All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  Help! - Now my GQ 320 Plus reads between 1.9 and 3

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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 WilliamEvans[/i] [br]Hi All. I am hoping that someone can give me guidance as to what could cause this As per my previous post my GQ was reading in the thousands. ZLM recommended I get GQ to send me a replacement tube. They agreed that he was correct and were happy to send me a replacement. Almost 2 months later (post to South Africa is ridiculous) it arrived and I replaced the tube. However, the new readings are now an ACPM of between 1.9 and 3 at 100 minute counts. Where is the background radiation of 20-30? Is there a setting on the GQ 320-Plus to set sensitivity, or have I received a dud Tube, or is the whole counter faulty? [b]Image Insert:[/b][br][img]uploaded/WilliamEvans//Northgate GMC-320 Plus 20170713 ACPM-1_96 0619-0739.jpg[/img][br][size=1] 1951999 bytes[/size=1] [/quote]    Insert an Image File Check here to include your profile signature.