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 2.GQ Geiger Muller Counter
 GMC 500+ . Seems a problem with tube 2

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T O P I C    R E V I E W
sakhan Posted - 11/25/2024 : 09:00:46
I purchased 500+ in june 2023. However whereas the tube 1 at 38.67 % displays a voltage of 414 V that of tube 2 at 36.67 % gives CPM of 1PM and 12 V. What is the problem? After opening the casing the tube 2 appears a small around an inch or so object wrapped up in a black casing.
Factory default was set.
A slow decrease in voltage to 12 V is noticed after swirching from tube 1 to 2. Probably power capacitor leaking through a RC network.
4   L A T E S T    R E P L I E S    (Newest First)
sakhan Posted - 11/29/2024 : 20:00:50
Difficult to comprehend.
EmfDev Posted - 11/29/2024 : 11:52:09
CPM in calibration 2 under calibration settings on the main menu.
sakhan Posted - 11/29/2024 : 09:22:24
quote:
Originally posted by EmfDev

Tube 2 now only works at high radiation. Low voltage to conserve power.

Thanks. What is the working threshold?
EmfDev Posted - 11/27/2024 : 12:18:17
Tube 2 now only works at high radiation. Low voltage to conserve power.

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