Non-volatile Dose Memory (6150AD3/4/5/6 only)
The 6150AD3/4/5/6 provides a non-volatile memory for the dose measured with its internal tube
(henceforth called »internal dose«), whereas the 6150AD1/2 does not. The non-volatile memory keeps its
contents even when not powered, which means it will maintain the internal dose even while the
instrument is switched off. Data retention time is at least ten years.
The internal dose is transferred to the non-volatile memory when the instrument is switched off or when a
When starting to use the internal tube, that is after switching the instrument on, or after disconnecting an
external probe, the internal dose is read from the non-volatile memory. Henceforth we shall call this dose
value »pre-dose«, because it is a dose originating from a previous use. If the pre-dose is non-zero, it will
be displayed immediately. By pressing the corresponding key you now have to decide whether you want
to clear it or keep it as an initial value for the new job. Once you left this first automatic dose indication
(no matter how, by clearing or keeping the pre-dose), clearing the dose will no longer be possible for
All 6150AD models treat the »probe dose« (the dose measured with a probe) in the same way: the probe
dose is always zero when connecting the probe, it cannot be cleared during operation, and it will be lost
after disconnecting the probe.
Note: As mentioned above, the internal dose is transferred to non-volatile memory when you switch the
instrument off. If you do not switch the instrument off, but just remove the battery during operation, the
current internal dose will be lost. The memory will still contain the dose prior to the last use. This fact
may be useful in the following case: Assume that after a use the internal dose seems unreasonably high
(and the instrument has not yet been switched off), and you suspect this high value to originate from a
high pre-dose. To find out the pre-dose, do not switch off but remove the battery, insert the battery again,
and switch the instrument on. It will now indicate the pre-dose.
For applications where the non-volatile dose feature is not required, the need to clear the pre-dose every
time you switch the instrument on may be annoying. In this case the 6150AD3/4/5/6 may be programmed
in such a way that pre-dose will always be zero, just as with the 6150AD1/2 (see section 12.4).
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