ELECTRONIC WEIGHING MACHINE Russian patent published in 1995 - IPC

FIELD: mass measuring technique. SUBSTANCE: weighing machine includes a cargo receiving platform, acting through a loading device upon a strain gage pickup, whose first and second inputs are connected with first and second outputs of sine signal generator. A measuring diagonal of strain gage pickup bridge circuit is connected through a measuring transformer with inputs of a measuring amplifier, whose output is joined with a first input of a phase detector. A second input of the phase detector is connected with a third output of the sine signal generator. The machine also has connected in series a follower, a voltage divider, a high frequency filter, a differential amplifier, an integrator and an analog-to-digital converter, whose output is connected through input-output ports with inputs and outputs of a microcomputer. An output of the phase detector is joined with an input of the follower and with the second input of the differential amplifier. EFFECT: enhanced accuracy of weighing machine. 1 cl, 4 dwg