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 2.GQ Geiger Muller Counter
 GMC 500+ ACPM value
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BrianG61UK

United Kingdom
24 Posts

Posted - 10/22/2017 :  09:47:16  Show Profile  Reply with Quote
Since I did "REset Total Count" the ACPM value is wrong.
How do I reset the timer so that the ACPM value is again the correct average of my CPM readings?

Brian Gregory (in England)
Reply #1

ZLM

1183 Posts

Posted - 10/22/2017 :  10:31:24  Show Profile  Reply with Quote
I just tested the "Reset Total Count" , and it works fine. After reset the total count, then the ACPM should be 0.
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Reply #2

BrianG61UK

United Kingdom
24 Posts

Posted - 10/22/2017 :  11:58:36  Show Profile  Reply with Quote
quote:
Originally posted by ZLM

I just tested the "Reset Total Count" , and it works fine. After reset the total count, then the ACPM should be 0.


Please engage brain before answering.

Believe it or not, I'm not bothered about the value immediately following resetting total count, rather the values later on that are expected to have some meaning.

The A stands for average so ACPM should be the average of all CPM readings since some point in time.

It was this when I first switched the unit on from brand new but now it isn't, it's some meaningless lower value.

Brian Gregory (in England)
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Reply #3

BrianG61UK

United Kingdom
24 Posts

Posted - 10/23/2017 :  05:34:46  Show Profile  Reply with Quote
I think I have discovered the answer myself.
It seems that bizarrely if after changing the settings, I switch the unit off and on again I get more sensible ACPM results.
It's obviously a bug.

Brian Gregory (in England)

Edited by - BrianG61UK on 10/23/2017 14:11:41
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Reply #4

ZLM

1183 Posts

Posted - 10/24/2017 :  14:40:59  Show Profile  Reply with Quote
I understand now.

The ACPM is calculated from (total Cont)divided by(total minute since power on).

Since reset total count only reset the count, not power on time. So the new ACPM will be (new total count)/(total minute since power on).

I think we need to define when the ACPM should be calculated.
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Reply #5

BrianG61UK

United Kingdom
24 Posts

Posted - 10/25/2017 :  17:25:54  Show Profile  Reply with Quote
quote:
Originally posted by ZLM

I understand now.

The ACPM is calculated from (total Cont)divided by(total minute since power on).

Since reset total count only reset the count, not power on time. So the new ACPM will be (new total count)/(total minute since power on).

I think we need to define when the ACPM should be calculated.



So at the moment, ACPM is as good as useless unless you figured out what was going on and both reset the total and switched off and on again!!

I think it needs to be changed.

Brian Gregory (in England)
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