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A universal fuel quantity indicator apparatus (100,102) includes a digital fuel quantity indicator (100) having an internal microprocessor control unit (104) and a removably connectable digital calibration trim unit interface (102) which enables the fuel quantity indicator (100) to be reconfigured f

A universal fuel quantity indicator apparatus (100,102) includes a digital fuel quantity indicator (100) having an internal microprocessor control unit (104) and a removably connectable digital calibration trim unit interface (102) which enables the fuel quantity indicator (100) to be reconfigured for different fuel tanks by varying selectable fuel tank parameters, such as constants associated with a fuel quantity determination based on calculations of capacitance of a tank capacitor array (110) and a compensator capacitor (112). The interface (102) includes up/down steering control buttons (140,142) which control selection and storage of the selected parameters, a mode selection jumper (154) which selects between a RUN mode and a CALIBRATE mode for the indicator (100), and an alternate static memory (108) which stores the configured parameters for loading to the indicator internal static memory (150) associated with the microprocessor (104) in the CALIBRATE mode to configure the indicator (100) for a specific fuel tank. The indicator display (130) is used in the CALIBRATE mode to display the parameters being selected to configure the indicator (100) for a specific fuel tank and in the RUN mode to display the measured fuel quantity information for the configured fuel tank. The control program for both the RUN and CALIBRATE modes is resident in the indicator internal static memory (150) and is accessed by the interface (102) in the CALIBRATE mode to accomplish the parameter selection needed to reconfigure the universal indicator (100) for a specific fuel tank, such as for an aircraft.

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In a fuel quantity indicator apparatus for determining the fuel quantity present in a fuel tank based on calculations of capacitance of a tank capacitor array and a compensation capacitor wherein a plurality of different parameters specific to a given tank configuration determine the measurement fac

In a fuel quantity indicator apparatus for determining the fuel quantity present in a fuel tank based on calculations of capacitance of a tank capacitor array and a compensation capacitor wherein a plurality of different parameters specific to a given tank configuration determine the measurement factors for said calculated fuel quantity determination, said indicator comprising display means for displaying fuel quantity information with respect to said fuel tank based on said calculated fuel quantity determination and microprocessor control means for calculating said fuel quantity determination and for controlling said display based thereon, said microprocessor control means comprising a CPU and first static memory means for storing control program information for controlling the operation of said microprocessor control means and for storing information corresponding to said different parameters for enabling said microprocessor control means to provide said calculated fuel quantity determination on said display means for a given specific fuel tank; the improvement comprising: second alterable static memory means operably connected to said microprocessor control means for providing an alterable auxiliary data source of different groups of said different parameters for a plurality of different specific fuel tanks to said microprocessor control means, and up/down steering control means operably connected to said microprocessor control means CPU and said first and second static memory means for selecting a particular group of said different parameters dependent on the parameters associated with a particular specific fuel tank, said up/down steering control means comprising switch means for variably selecting the value of each of said parameters in said particular group and for storing each of said selected parameters in said group in said second alterable static memory means, said switch means further comprising means for loading the selected parameter content of said second alterable static memory means into said microprocessor control means first static memory means for configuring said fuel quantity indicator for a particular specific fuel tank, said fuel quantity indicator apparatus being reconfigurable for a different specific fuel tank by varying said selected fuel tank parameters by said up/down storing control means; whereby a universal fuel quantity indicator apparatus is provided.