Patent ID: 7304484
Filing Date: 2007-12-04
Classification: G01L,G01R

Abstract:
1. A method for the temperature compensation of a resistance measuring bridge, the method comprising: providing an input circuit and a resistance measuring bridge having at least one resistor and a resistance switching circuit; positioning a capacitor in parallel with the input circuit and the resistance switching circuit; and placing a compensating resistor in series with the at least one resistor, the at least one resistor and the compensating resistor successively discharging the capacitor; compensating the temperature-dependent span error in the output signal of the resistance measuring bridge according to in which t′ 1 , t′ 2 , t′ 3 , t′ 4 are the discharge times of the capacitor across at least one of the resistors of the resistance measuring bridge, TkO the offset error of the non-unbalanced, unloaded measuring bridge, TkS a correction factor for the span error of the resistance measuring bridge and t k the discharge time component of a compensating resistor (R k ) located in the input circuit of the resistance measuring bridge.