| 摘要 |
In a measuring device comprising an oscillator-fed sensor for a non-electrical variable and a circuit arrangement mounted downstream of the sensor for rectifying the output voltage of the sensor, interfering pulses that interfere with the output voltage of the distance sensor and that are rectified together with the output voltage of the distance sensor during rectification, falsify the result of measurement. This is especially so for needle-shaped interfering pulses that have a large amplitude. The aim of the invention is therefore to reduce the aforementioned falsifications of the results of measurements. For this purpose, the output voltage of the sensor is fed to a ramp circuit arrangement wherein the sign of the transmission behavior can be controlled. The sign of the transmission behavior of the ramp circuit arrangement is controlled by a switch signal whose edges correspond to the zero crossings of the output voltage of the sensor. Circuit arrangements of the aforementioned kind can be advantageously used in measuring devices for non-electrical variables with sensors that are fed by an alternating current, for example position transducers with sensors that convert the position of a mobile component to an electric output signal, especially in the form of an electric direct voltage. The mobile component can be the control piston of a pneumatic or hydraulic valve. |
