Abstract: An apparatus increases the accuracy of a signal delivered from a remote analog sensor to an analog to digital converter. The output of the sensor is derived from a ratio between the power applied and the sensed parameter; thus, any changes to the power applied affects the accuracy of the sensor output. It is, therefore, advantageous to closely control the voltage applied to the sensor. The apparatus monitors the voltage drop across the lead lines which extend between the sensor and a power supply and increases the voltage applied to the sensor by a magnitude corresponding to the lead line voltage drop. The accuracy of the sensor is preserved independent of the lead line length and resistance.