INDIRECT METHOD OF ADJUSTING STRAIN-GAGE METAL-FILM TRANSDUCERS, INCORPORATING BRIDGE MEASURING CIRCUIT, WITH RESPECT TO ADDITIVE TEMPERATURE ERROR Russian patent published in 2009 - IPC G01B7/16 

Abstract RU 2363928 C1

FIELD: measuring techniques.

SUBSTANCE: invention relates to measurements. Proposed method consists in the following. First, heat-dependant resistor Rβm is mounted. The bridge measuring circuit is re-equalised within ±0.5% of the rated output signal without varying temperature coefficient of resistance (TCR) of the branch being equalised, for example, by laser or electro-erosion adjustment of strain gage mounted in adjacent arm of the bridge circuit relative to Rβm location branch. Initial output signals from equalised pickup U and Uoβt are defined at normal temperature To and operating temperature, respectively. Rating of compensation temperature-dependant strain gage Rβ is calculated from the formula

where Ri is the rating of the branch resistor whereto temperature-dependant compensation resistor is connected. Obtained compensation resistor rating is entered into measuring circuit via partial use of temporary compensation temperature-dependant resistor with subsequent final equalisation without varying TCR by laser or electro-erosion adjustment of strain gage mounted in opposite arm of the bridge circuit.

EFFECT: easier and more accurate adjustment.

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RU 2 363 928 C1

Authors

Tikhonenkov Vladimir Andreevich

Stepanov Aleksej Konstantinovich

Dates

2009-08-10Published

2008-04-29Filed