ECOTEST SPECTRA MKS-11GN Operating Manual page 23

"Key tone", audible and/or vibration signals generated when
there was some manipulation with the device's controls. These
signals can be completely disabled.
2.3.3 Operation procedure of the device
The general control algorithm of the device's operation is as
described below.
As soon as switched on, the device enters the mode of DER
measurement and indication by gamma and neutron channels, and
starts calibration by gamma background level and testing gamma
radiation detector efficiency. The duration of calibration is from 60
to 2 s, depending on the gamma background DER.
The
"background" inside it indicates that the calibration is completed.
Note 1. Calibration by the level of gamma background is done
automatically when switching the device on, exiting the
identification mode, or as required by the user. Calculation of the
search sigma threshold level of the alarm is performed regardless of
the operating mode of the device.
Note 2. For manual recalibration, press and hold "OK" in the
joystick for at least 2 seconds while still being in DER measurement
mode. The
"background" will start flashing
The device has the mode of sound alarm of registered gamma
quanta or neutrons, which turns on and off only in the mode of
intensity histogram display by gamma and neutron channels. To
enable/disable this mode, press and hold "OK" in the joystick for at
least 2 seconds. In the joystick, briefly press "OK" for recalibration
in terms of the intensity of sounding.
icon that is totally green with no flashing
icon will start filling once again, and
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