The Q-100, Q400, or Q-500 dosimeter displays DFx or DEFAULT x on the power up instead of the normal Inl or INITALIZING; Why?
Depending on the default number, x, this is an indication that peak calibration constants have been lost, the serial number has been lost, and/or the setup information has been lost. The most likely cause for this is that the lithium battery inside the meter is dead. That lithium battery backs-up the above information when the 9Volt battery is removed. To correct the default condition the lithium battery should be replaced. Then the lost information must be restored. The end user cannot replace the lithium battery this is done by our service technicians.
