ECOTEST MKS-05 TERRA Operating Manual page 33

The value of the preset threshold level is fixed after all digits are programmed by short
pressing of the MODE button. To fix a new value of the threshold level, set all digits on the
LCD by pressing the MODE button, even if the values of the high-order digits are not
changed. Double extinction of the LCD will indicate that the programmed level is fixed.
Press and hold the THRESHOLD button to check the value of the fixed DE threshold
level. The threshold level value will appear on the LCD in two seconds. When the
THRESHOLD button is pressed for more than four seconds, the low-order digit starts
blinking, indicating that a new threshold level value can be programmed. A two-tone audio
signal indicates that the programmed DE threshold level has been exceeded.
Note. A zero value of the threshold level is set automatically when the dosimeter is
switched on indicating that the DE threshold alarm system is off.
2.3.3.6 Surface beta-particles flux density measurement
This mode follows the mode of photon-ionizing radiation DE measurement. It is indicated
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