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 2.GQ Geiger Muller Counter
 Geiger counter cascading		  New Topic  Reply to Topic
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Bp0103

USA
1 Posts
Posted - 03/20/2024 :  06:23:00  Show Profile  Reply with Quote
I have noticed that when exposed to my uranium ore source my GMC500+ will read a constant 290 cpm but every ~68.8 seconds the count will jump up to ~450 cpm for a second or two it will also sometimes jump down to ~150 cpm anyone know what is causing this and how to fix it?
Reply #1

ullix

Germany
1171 Posts
Posted - 03/21/2024 :  01:45:28  Show Profile  Reply with Quote
This looks very much like a defective counter.

Can you post screenshots of what a logging of data shows when you record
a) background
b) your uranium about some 10 cm away from the counter
c) your uranium as close to the counter as possible (perhaps with back plate of counter removed)

Posting logging data is also welcome; you can post data files here:
https://sourceforge.net/p/geigerlog/discussion/easyuploads/
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Reply #2

EmfDev

2250 Posts
Posted - 03/21/2024 :  09:39:06  Show Profile  Reply with Quote
Hi Bp0103 what version of 500+ do you have? Have you tried to set the fast estimate to 60seconds and test again?
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Reply #3

ullix

Germany
1171 Posts
Posted - 03/23/2024 :  07:33:50  Show Profile  Reply with Quote
quote:
Have you tried to set the fast estimate to 60seconds and test again?
@Emfdev: Do I read this right, you have just stated that FET is creating false data?

Oh, man, I am preaching this for eons, though find deaf ears only. But now you are confirming!

Do your customers a favor and have this ill-conceived "feature" removed from the firmware ASAP!!!

To all users: set FET to 60 in order to have it switched off.
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Reply #4

EmfDev

2250 Posts
Posted - 03/25/2024 :  10:02:38  Show Profile  Reply with Quote
The algorithm for previous revisions made the FET more sensitive to changes in CPS. It is still very useful for users who want to get fast measurements.
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