| 摘要 |
FIELD: instrumentation engineering. SUBSTANCE: resistance across diagonally opposite terminals of strain-gage bridge power supply is measured at different temperatures, variation range of bridge output signal is determined for same temperatures with bridge fed from current supply, then temperature-stable resistor is cut in parallel with diagonally opposite terminals of bridge power supply and bridge initial output signal is measured, after that compensating resistor is cut in one of bridge arms; novelty is that resistance across diagonally opposite terminals of bridge power supply and output signal variation range are measured at three different temperatures corresponding to upper, intermediate, and lower points of operating temperature range; prior to cutting in temperature-stable resistor, temperature-dependent resistor is cut in series with diagonally opposite terminals, its temperature coefficient of resistance being the same polarity as that of resistance across opposite terminals of bridge power supply; temperature-stable resistor is connected in parallel with diagonally opposite power terminals with temperature-dependent resistor cut in series with it; desired values of temperature-stable and temperature-dependent resistors are found from equations given in description of invention. Then initial output signal of bridge is measured while the latter is fed from current supply for two temperatures corresponding to low and high values of operating temperature range; output signal variation range is determined at temperature corresponding to intermediate value of operating temperature range; compensating resistor value is measured using equation given in description of invention. EFFECT: improved accuracy due to sensitivity stabilization. 3 cl, 2 dwg |
