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Analogue Signal Processing

Analogue Signal Processing
Analogue signal processing Problems The real environment can be measured in many different forms, for example in terms of temperature, humidity or air pressure. The values of these physical variables change constantly. Elements which monitor the statuses and status changes of a given environment and supply an indication of this changedenvironment must be able to portray the continuous change. In industrial monitoring tasks, sensors are responsible for registering ambient statuses. Sensors provide signals which allow detailed conclusions for downstream evaluation and monitoring systems with detailed conclusions about the statuses or status changes, for example in a production process. Sensor signals monitor continuous changes inthe monitored field. They occur in digital and analogue form. As a rule, they supply an electrical voltage or current value which corresponds proportionally to the physical variables being monitored. If automation processes are expected to reach certain statuses or keep them Constant, then analogue signal processing is required. It is also important in areas where this is has already been part oflong established practice, for example process engineering or the chemicals industry. In process engineering, standardised electrical signals are normally used. Currents from 0… 20 mA, 4… 20 mA or voltages from 0..10 V have become established as the output variable for sensors of various different physical parameters. Weidmüller takes account of the continuing trend to automate – including and inparticular with analogue signal processing – and offers a wide range of products tailor-made to the requirements involved in handling sensor signals. Units for the common signals (0..20 mA, 4..20 mA, 0..10 V) generate an output signal as proportional values of the variable input signal. “Protective separation” e.g. of the sensor circuit from the evaluation circuit is also taken into account.“Protective separation” prevents mutual interference of several sensor circuits, for example as in the case of earth ground circuits in linked measuring circuits. The wide range of products completely covers the functions involved in signal conversion, signal separation and signal monitoring. The products thus satisfy nearly all applications in industrial measuring technology, and safeguard elementaryfunctions between field signals and further processing systems. The mechanical properties of the products are built up around a continuous concept. Signal converters can be used with other Weidmüller products and combined with each other. They are designed from an electrical and mechanical point of view so as to entail a minimum wiring workload and maintenance.

The product programme contains thefollowing functions: • dc/dc converters • Current converters • Voltage converters • Temperature transformers for resistance thermometers and thermoelements • Frequency converters • Potentiometer transducers • ac transducers • Bridge transducers (strain gauges) • Threshold monitoring modules • AD/DA converters The stated products are available as pure signal conversion, 2-way isolation, 3-wayisolation and passive disconnectors – depending on the production functions in each case.

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Analogue Signal Processing
Weidmüller interface units 2-way isolation separates the signals and decouples the measuring circuits. Potential differences, caused by long line leads and joint referencepoints, are eliminated. Signal isolation also protects from destruction by overvoltage together with inductive and capacitive gaps.

3-way isolation also separates the supply voltage to the input and output circuit and allows for operation with only one operating voltage.

Passive isolators have another crucial advantage: they do not need any additional power supply. The power supply for...