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 2.GQ Geiger Muller Counter
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Jan Veleba

Czech Republic
5 Posts
Posted - 05/25/2016 :  06:12:14  Show Profile  Reply with Quote
Hey guys

I just got my GMC - 320 plus and when I place it next to my thoriated mantle, the reading goes up as it should but when it reaches about 6 microsieverts it jumps down to 3 microsieverts and goes up again to 5 where it stops.

I would like to know if I should add up both readings like 6+5=11 microsieverts/h or is the counter just evening the counts out?

//Edit: So I've just noticed that it happens when I hit 1000CPM, can it be some problem with callibration? Like I said I got it few hours ago so it should be calibrated.
Edited by - Jan Veleba on 05/25/2016 10:31:34
Reply #1

Distelzombie

Germany
202 Posts
Posted - 05/26/2016 :  14:07:02  Show Profile  Reply with Quote
And another thread with this problem - the one I described month ago. :)

(im speaking to ZLM more than to you.)
GMC-300E+ V4.20 with sbt-11a alpha tube

My statements are "stuff-a-hobbyist-says" and not in any way professional.
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Reply #2

ZLM

1261 Posts
Posted - 05/27/2016 :  22:48:19  Show Profile  Reply with Quote
Change the calibration #3 to following will fix the problem:

Calibration point #3 CPM: 65534
Calibration point #3 uSv/h: 425.97
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Reply #3

Jan Veleba

Czech Republic
5 Posts
Posted - 05/29/2016 :  00:17:14  Show Profile  Reply with Quote
Thank you but unfortunately I'm not able to change the values. When I try it directly in the counter, it won't let me go above 32000 and when I set it over terminal in Data viewer it says that it was successfully written into unit but when I click on read from unit, it still shows those defaul values.
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Reply #4

Distelzombie

Germany
202 Posts
Posted - 05/29/2016 :  09:45:58  Show Profile  Reply with Quote
You can go over 32000. You have to use -1 which is actually 65534. At least that is what the 300+ shows if you go over 32,767, then the value counts down with a minus in front. I tested it and the negative values are actually values over 32,767.

Could you try if that works with the data viewer? I can't atm.
GMC-300E+ V4.20 with sbt-11a alpha tube

My statements are "stuff-a-hobbyist-says" and not in any way professional.
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Reply #5

Jan Veleba

Czech Republic
5 Posts
Posted - 06/09/2016 :  12:07:26  Show Profile  Reply with Quote
I tried what you've suggested but I was able to get to -4 only for some reason and when I input it over the terminal it still won't change. I've also noticed that every setting I change resets after I turn the unit off and on again.
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Reply #6

ZLM

1261 Posts
Posted - 06/09/2016 :  16:58:51  Show Profile  Reply with Quote
The firmware version 4.0 or later implemented the safe upgrade via USB mechanism. The V3 upgrade is not easy as V4 and it has chance to lock up the unit if the upgrade fail. Once upgrade fail on V3, the only way to recover is to send the unit back to GQ. Unless you are very good in electronics.
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Reply #7

Jan Veleba

Czech Republic
5 Posts
Posted - 06/11/2016 :  06:39:29  Show Profile  Reply with Quote
I have V4 and firmware version is 4.13
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Reply #8

ZLM

1261 Posts
Posted - 06/11/2016 :  07:28:45  Show Profile  Reply with Quote
The problem been fixed since Ver.4.14.
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Reply #9

Jan Veleba

Czech Republic
5 Posts
Posted - 06/12/2016 :  08:10:53  Show Profile  Reply with Quote
I can't find a new firmware anywhere, how do I update it? Sorry if this is a silly question.
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Reply #10

ZLM

1261 Posts
Posted - 06/12/2016 :  22:02:58  Show Profile  Reply with Quote
check with support@gaelectronicsllc.com
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