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 2.GQ Geiger Muller Counter
 GMC 500+ . Seems a problem with tube 2		  New Topic  Reply to Topic
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sakhan

Pakistan
3 Posts
Posted - 11/25/2024 :  09:00:46  Show Profile  Reply with Quote
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.
Edited by - sakhan on 11/26/2024 07:22:40
Reply #1

EmfDev

2259 Posts
Posted - 11/27/2024 :  12:18:17  Show Profile  Reply with Quote
Tube 2 now only works at high radiation. Low voltage to conserve power.
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Reply #2

sakhan

Pakistan
3 Posts
Posted - 11/29/2024 :  09:22:24  Show Profile  Reply with Quote
quote:
Originally posted by EmfDev

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

Thanks. What is the working threshold?
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Reply #3

EmfDev

2259 Posts
Posted - 11/29/2024 :  11:52:09  Show Profile  Reply with Quote
CPM in calibration 2 under calibration settings on the main menu.
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Reply #4

sakhan

Pakistan
3 Posts
Posted - 11/29/2024 :  20:00:50  Show Profile  Reply with Quote
Difficult to comprehend.
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