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veritech
USA
3 Posts |
 Posted - 08/05/2014 : 04:26:25
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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
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GM#-300 and GMC-200 attached to NETC.com |
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| Reply #1
Alchemy2
Canada
89 Posts |
Posted - 08/05/2014 : 08:00:17
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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! |
The more I learn, the more I realize I do not know! |
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| Reply #2
veritech
USA
3 Posts |
Posted - 08/21/2014 : 07:43:17
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| Yup that did the trick, thanks Alch! |
GM#-300 and GMC-200 attached to NETC.com |
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| Reply #3
Alchemy2
Canada
89 Posts |
Posted - 08/23/2014 : 09:17:59
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Glad that helped!  |
The more I learn, the more I realize I do not know! |
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Topic |
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-IuSv/h/h displayed next to CPM
