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Old 05-26-2017, 02:39 PM
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Tubejunke Tubejunke is offline
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Join Date: Apr 2003
Location: Martinsville, VA
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Checking Signal Generator Accuracy With A Frequency Counter and Scope

Hello all! It seems the more I learn about electronics, the more I need to know. Too bad none of it makes much money these days! Anyway, I do a lot of my radio and TV work with vintage test equipment. I do it because I like the stuff which I understand causes me to have to repair my repair equipment. It would be ludicrous to many, but I have a lot of fun with it.

Anyway, I have had an old Heathkit SG-8 Signal Generator for quite a while. It's great. It needed a .1mfd cap to get going real well and operates on it's 2 original Heathkit tubes. Not long ago I purchased a cheapo frequency counter to use mainly to see how accurate the generator is. My problem is that I don't get any kind of steady reading on the counter at all, or one that coordinates with what I should be seeing. SO, I hooked the output of my function generator to the frequency counter and I get normal readings. Then I tried connecting my Oscope to the Signal Generator and I get a sine wave. The trick for me is that moving the range knob on the generator only changes the amplitude of the sine wave.

Even that change isn't a lot and the bandwidth isn't changing much if at all. I'm willing to bet that this is caused some rudimentary of fundamental of electronics relating to RF that I haven't studied enough. It has to be as I know that the Heathkit works fine and the dial accuracy can't be off by more than about 5Khz. I've seen guys in YouTube vids do what I am trying to do, but I don't think they showed how to connect everything.. I know somebody here can set me straight as the always do. Thanks in advance!
"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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