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HP 8591A ....FREQ UNCAL message

Question asked by FM on Feb 28, 2008
Latest reply on Mar 18, 2008 by FM
I have this spectrum since 1992 but the batterie was installed in 1990.  This is 18 years and I don't think the internal batterie had been change.  It is mark on the back of the instrument that the batterie will last 8 years at room temperature.  In the case of the batterie had failed, could that cause me the FREQ UNCAL problem because it can't hold anymore the calibration coefficients?