Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Diagnostic & Test Equipment

We appreciate your help

in keeping this site going.
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 05-26-2017, 03:39 PM
Tubejunke's Avatar
Tubejunke Tubejunke is offline
VideoKarma Member
 
Join Date: Apr 2003
Location: Martinsville, VA
Posts: 1,823
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"
Reply With Quote
 


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:30 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.