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2. Oper ation
Su rv e y Met e r Mod es
To set the Desktop Geiger Counter in Survey Meter mode, ensure that the Random
Number Generator Switch is in the center position (RNG Off).
CPS Mode:
Set the Conversion switch to mR/hr (milliroentgen/hour). The time function switch to
"CPS", Backlight switch on and the audio switch on. Turn on the Geiger counter. If you have a radioactive
source bring the source close to the GM tube. For Geiger counters with an external wand, bring the wand
close to the radioactive source.
Every radioactive particle detected will cause the Geiger counter to click and the LED to blink.
The LCD digital display in this mode updates the count and radiation level every second, see photo above.
The display always shows the previous seconds count and radiation level. The count "Count/Sec" is the
number of radioactive particles detected in the previous second. On the second line the equivalent radiation
level of that count in mR/hr. You can change the Conversion switch to mSv/hr to read the radiation level in
milli-sieverts/hour.
CPM mode
The
displays the counts per minute and convert the radiation level into micro-Roentgens
(uR/hr) or micro-Sieverts (uSv/hr). The CPM modes is useful for checking background radiation. First set
the switch to Metric or Imperial measurement. Next set the time function switch to CPM. The LCD display
changes. The left side of the first line begins a count up to 60 seconds, increasing by 1 each second. The
right hand side of the first line displays the number of radioactive particles detected.
DTG-01
7
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