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Chapter 9 Data Acquisition Measurement or generation of physical signals.

Chapter 9 Data Acquisition Measurement or generation of physical signals. Data Acquisition in LabVIEW. NI-DAQmx Next generation driver: VIs for performing a task One set of VIs for all measurement types. Traditional NI-DAQ Specific VIs for performing: Analog Input

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Chapter 9 Data Acquisition Measurement or generation of physical signals.

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  1. Chapter 9Data AcquisitionMeasurement or generation of physical signals.

  2. Data Acquisition in LabVIEW • NI-DAQmx • Next generation driver: • VIs for performing a task • One set of VIs for all measurement types • Traditional NI-DAQ • Specific VIs for performing: • Analog Input • Analog Output • Digital I/O • Counter operations

  3. DAQ System Components> Sensor/Transducer> Signal Conditioning Unit> DAQ PCI Interface Card> Computer> Software Analyze & Display

  4. Phenomena & TransducersTemperature Thermocouple Resistance Temperature Detectors (RTDs) Integrated Circuit SensorLight Vacuum Tube Photosensor Photoconductive CellsSound MicrophoneForce & Pressure Strain Gauges Piezoelectric Transducer Load CellsPosition Optical Encoder PotentiometersFluid Flow Head Meters Rotational FlowmeterspH pH electrodes

  5. Signal Conditioning Circuits > Linearization > Excitation > Isolation > Filtering > Amplification

  6. Sensors DAQ Device Computer Cable Terminal Block Data Acquisition M-SERIES • Data Acquisition (DAQ) Basics • Connecting Signals • Simple DAQ Application

  7. NI USB-6009 14-bit Analog Inputs

  8. Signal Types Digital: > On-Off > Pulse Train Analog: > DC > Time-Domain > Frequency-Domain

  9. Signal Information > State > Rate > Level > Shape > Frequency

  10. Signal Source Configuration > Referenced Singled-Ended RSE > Non-referenced Singled-Ended NRSE > Differential

  11. Analog I/O Conversion Issues > Resolution > Range > Sampling Rate

  12. ADC Resolution> Number of bits used to represent an analog signal.

  13. RangeMinimum & Maximum analog signal levels that the ADC can handle.

  14. Code WidthVCW = Range G x 2ResolutionThe smallest detectable voltage change by a data acquisition board with gain G.

  15. Sampling Rate Samples of an analog signal Discrete points in time Sampling frequency – number of samples per second

  16. Sampling Rate Aliased Signal Adequately Sampled Signal

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