ECOTEST TERRA-P MKS-05 Operating Manual page 35

To fix a new value of the threshold level, set all digits of the LCD by pressing the
MODE button, even if the values of the high-order digits are not changed.
Press shortly the MODE button after you have programmed the last digit. A
blinking sound symbol ")))" should appear on the digital LCD. Press shortly the
THRESHOLD button to switch off audio signaling of registered gamma quanta. The
sound symbol disappears at that. Press the THRESHOLD button once again to enable
audio signaling of registered gamma quanta; the sound symbol appears on the LCD.
Next short press of the MODE button fixes a new value of the threshold level and
the status of audio signaling system of registered gamma quanta.
Fourfold extinction of the LCD indicates that new settings have been fixed.
To check the value of the fixed DER threshold level, press the THRESHOLD
button and hold it pressed for not longer than two seconds after the threshold level
value appears.
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