COMPENSATION CIRCUIT OF TRANSIENT TEMPERATURE CHARACTERISTIC IN STRAIN GAUGE TYPE CONVERTER AND ITS COMPENSATION METHOD

摘要

PURPOSE: To accurately compensate any transient temperature characteristic attending upon a thermal shock even if the thermal shock is frequently impressed on the sensitive part or strain start part of a converter in addition to a physical quantity to be measured. ;CONSTITUTION: Four strain guages R_g1 to R_g4 and a transient temperature characteristic compensation resistor r_s1 are all installed at the nonpressure surface side of a diaphragm 10a. A balance resistor r_s2 and a zero temperature characteristic compensation resistor r_t are installed on a base plate 20. In a bridge circuit formed from these strain guages R_g1 to R_g4, such an output at presenting a large transient temperature characteristic appears whenever a thermal shock is added to the diaphragm 10a, therefore the transient temperature characteristic compensation resistor r_s1 negating this output is inserted into one side of the bridge circuit, and likewise the balance resistor r_s2 with the same resistance value as the transient temperature characteristic compensation resistor r_s1 is inserted into the other side adjacent to this bridge circuit. Moreover, in order to compensate a drift to a slow temperature change in a converter, the zero temperature characteristic compensation resistor r_t is inserted into one side of the bridge circuit.;COPYRIGHT: (C)1996,JPO