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 2.GQ Geiger Muller Counter
 -IuSv/h/h displayed next to CPM

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T O P I C    R E V I E W
veritech Posted - 08/05/2014 : 04:26:25
All,
I turned on my GMC-300 today to get some samples of rain water off my umbrella after a strong thunderstorm blew through and am getting very high CPM of 60-90 and -IuSv/h/h where the uSv/h is normally displayed. These reading are from being on my desk where the CPM is usual 20-30 on any given day.

I use the 300 a few times a week and last time was yesterday and all was normal?

I have reset several times and as soon as there is any count registered the uSv/h starts displaying -IuSv/h/h.

Any ideas?

-Veritech
3   L A T E S T    R E P L I E S    (Newest First)
Alchemy2 Posted - 08/23/2014 : 09:17:59
Glad that helped!
veritech Posted - 08/21/2014 : 07:43:17
Yup that did the trick, thanks Alch!
Alchemy2 Posted - 08/05/2014 : 08:00:17
Try this just to verify that the unit is operating properly otherwise...

Go to the calibration setting and set point 1 at 152CPM, with uSv/h reading to 1.00

Point 2 make 455CPM, and set uSv/h to 3.00
Point 3, make ~910 CPM, and uSv/h to 6.00

This is basically the 152CPM = 1.00uSv/h which is supposedly the typical dosage response for the M4011 tube in lower ranges. Or, if you would rather see the default 200CPM per uSv/h, then set the three points accordingly in the same ranges manually. (like 100CPM=0.5uSv/h; 400CPM=2.00uSv/h, ~1000CPM=5.00uSv/h instead)

If your uSv/h still shows no value, then there's an issue with the reset parameters.

Good luck!

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