METHOD FOR TUNING OF INTEGRAL STRAIN-MEASURING BRIDGE USING POWER SUPPLY Russian patent published in 1997 - IPC

FIELD: instruments. SUBSTANCE: method involves measuring of resistance of power supply diagonal of strain-measuring bridge for different temperature values, measuring of variation range of output signal of strain-measuring bridge for same temperature values when strain-measuring bridge is fed by power supply, connection of temperature-stable resistor in parallel to power supply diagonal of strain-measuring bridge, measuring initial output signal from strain-measuring bridge and additional of compensating resistor in one are of bridge. Resistance of power supply diagonal of strain-measuring bridge is measured for three different temperature values which correspond to lower, middle and upper points of temperature variation range. Before connection of temperature-stable resistor, additional resistor which resistance depends on temperature in same way as that of power supply diagonal is connected in series to power supply diagonal of strain-measuring bridge. Said temperature-stable resistor is being connected in parallel to power supply diagonal and temperature-sensitive resistor. Then initial output signal from strain-measuring bridge is measured when bridge is fed by power supply for two temperature values which correspond to lower and upper limits of temperature variation range. Then variation range of output signal for temperature which corresponds to middle points of temperature variation range is measured. Value of resistance of compensating resistor is calculated. Said compensating resistor is made from material which temperature sensitivity coefficient is by two orders of magnitude greater than temperature sensitivity coefficient of strain-measuring resistors. EFFECT: increased precision. 2 dwg