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 How to calculate ACPM and uSv/h?		  New Topic  Reply to Topic
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serial_reset

France
5 Posts
Posted - 03/31/2025 :  12:20:44  Show Profile  Reply with Quote
Hello,

Firstly, I would like to thank you for working on GMC devices.

I am logging data from a GMC-320S via serial console and I fetch CPM without problem. Data is logged to MQTT and this works like a charm.

Now I would like to calculate ACPM and uSv/h before submitting to GMC World Map. How to calculate ACPM (how many CPM values need to be taken into account) and how to convert CPM to uSv/h?

Kind regards,
serial_reset
Reply #1

serial_reset

France
5 Posts
Posted - 03/31/2025 :  12:27:50  Show Profile  Reply with Quote
Okay, I reply to myself, this is calculated to be 154 CPM for 1 uSv/hr for GMC-320/GMC-320S, right? How many records need to be taken into account for ACPM?
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Reply #2

EmfDev

2314 Posts
Posted - 03/31/2025 :  12:54:58  Show Profile  Reply with Quote
You can decide how many records do you want for ACPM.
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Reply #3

serial_reset

France
5 Posts
Posted - 04/01/2025 :  07:05:45  Show Profile  Reply with Quote
Thank you for the answer. How many records are taken into account by the GMC-320 device?
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Reply #4

EmfDev

2314 Posts
Posted - 04/01/2025 :  10:09:17  Show Profile  Reply with Quote
All time that it is on. ACPM is calculated every second.
acpm = total_count/(elapsed_second_total/60.0);
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Reply #5

serial_reset

France
5 Posts
Posted - 04/01/2025 :  11:27:22  Show Profile  Reply with Quote
As I am running Home Assistant I receive a CPM every minute. So I only need to calculte the ACPM sum divided by the number of minutes recorded (which is my number of records).
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Reply #6

serial_reset

France
5 Posts
Posted - 04/01/2025 :  12:00:52  Show Profile  Reply with Quote
Finally I took one day history for ACPM calculation which seams enough. Thanks.
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