1. Internal tube of the 6150AD3/4/5/6,
2. Probe 6150AD-18,
3. Probe 6150AD-15,
4. Probe 6150AD-t,
5. Probe 6150AD-17,
6. Probe 6150AD-19,
7. Probe 6150AD-0, with the 6150AD5/6 also for probe 6150AD-b. Due to lack of space, the
6150AD5/6 has to use this last memory location for both probe types 6150AD-0 and 6150AD-b
concurrently. Therefore it is impossible to program different thresholds for those two probe types. If
you program the 6150AD-b dose rate alarm threshold to 1 µSv/h, then 6150AD-0 probes will have a
pulse rate threshold of 1 S
-1
. Correspondingly, a dose alarm threshold of 1 µSv converts to a pulse
count threshold of 1.
Programming functions that are not probe-specific can only be carried out if no probe was connected
when entering programming mode. Those functions are: programming the post-alarm increment, enabling
the non-volatile storage of the internal dose, and resetting the instrument to factory setting.
Also note that during programming mode the LCD illumination will not remain on for some time after
the illumination key is released; it will only be on while that key is depressed.
12.1 Individual Dose Rate Alarm Threshold
Entering programming mode first leads to the individual dose rate alarm threshold. The current value for
that threshold is displayed using the same format as during normal operation. The text »OFF« appears if
no such threshold is programmed. The text »ProG« flashes simultaneously to indicate that an individual
dose rate alarm threshold can now be programmed. The programming mode thus serves not only to
modify but also to view programmed data. If you do not wish to modify the threshold, press the function
key to move to the next programming function (see next section).
If you wish to modify the threshold, press the signal key. Now you get access to the digits of the threshold
that are all preset with zero. The digit to be modified flashes and can be set to a value from 0 to 9 by
repeatedly pressing the signal key. Pressing the function key selects the next digit.
The dose rate alarm threshold may be a large number with up to eight digits (9 999 999.9 µSv/h). The
LCD cannot represent such a large number. Therefore, the eight digits are divided into six window-type
parts with three digits each:
Window position (
xxx
):
Display:
Window 1:
xxx
xxxx,x
µSv/h
x,xx
Sv/h
Window 2:
x
xxx
xxx,x
µSv/h
xxx
mSv/h
Window 3:
xx
xxx
xx,x
µSv/h
xx,x
mSv/h
Window 4:
xxx
xxx
x,x
µSv/h
x,xx
mSv/h
Window 5:
xxxx
xxx
,x
µSv/h
xxx
µSv/h
Window 6:
xxxxx
xx,x
µSv/h
xx,x
µSv/h
You can only modify the current window, that is the three digits currently visible; all invisible digits are
zero. The last window (window 6) is available for all detectors. This means that you may set an alarm
threshold as low as 0.1 µSv/h for any detector. It is thus your responsibility to observe that the threshold
goes well with the beginning of the measuring range of the detector concerned. The first window,
however, is not necessarily window 1, but is the one corresponding to the end of the dose rate range of
the detector concerned. This automatically prevents setting a threshold exceeding the detector’s range.
03/2004
Operating Manual 6150AD
Page 39
Daimlerstrasse 27
Telefon +49(0)6203-9503-00 http://www.automess.de
USt.-ID-Nr. / VAT ID No.
D-68526 Ladenburg Telefax +49(0)6203-9503-29 eMail: [email protected] DE 144 458 420