FIELD: measurement equipment.
SUBSTANCE: determine a temperature sensitivity coefficient (TSC) of a bridge circuit α+ do and α- do at temperature t+ and t-, corresponding to upper and lower limit of the working temperature range, non-linearity of bridge circuit TSC (Δαdo=α+ do-α- do). If the produced value Δαdo is positive, they convert the positive non-linearity of bridge circuit TSC into the negative one by inclusion of an heat-independent resistor Ri. For this purpose they determine input resistance and TSC of input resistance, and the input value of TSC value, and the input resistance, TSC of resistance strain gauges α+ d and α- d at temperature t+ and t-, calculate non-linearity of bridge circuit TSC (Δαd=α+ d-α- d). If α+ d and Δα- d are in the field of conversion of positive non-linearity of bridge circuit TSC into the negative, then they calculate the nominal value of the resistor Ri. They connect the resistor Ri into the diagonal of the bridge circuit power supply. The TCS of the bridge circuit is defined at the temperature t+ and t-, non-linearity of the bridge circuit TCS is calculated as Δαdo. If Δαdo takes the negative value, then compensation of multiplicative temperature error is carried out with account of negative non-linearity of bridge circuit TSC by inclusion of a heat independent resistor Rαoutp, shunted with a heat independent resistor Rdoutp, into the output diagonal of the bridge circuit under the resistance of the load RL≤2 kOm.
EFFECT: higher accuracy of compensation.
3 tbl, 3 dwg
