Data Acquisition

Binary Ladder Circuits

Binary Ladder Circuits: A Binary Ladder Circuits is constructed of resistors having only two values and thus overcomes the disadvantages of weighted resistors. The left end of the ladder is terminated in 2 R, as shown in Fig. 17.14. Assuming that all digital inputs are at ground, beginning at point A of Fig. 17.14, the …

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Ladder Type Converter D/A

Ladder Type Converter D/A: Looking into any load from the left side we always see a resistor R. Similarly looking from the right side for any load, one always sees a resistor 2 R. This impedance phenomenon is the key to analyzing a Ladder Type Converter D/A, as shown in Fig. 17.12. When the switch …

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Variable Resistor Network

Variable Resistor Network: Variable Resistor Network – The basic problem in converting a digital signal into an equivalent analog signal is to change the n digital voltage levels into one equivalent analog voltage. This can be achieved most easily by designing a Variable Resistor Network which changes each of the digital levels into an equivalent binary …

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Multi Channel Data Acquisition System

Multi Channel Data Acquisition System: The Multi Channel Data Acquisition System can be time shared by two or more input sources. Depending on the desired properties of the multiplexed system, a number of techniques are employed for such time shared measurements. Multi-Channel Analog Multiplexed System: The multi-channel DAS has a single A/D converter preceded by …

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Single Channel Data Acquisition System

Single Channel Data Acquisition System: A Single Channel Data Acquisition System consists of a signal conditioner followed by an analog to digital (A/D) converter, performing repetitive conversions at a free running, internally determined rate. The outputs are in digital code words including over range indication, polarity information and a status output to indicate when the …

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Signal Conditioning of Inputs

Signal Conditioning of Inputs: Since all the data that have to be acquired, do not generally originate from identical sources, signal conditioning becomes necessary in some cases. A simple attenuator, is used to scale down the input gains, this is to match the input signal level to the converter’ full scale range. Linearisation of the …

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Data Acquisition System

Data Acquisition System: A typical Data Acquisition System consists of individual sensors with the necessary signal conditioning, data conversion, data processing, multiplexing, data handling and associated transmission, storage and display systems. In order to optimise the characteristics of the system in terms of performance, handling capacity and cost, the relevant sub systems can be combined …

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