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Signal Conditioning (Multiplexer, Data Acquisition,DSP, Pulse Modulation)

PE-4030 Chapter 3 Part two. Signal Conditioning (Multiplexer, Data Acquisition,DSP, Pulse Modulation). Professor Charlton S. Inao Professor Mechatronics System Design Defence Engineering College Bishoftu, Ethiopia. Instructional Objectives.

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Signal Conditioning (Multiplexer, Data Acquisition,DSP, Pulse Modulation)

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  1. PE-4030 Chapter 3 Part two SignalConditioning(Multiplexer, Data Acquisition,DSP, Pulse Modulation) Professor Charlton S. Inao Professor Mechatronics System Design Defence Engineering College Bishoftu, Ethiopia

  2. Instructional Objectives In this lesson, the students shall be able to understand the principle of Signal Conditioning focusing mainly on the following topics: 1. Multiplexers 2. Data Acquisition 3. Digital Signal Processing 4. Pulse Modulation

  3. Multiplexing • Multiplexing is the process of handling multiple measurement inputs from the analog sensors or a number of different measurements from different locations in quick succession over a period of time before sampling and holding process, and eventually to analog to digital conversion(ADC).

  4. Sample and Hold

  5. Multiplexing with AA Filter

  6. 1) Multiplexers • Frequently there is a need for measurements to be sampled from a number of different locations, or perhaps a number of different measurements need to be made. • Rather than use a separate microprocessor for each measurement , a multiplexer can be used. • The multiplexer is essentially a switching device which enables each of the inputs to be sampled in turn. Analog Inputs Sequence of digital Signals

  7. Multiplexers • A multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. •  A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output. •  Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth.

  8. Multiplexer as a Controlled Switch Schematic of a 2-to-1 Multiplexer. It can be equated to a controlled switch.

  9. Mux - DeMux The basic function of a multiplexer: combining multiple inputs into a single data stream. On the receiving side, a demultiplexer splits the single data stream into the original multiple signals.

  10. Types of Multiplexers A 2-to-1 mux

  11. 2) Data Acquisition 2.1 Methodology 1.1 Source 1.2 Signals 2 .2DAQ hardware 2.3 DAQ software

  12. Data Acquisition System

  13. 2) Data Acquisition • Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. • Data acquisition systems (abbreviated with the acronym DAS or DAQ) typically convert analog waveforms into digital values for processing.

  14. The components of data acquisition systems include: • Sensors that convert physical parameters to electrical signals. • Signal conditioning circuitry to convert sensor signals into a form that can be converted to digital values. • Analog-to-digital converters, which convert conditioned sensor signals to digital values. • .

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