Patent ID: 7304484

Claim:
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 ( Δ ⁢ ⁢ R R ) span ⁢ ⁢ ⁢ compensated = ( t 1 ′ t 2 ′ - t 3 ′ t 4 ′ - TkO ) ⁢ 1 1 + TkS ⁢ 2 · t k t 1 ′ + t 2 ′ 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.