| 摘要 |
FIELD: measurement equipment.SUBSTANCE: invention relates to measurement equipment. Essence of the invention is as follows: temperature-dependent technological resistor R, the nominal value of which is higher than possible values of compensation temperature-dependent resistor R, is installed into an output diagonal of the bridge circuit. A bridge is installed parallel to resistor R. Output resistance of bridge circuit Ris measured. The sensor is connected to low-resistance load R=2·R. Initial imbalance and an output signal of the sensor is measured at normal temperature t, as well as at temperature tcorresponding to an upper limit of the working temperature range, and tcorresponding to a lower limit of the working temperature range. Measurements are repeated after the sensor is connected to low-resistance loadBased on the measured values of the initial imbalance and the output signal of the sensor there calculated is temperature coefficient of frequency (TCF) of the bridge circuitandand TCF of output resistance at temperatures tand trespectively, as well as non-linearity of TCF of the bridge circuit (). The bridge is removed from resistor R. The initial imbalance and the output signal of the sensor is measured at temperatures t, tand t. Based on the measured values of the initial imbalance and the output signal of the sensor, TCF of temperature-dependent resistor Ris calculated at temperatures tand t. If TCF of the bridge circuit and its non-linearity belong to the application field of the method, then, the nominal value of temperature-dependent resistor Rand temperature-nondependent resistor Ris calculated. Process temperature-dependent resistor Ris replaced with resistor Rby partial activation of resistor R. Resistor Ris shunted with temperature-nondependent resistor R.EFFECT: higher compensation accuracy.2 cl |
