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 2.GQ Geiger Muller Counter
 500+ Over Saturated
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Pilot25dmc

United Kingdom
20 Posts

Posted - 04/02/2020 :  05:31:14  Show Profile  Reply with Quote
I have a Radium Dial which measures 1.2mSv/h with a basic Terra-P and a laboratory standard Thermo Fisher 900.

I attempted to get a measurement with my 500+ but it goes totally nuts, the display flashes and flips orientation constantly, it gets as high as 199uSv/h then drops to 30uSv/h instantly. I even tried the different fast estimate modes and the same thing happens.

Not particularly happy, seeing as this meter is supposedly capable of measuring levels above 42000uSv/h!

Can anyone shed any light on what my issue is?
Reply #1

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/02/2020 :  06:41:55  Show Profile  Reply with Quote
Think I fixed it. I turned off the second tube.
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Reply #2

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/02/2020 :  12:11:55  Show Profile  Reply with Quote
Is this a common problem?

What is the most up to date firmware version?
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Reply #3

EmfDev

1243 Posts

Posted - 04/02/2020 :  13:04:09  Show Profile  Reply with Quote
Hi Pilot25dmc,

Looks like there is problem with the tube 2. It can be because the voltage of tube 2 is a little bit high or tube 2 is damaged. Can you try to decrease the Tube 2 Voltage in the settings by about 2 or 3 percent and check again?

You can also send me an email with your serial number so I can check your firmware.
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Reply #4

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/04/2020 :  15:34:30  Show Profile  Reply with Quote
Lowering the voltage on tube 2 didnít make any difference sadly.

I will grab the serial number and send it tomorrow.
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Reply #5

Damien68

France
241 Posts

Posted - 04/04/2020 :  22:27:49  Show Profile  Reply with Quote
it looks like a power supply issue.
is it powered by the usb socket?
you could try changing the 3v7 battery if you have another one.

Mastery is acquired by studying, with it everything becomes simple
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Reply #6

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/05/2020 :  03:44:04  Show Profile  Reply with Quote
Yeah, its powered on 24/7 and constantly connected via USB into a 240v outlet.
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Reply #7

Damien68

France
241 Posts

Posted - 04/05/2020 :  05:45:06  Show Profile  Reply with Quote
to be sure, you can try to disconnect the USB to know if the lithium battery is always good. a good battery is necessary because in certain cases the peak power supplied only by the USB can be limited.

Mastery is acquired by studying, with it everything becomes simple

Edited by - Damien68 on 04/05/2020 05:47:50
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Reply #8

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/05/2020 :  07:23:04  Show Profile  Reply with Quote
Each time I have tested it the USB has been removed and its been running on the internal battery.
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Reply #9

Pilot25dmc

United Kingdom
20 Posts

Posted - 04/05/2020 :  07:24:57  Show Profile  Reply with Quote
With the USB removed the voltage is 4.16v.
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Reply #10

Damien68

France
241 Posts

Posted - 04/05/2020 :  11:12:57  Show Profile  Reply with Quote
Ok it's strange that it affects the display and/or accelerometer

Mastery is acquired by studying, with it everything becomes simple
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Reply #11

CrocodileDandee

Australia
55 Posts

Posted - 07/06/2020 :  05:32:56  Show Profile  Reply with Quote
Iím a newbie and surprised that a lot of problems occurred have to do with the second tube. Iím interested in buying the 500 Plus but I worry as a greenhorn how to disable the second tube. Is this a common problem? I just want a good device which is close to the real measurement and not a faulty device I have to adjust before itís fully working. Iím between the 320 and 500 Plus and the only thing scaring me to buy the 500 Plus is all those problems with the second tube.
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