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 Help with GQ GMC-500
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2 Posts

Posted - 11/02/2023 :  01:26:54  Show Profile  Reply with Quote
I purchased a GQ GMC-500plus brand-new. Not much is being read by it. There's a click every few minutes. However, I'm getting nothing when I try to test fresh vials of tritium, trinitite, uranium glass, and even my smoke alarms.

Is my unit broken, or am I overlooking anything in the setup?

Edited by - solarimeter on 11/05/2023 20:51:17
Reply #1


1118 Posts

Posted - 11/02/2023 :  07:01:26  Show Profile  Reply with Quote
The background should be near CPM=20. You say you are getting like CPM=0.3? That sure is too low.

Do the usual things: make a factory reset. Take out the battery for a few seconds and reinsert, restart. Any changes?

It should show the anode voltage in the menu. How many Volts does it show?
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Reply #2


2 Posts

Posted - 11/05/2023 :  20:56:42  Show Profile  Reply with Quote
After 15 minutes, my CPM is 0 on average. not even ambient radiance.
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Reply #3


2170 Posts

Posted - 11/06/2023 :  14:52:39  Show Profile  Reply with Quote
Please try to do a factory reset. If cpm still goes to 0, you will need to go with warranty.
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