FIELD: measuring.
SUBSTANCE: invention relates to measurement equipment and can be used in passive compensation of zero shift of a pressure sensor with a bridge measuring circuit based on an additive temperature error, without affecting the sensitive element of the sensor. Disclosed is a method for passive temperature compensation of zero shift of a pressure sensor, which includes determination of at least two values of change in zero shift voltage ΔU of the pressure sensor, determined by the difference between zero shift voltages at normal temperature and at operating temperature, determination of bridge arms for installation of thermally independent compensation resistors, which are substituted into the bridge circuit of the pressure sensor simultaneously in pairs selected from the group: Rcomp1 and Rcomp3, Rcomp1 and Rcomp4, Rcomp2 and Rcomp3, Rcomp2 and Rcomp4. At that, substitution of thermally independent compensation resistors Rcomp1 and Rcomp2 is carried out in parallel to resistors R1 and R2 of the bridge of the pressure sensor, respectively, and substitution of thermally independent compensation resistors Rcomp3 and Rcomp4 is carried out in series with resistors R3 and R4 of the bridge of the pressure sensor, respectively, after which the selected pair of thermally independent compensation resistors is mounted on the compensation board, which in turn is electrically connected to the bridge circuit of the pressure sensor. Value of the thermally independent compensation resistor Rcomp1 or Rcomp2 is selected from the condition that it is not less than 1.7⋅102 times greater than the value of resistor R1 or R2 at normal temperature of the bridge of the pressure sensor, respectively, and the value of the thermally independent compensation resistor Rcomp3 or Rcomp4 is selected from the condition that it is not less than 2.2⋅105 times less than Rcomp1 or Rcomp2, respectively.
EFFECT: improved manufacturability of the method of passive temperature compensation of pressure sensor zero shift, which is simpler in implementation and accurate at the output.
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