4.3.3.3 Measurement of DER
After dLCD self-testing is finished, the dosimeter enters the mode of
DER measurement. This mode can be entered from any other operating mode
by shortly pressing the MODE button. The units of measurement are
expressed in µSv/h.
The process of DER measurement accumulation and averaging will start
after the dosimeter is switched on. The process will continue up to 1600 s at
DER values close to background. The data on the dLCD will be updated each
10 s. However, wait 2-3 minutes to get more reliable result. As the radiation
intensity increases, the time of DER measurement averaging and the time of
data updating on the dLCD falls to the minimum of 2 s.
The units of measurement are expressed in µSv/h, mSv/h, and Sv/h.
The statistical error of the displayed measurement result of DER is
indicated by the blinking or steady decimal point.
The blinking point indicates that the statistical error of the indicated
DER measurement result exceeds the maximum permissible error.
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