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 2.GQ Geiger Muller Counter
 Zero CPM?		  New Topic  Reply to Topic
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jfin4

2 Posts
Posted - 11/09/2012 :  08:36:38  Show Profile  Reply with Quote
Routine monitoring using the GMC-300 over two weeks in the Cleveland Ohio area shows 0 CPM occasionally (once every 4-5 days). Is this just a statistical fluke or is there some other reason?

A curvefit of the data is a flat line of 20.8 CPM with a peak of 38 CPM. So I would expect 2 CPM with a similar frequency as the 38 CPM, but since I never get 40 CPM at my site, I expect no 0 CPM.
Reply #1

OnTourWithGerrit

Germany
7 Posts
Posted - 11/09/2012 :  11:41:54  Show Profile  Reply with Quote
Well, have a look inside the Counter and check the electrical connection from the tube to the onboard connections. If this is broken, the Counter is unable to count. I have had the same problem with a another counter.
Haters gona hate - also when they watch my Chernobyl-documentarys on www.OnTourWithGerrit.com
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Reply #2

jfin4

2 Posts
Posted - 11/09/2012 :  13:32:45  Show Profile  Reply with Quote
quote:
Originally posted by OnTourWithGerrit

Well, have a look inside the Counter and check the electrical connection from the tube to the onboard connections. If this is broken, the Counter is unable to count. I have had the same problem with a another counter.


No, it works fine in that it generates CPM readings with a non-zero value most of the time. But some infrequent 1 minute periods are completely zero. Statistical fluke?
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Reply #3

ZLM

1261 Posts
Posted - 11/15/2012 :  10:43:10  Show Profile  Reply with Quote
There are some problems on voltage I believe.

You can contact GQ ask for a checking. You may need to return the unit to GQ.

OR
If you know the electronics, then try to use a 1000V small (~0.1uf) capacitor, parallel to the tube two ends and see if it changes anything.
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