non-volatile pre-dose that the 6150AD3/4/5/6 displays after it has been switched on or after a probe
Pressing the illumination key switches the LCD backlight on. After releasing that key, illumination will
remain on for 10 seconds and then go off. This avoids draining the battery in case you unintentionally
switched the illumination on and did not notice it because of bright ambient conditions.
Pressing that key while illumination is already on will extend illumination time, because the 10 seconds
of automatic illumination will start again after releasing the key. This also means that you cannot turn
illumination off; instead you have to wait until the 10 seconds are over.
Signal Key (Loudspeaker Key)
The signal key is assigned to alarms and audible signals. It serves to acknowledge alarms and also to
select alarm thresholds. Its function depends on the state the 6150AD is currently in. The next section
discusses these states including the local function of the signal key.
Functions called by the Function Key (Arrow Key)
The 6150AD provides the following functions also called the »states« the instrument can be in:
Indication of dose rate (this is the ground state after the instrument has been switched on, or after a
probe has been connected or disconnected),
Indication of dose rate mean value,
Indication and selection of dose rate alarm threshold,
Indication of dose rate maximum value,
Indication and selection of dose alarm threshold (with 6150AD3/4/5/6 only),
Indication of battery voltage,
Indication of calibration parameters (instruments equipped with hardware release 3 additionally
allow for indication of the program version by pressing the signal key).
The function key allows to call these states one after the other, where the last state (calibration
parameters) returns to the ground state (dose rate). From any state, keeping the function key depressed for
three seconds will always return to the ground state.
As already mentioned earlier, the 6150AD3/4/5/6 automatically switches to the corresponding state if an
alarm occurs: on dose rate alarm it switches to dose rate indication, and on dose alarm it switches to dose
indication. Thereby it forces the user to notice the alarm. Thereafter you may again select some other
The 6150AD1/2 does not provide dose warning, and on dose rate alarm it will not switch to dose rate
indication. You have to put the 6150AD1/2 into the dose rate indication state manually if you want to use
as a unit (pulses per second). Everything that was mentioned and that will be
mentioned also applies to this category of probes, if you replace »dose rate« with »pulse rate« and »dose«
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