With the 6150AD3/4/5/6, you can reset the dose to zero by pressing the on/off key twice within three
seconds. However, for safety reasons this is only possible for the internal non-volatile pre-dose that
the 6150AD3/4/5/6 displays after it has been switched on or after a probe has been disconnected.
In case of dose alarm you may acknowledge the dose alarm by pressing the signal key; this will
return to the ground state, dose rate indication. If there is no dose alarm, pressing the signal key will
have no effect.
5.7.6 Indication and Selection of Dose Alarm Threshold (6150AD3/4/5/6 only)
Only the 6150AD3/4/5/6 provides dose alarm thresholds. The threshold is displayed digitally with three
digits:
The loudspeaker symbol in the upper right corner shows that this indication concerns a threshold, not a
measured value. If no dose alarm threshold is selected (dose warning disabled), the digital display will
contain the text »OFF«.
The signal key allows to select a threshold from a list containing a set of fixed values and the user
programmable threshold. Please note that the instrument checks for dose alarm every time the
threshold is modified. If you move from a greater threshold to a smaller one, you may trigger dose
alarm.
With pulse probes, the threshold is a pulse count threshold. For your convenience, you may use a pulse
count threshold to signal the end of a measurement that requires a minimum pulse count. However, this
seems quite a special application. Therefore the instrument does not provide standard pulse count
thresholds. Such a threshold has to be programmed if required.
5.7.7 Indication of Battery Voltage
The voltage of the 9 volt battery is displayed digitally:
The range goes from 5.5 volt to approx. 10.0 volt. At voltages below 5.5 volt (which is also the limit for
battery warning) the digits »5.5« will flash.
With an external probe you will see the same image just with the probe type »ext xy« added. However,
this does not mean that the probe’s battery is concerned. It always concerns the 6150AD’s battery,
because probes are supplied from the 6150AD through the probe cable; probes do not have batteries at
all.
In this state the signal key has no function.
internal tube:
external probe, e.g. 6150AD-17:
ext
mSv
ba tt
v
Page 20
Operating Manual 6150AD
03/2004
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