• Tag Archives oscilloscope
  • Oscilloscope calibration, what a pain

    Awhile back, I had recieved an oscilloscope from someone. a Conar model 255 solid state oscilloscope. 

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    It worked ok but I couldnt trust the readings from it or even the voltages it displayed. I could get basic wave forms displayed and thats all I really needed it for. As time went on it started acting up. Certain setings would not display, simple sqaure waves had major overshoot …… I could go on with so many of the issues that started to appear. So today I sat down and did the calibration from the manual. What a pain.

    total time spent on it was about an hour and I did the best I could.
    I still need need to buy 2x LM733 and a 741 or a better drop in replacement, also a few capacitors and transistors. But those will have to wait till I am employed again.

    here are a few pics of the internals

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