April 20, 2015, 01:34:45 pm
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Hello,
A bit less than a year ago I purchased an old Tek 2211 for a bit less than $100 which even uncalibrated has been really useful for me. Over that time I have been looking for a service manual for it. I have manuals for some similar models but none of them appears to be quite adequate for what i would like to do which is replace any capacitors that are out of spec and calibrate it. For the most part it seems close enough for a lot of what I do but there is no substitute for following the manufacturers procedure so I could have confidence in it as a measurement tool. The worst thing that I found which is clearly out of calibration is the "1 khz" square wave - which is now 991 Hz.
Does anybody know where I could find the service manual or whatever info I would need to calibrate it and deal with anything that is out of whack?
Its a fine scope, its not too large but it clearly is a good quality construction, the CRT appears to be in decent shape and I would love to fix it up a bit (perhaps with a quieter fan) so I could get many years of use out of it. It has the 500 uv range which makes it a very useful tool for a lot of things. It even has a RS232 port so it can send screen captures to a serial port in HPGL.
Thank you!
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The worst thing that I found which is clearly out of calibration is the "1 khz" square wave - which is now 991 Hz.
That's ok. It's specified 1kHz +/-20%. For probe adjustment an accurate frequency is not needed. It's probably not adjustable anyway.
About the service manual. You can buy it from http://artekmanuals.com/. (http://artekmanuals.com/.) But you can look at manuals from similar Tek scopes (2212?) first. To get an idea how to adjust these scopes and what equipment do you need.
Before adjustments or replacing components do the performance verification tests. If it's not broken, don't fix it.