MULTICHANNEL MEASURING CONVERTER AT THE CARRIER FREQUENCY WITH BUILT-IN DIGITAL SYNCHRONOUS DETECTOR Russian patent published in 2017 - IPC G01L1/22 G01B7/16 

FIELD: measuring equipment.

SUBSTANCE: equipment can be used in any industry fields, requiring precision (0.002% and more precise) measurements of mass, force, torque, etc. The multichannel signal measuring converter in the strain gauge bridges circuits contains the generator block of the sinusoidal signals, blocks of meters according to the number of channels. The counterphase power signals of the strain gauge bridge circuit from the sinusoidal signal generator unit output through the power amplifiers are fed to the power inputs of each strain gauge bridge circuit, in each meter block the voltage from the power inputs of the strain gauge bridge circuit through the additional buffer amplifier is fed to the inputs of the supporting inductive voltage divider, the output of which is connected to the first switching unit input, the second input of which is connected to the output diagonal of the strain gauge bridge circuit, and the output through the differential operational amplifier is connected to the input of the analog-to-digital converter (ADC), which operating mode is determined by the first microprocessor. The ADC input-output is connected to the input / output of the first microprocessor, the output of which is connected to the input of the second microprocessor (MP2), performing the digital synchronous detection, the digital filtering and calculating of the strain gauge bridge circuit division coefficient; the input / output of the second microprocessor is connected to the input-output of the data transfer device, the analog input of the MP2 is connected to the protection circuit output, the inputs of which are connected to the power amplifiers outputs, the second output of the MP2 is connected to the third input of the protection circuit, and the third output of the MP2 is connected with the third switching unit input. The ADC clocking input of each meters block is connected to the sinusoidal signals generator unit output, forming the clocking impulses, and the discrete input of the first microprocessor of each meter block is connected to the sinusoidal signals generator unit output, forming the signal of the power voltage full phase of the strain gauge bridge circuits.

EFFECT: reduction of the main and additional measurement errors.

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