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 GC GMC-320S Reading range/maximum values

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Cloudburst Posted - 12/05/2022 : 21:03:35
Hello,
I recently got a GMC-320S, and i am wondering if anyone knows what is the range/maximum reading it can show. For example for mSV/h - the manual says it's 327.99 but i am not sure it's correct. The device shows 0.00, so i am not sure if it can go above 9.99 mSv/h. Also, the manual is incorrect about other things, like for example, it says the range of alarm setting is also up to 327.99 while the alarm setting doesnt go above 10.00 msv/h when i try to adjust it, so i am not sure i can trust the manual.
Can anyone let me know what the maximum reading is?
thanks!
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ullix Posted - 12/06/2022 : 00:57:16
The GMC 300 series so far had a firmware with a 2 byte word recording for CPM, which means it can go up to 2^16 = 65535 counts. With a M4011 tube sensitivity at the existing value of 154 CPM/ (µSv/h) it gives 65535 / 154 = 425.6 µSv/h, or 0.4 mSv/h.

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