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 2.GQ Geiger Muller Counter
 Stock GMC-320+ reading no CPM when in standby
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10 Posts

Posted - 04/08/2016 :  16:51:37  Show Profile  Reply with Quote
At less than a year old this started happening, on startup it appears to work normally, then drops to 0-1 CPM. (The unit has been on for most of this time)

Plugging the unit in starts the detections again but once the unit enters power saving mode, the detections stop.
When I take the unit out of "power saving" mode, the detections start again but taper off back to 0 not before long.

Is this how the m4011 behaves at the end of it's lifespan or am I looking at a more serious problem?
I have a TERRA-P, when that reached the end of it's life the readings were very high.
Reply #1


1115 Posts

Posted - 04/10/2016 :  20:26:38  Show Profile  Reply with Quote
You need to check the tube voltage. If the voltage is OK, then the problem may be the tube.
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