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T O P I C    R E V I E W
Rybak1943 Posted - 04/16/2014 : 16:07:12
I need to reload Factory setting to my GMC-300E, which is available in:
Init Setup/Factory Reset
Can you please inform me how can I navigate to Init Setup?
5   L A T E S T    R E P L I E S    (Newest First)
EmfDev Posted - 06/11/2018 : 08:24:15
Thanks ullix :D
myf Posted - 06/11/2018 : 01:20:41
Hello Ullix,

Thank you very much for your so precise answer !

I install phonon on my laptop and now all is pretty...

sudo apt-get install python3-pyqt4.phonon

Now I'll test a gps logger and maybe will play with openradiation.


Have a nice day !

F. from France
ullix Posted - 06/10/2018 : 23:36:59
There is a simple factor between CPM and ÁSv/h:

Dose Rate [ÁSv/h] = CPM * 0.0065

An advanced Python Program GeigerLog is available here:

The GeigerLog manual explains the relationship of CPM and ÁSv/h in more detail.
myf Posted - 06/10/2018 : 09:30:36

I have a gmc-300E and I get CPM on laptop by USB link with a Python program. I don't know how to transform these CPM to ÁSv/h.

I can read both the ÁSv/h value and CPM value on the device display but I can only get CPM on the laptop.

Is it a linear formula ? Sv/h = k*CPM. what is k value ?
Is there a false time correction ? Sv/h = k* CPM / (1 - a*CPM)
Is there a temperature coefficient ?
What is the tube reference ?

Thank you a lot for your help !

Franšois (From France)

The program I write is this one, but you must indent inside the test if..else: and inside the while: loop.

import serial, time

ser = serial.Serial("/dev/ttyUSB0", 57600)
ser.write (("<<GETVER>>"+chr(0)).encode(encoding='utf-8'))
print ((str(ser.read_all ()))[2:-1])

while True :
ser.write (("<<GETCPM>>"+chr(0)).encode(encoding='utf-8'))
res = ser.read_all ()
if len (res) == 2 :
print (time.ctime() + " , " + str(res[0]*256+res[1]) + "CPM")
else :
print (time.ctime() + " , ERROR")
ZLM Posted - 04/18/2014 : 09:06:36
1. Press menu(S4) key to Main menu
2. Press arrow down(S3) key to scroll down to the Init Setup menu item.
3. Press enter (S4) key to enter this menu.
4. Select Factory reset and then press the enter(S4) key to start a factory reset confirmation.
5. Press any key will toggle the confirmation YES and NO. Select YES to confirm and wait for the popup message goes away to complete the factory reset.

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