A 9 volt battery serves as power supply. The instrument measures battery voltage when it is switched on
and from then on at five-minute intervals. You may look at the battery voltage at any time with the help
of the function key. When battery life is coming to an end, the instrument issues battery warning in both
audible and visible form. After the first occurrence of the battery warning still approx. 70 operating hours
will remain (with an alkaline battery, without illumination).
Due to low power consumption, an alkaline battery will last for approx. 1000 operating hours (approx.
3000 hours with instruments equipped with hardware release 3). With the illumination on, battery life
considerably drops to approx. 60 hours. Although alkaline batteries are recommended, zinc carbon
batteries will also do. You may also use accumulators (rechargeable batteries). However, the voltage of
accumulators gives only poor information about their capacity, therefore battery warning will be much
The microprocessor calculates dose rate from the tube’s pulses in a purely digital way. Calibration
parameters are not stored as analog quantities like settings of variable resistors, but as digital numbers,
making them totally insensitive to drifts in time. These features ensure high measuring accuracy, also in
the long term. Calibration is done at two dose rates, therefore the instrument has two calibration
parameters. One parameter compensates the spread of sensitivity of the tubes, the other compensates dead
time loss. The calibration parameters may be viewed for service purposes, but modifying them is only
possible by adjusting two switches after opening the instrument.
Connecting a probe automatically turns off the internal counting tube and puts the probe’s detector in
operation. The 6150AD automatically identifies the probe type and displays it in the upper left corner of
the LCD. It automatically selects ranges and units for that probe type, including the unit pulses per
second for the pulse probes. Just like with the pulses from the internal tube, the pulses originating from
the probe are processed in a purely digital way. The microprocessor reads the probe’s digital calibration
parameters through the probe cable. Therefore you do not have to assign a certain probe to a certain
6150AD. You may operate any probe with any 6150AD without having to fear that the probe’s indication
might depend on the 6150AD used as a meter.
There are some intentional restrictions as to which probe models work with which 6150AD models, see
the table »Compatibility with Probes« at the end of section 2.
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