All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  Showing No counts with GMC 300.. what to do??

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by ullix[/i] [br]It will certainly be wrong if you have zero counts. Expect something beyond 10 CPM, most likely less than 30CPM (if you lived in an area with higher background, you would probably know) There are may ways these Geiger counters can fail. Since this happened after a longer time of no use, and the batteries are ok (?), chances are the tube is broken. Open the case (careful, high voltage at the tube contacts!) and look at the tube: there should be a faint rainbow shine inside the glass tube (from a vaporized metal deposit). If this is absent, in particular when you see a powdery appearance instead, then most likely the tube is cracked, air came into the tube, and the metal vapor deposit became oxidized. A new tube is needed. If that is ok, electronic defects are the likely cause; repair is needed. [/quote]    Insert an Image File Check here to include your profile signature.