METHOD OF SETTING FOR STRAIN GAGE RESISTORS WITH BRIDGE MEASUREMENT CIRCUIT AS PER MULTIPLICATIVE TEMPERATURE ERROR WITH CONSIDERATION OF NON-LINEAR TEMPERATURE RESPONSE OF OUTPUT SENSOR SIGNAL

摘要

FIELD: electricity.;SUBSTANCE: method is related to rate determination of temperature-dependent resistor R_α and temperature independent resistor R_sh that shunts input resistance of bridge circuit. At that resistors R_α and R_sh are installed into output diagonal line of bridge circuit that operates at load resistance of R_r≤2 kOhm. Output resistance rate of bridge circuit R_out and its temperature coefficient of resistance α_r ⁺ and α_r ^- is determined for two temperature ranges Δt⁺=t⁺-t₀ and Δt^-=t-t₀, where t₀, t⁺, t^- is normal temperature and extreme points of operating temperature range of the sensor; output voltage values U⁺ _{out_t}, U^- _{out_t}, U_out are determined at load resistance of R_r500 kOhm for normal temperature and extreme points of operating temperature range of the sensor; temperature coefficient of frequency is determined for bridge circuit α_do ⁺, α_do ^- according to the formula: and non-linearity of bridge circuit temperature coefficient of frequency (Δα_do=α⁺ _do-α_do ^-) in temperature range from t⁺ up to t^-; location of α_r ⁺, α_do ⁺ and Δα_do is detected in the area of full compensation. If values of α_r ⁺, α_do ⁺ and Δα_do are within the specified range then rates of temperature-dependent resistor R_α and temperature independent resistor R_sh are determined by means of respective set of equations.;EFFECT: improvement of accuracy for setting of strain gage sensors.;6 dwg, 3 tbl