![]() ![]() The reference potential of the A/D converter is ≈ U/2, since the positive input of integrator 402 is connected to a bridge output via resistor 506. All digital functions of the A/D converter are implemented via software in a microcomputer. ![]() It functions according to the principle of signaldependent pulse-width modulation. The A/C converter directly processes the small output signal of the strain gauge sensor. In order to ensure a higher signal yield for the seca 717, the measuring element and the A/D converter are supplied with 10V usually, a 5V power supply is provided. This causes the resistance to be increased or reduced so that the bridge is detuned, causing a change in the output signal: When a load is applied, the spring body is deformed in such a way that the two resistors forming a half bridge are extended and compressed. 4 wire resistance strain gauges are attached to its surface at suitable points which are connected in a bridge circuit. A platform load cell is used as the force measuring element. ![]()
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