Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Data Acquisition System Fundamentals Lab 1
Data Acquisition System Introduction I <ul><li>A data acquisition system consists of many components that are integrated t...
Data Acquisition System Introduction II <ul><li>Convert the signal into a digital format acceptable by a computer </li></u...
Data Acquisition System Block Diagram
Transducers <ul><li>Sense physical  phenomena </li></ul><ul><li>and translate it into electric </li></ul><ul><li>signals. ...
Signal Conditioning <ul><li>Electrical signals are conditioned so they can be  </li></ul><ul><li>used by an analog input b...
Analog to Digital (A/D) Converter <ul><li>Input signal </li></ul><ul><li>Sampling rate </li></ul><ul><li>Throughput </li><...
A/D Converter: Input Signal <ul><li>Analog </li></ul><ul><ul><li>Signal is continuous </li></ul></ul><ul><ul><li>Example: ...
A/D Converter: Sampling Rate <ul><li>Determines how often conversions take place. </li></ul><ul><li>The higher the samplin...
A/D Converter: Sampling Rate <ul><li>Aliasing </li></ul><ul><ul><li>Acquired signal gets distorted if sampling rate is too...
A/D Converter: Throughput <ul><li>Effective rate of each individual channel is inversely proportional to the number of cha...
A/D Converter: Range <ul><li>Minimum and maximum voltage levels that the A/D converter can quantize </li></ul><ul><ul><li>...
A/D Converter: Resolution
Data Acquisition Software <ul><li>It can be the most critical factor in obtaining reliable, high performance operation. </...
Programmable Software <ul><li>Involves the use of a programming language, such as: </li></ul><ul><ul><li>C++, Visual C++ <...
Data Acquisition Software <ul><li>Does not require programming. </li></ul><ul><li>Enables developers to design the custom ...
Designing a DAS: Factors to Consider  <ul><li>Is it a fixed or a mobile application? </li></ul><ul><li>Type of input/outpu...
Hands-On Lab <ul><li>Part 1: LabView </li></ul><ul><ul><li>Follow tutorial to implement a random number generator. </li></...
Upcoming SlideShare
Loading in …5
×

Lab 1 data acquisition fundamentals

2,729 views

Published on

data acquisition system

Published in: Education, Business, Technology
  • Be the first to comment

Lab 1 data acquisition fundamentals

  1. 1. Data Acquisition System Fundamentals Lab 1
  2. 2. Data Acquisition System Introduction I <ul><li>A data acquisition system consists of many components that are integrated to: </li></ul><ul><li>Sense physical variables (use of transducers) </li></ul><ul><li>Condition the electrical signal to make it readable by an A/D board </li></ul>
  3. 3. Data Acquisition System Introduction II <ul><li>Convert the signal into a digital format acceptable by a computer </li></ul><ul><li>Process, analyze, store, and display the acquired data with the help of software </li></ul>
  4. 4. Data Acquisition System Block Diagram
  5. 5. Transducers <ul><li>Sense physical phenomena </li></ul><ul><li>and translate it into electric </li></ul><ul><li>signals. </li></ul><ul><li>Examples: </li></ul><ul><li>Temperature </li></ul><ul><li>Pressure </li></ul><ul><li>Light </li></ul><ul><li>Force </li></ul><ul><li>Displacement </li></ul><ul><li>Level </li></ul><ul><li>Electric signals </li></ul><ul><li>ON/OFF switch </li></ul>
  6. 6. Signal Conditioning <ul><li>Electrical signals are conditioned so they can be </li></ul><ul><li>used by an analog input board. The following </li></ul><ul><li>features may be available: </li></ul><ul><ul><li>Amplification </li></ul></ul><ul><ul><li>Isolation </li></ul></ul><ul><ul><li>Filtering </li></ul></ul><ul><ul><li>Linearization </li></ul></ul>
  7. 7. Analog to Digital (A/D) Converter <ul><li>Input signal </li></ul><ul><li>Sampling rate </li></ul><ul><li>Throughput </li></ul><ul><li>Resolution </li></ul><ul><li>Range </li></ul><ul><li>Gain </li></ul>
  8. 8. A/D Converter: Input Signal <ul><li>Analog </li></ul><ul><ul><li>Signal is continuous </li></ul></ul><ul><ul><li>Example: strain gage. Most transducers produce analog signals </li></ul></ul><ul><li>Digital </li></ul><ul><ul><li>Signal is either ON or OFF </li></ul></ul><ul><ul><li>Example: light switch. </li></ul></ul>
  9. 9. A/D Converter: Sampling Rate <ul><li>Determines how often conversions take place. </li></ul><ul><li>The higher the sampling rate, the better. </li></ul>Analog Input 4 Samples/cycle 8 Samples/cycle 16 Samples/cycle
  10. 10. A/D Converter: Sampling Rate <ul><li>Aliasing </li></ul><ul><ul><li>Acquired signal gets distorted if sampling rate is too small. </li></ul></ul>
  11. 11. A/D Converter: Throughput <ul><li>Effective rate of each individual channel is inversely proportional to the number of channels sampled. </li></ul><ul><li>Example: </li></ul><ul><ul><li>100 KHz maximum. </li></ul></ul><ul><ul><li>16 channels. </li></ul></ul><ul><li>100 KHz/16 = 6.25 KHz per channel. </li></ul>
  12. 12. A/D Converter: Range <ul><li>Minimum and maximum voltage levels that the A/D converter can quantize </li></ul><ul><ul><li>Ranges are selectable (either hardware or software) to accurately measure the signal </li></ul></ul>
  13. 13. A/D Converter: Resolution
  14. 14. Data Acquisition Software <ul><li>It can be the most critical factor in obtaining reliable, high performance operation. </li></ul><ul><li>Transforms the PC and DAQ hardware into a complete DAQ, analysis, and display system. </li></ul><ul><li>Different alternatives: </li></ul><ul><ul><li>Programmable software. </li></ul></ul><ul><ul><li>Data acquisition software packages. </li></ul></ul>
  15. 15. Programmable Software <ul><li>Involves the use of a programming language, such as: </li></ul><ul><ul><li>C++, Visual C++ </li></ul></ul><ul><ul><li>BASIC, Visual Basic + Add-on tools (such as VisuaLab with VTX) </li></ul></ul><ul><ul><li>Fortran </li></ul></ul><ul><ul><li>C# </li></ul></ul><ul><li>Advantage: flexibility </li></ul><ul><li>Disadvantages: complexity and steep learning curve </li></ul>
  16. 16. Data Acquisition Software <ul><li>Does not require programming. </li></ul><ul><li>Enables developers to design the custom instrument best suited to their application. </li></ul><ul><li>Examples: TestPoint, SnapMaster, LabView, DADISP, DASYLAB, etc. </li></ul>
  17. 17. Designing a DAS: Factors to Consider <ul><li>Is it a fixed or a mobile application? </li></ul><ul><li>Type of input/output signal: digital or analog? </li></ul><ul><li>Frequency of input signal ? </li></ul><ul><li>Resolution, range, and gain? </li></ul><ul><li>Continuous operation? </li></ul><ul><li>Compatibility between hardware and software. Are the drivers available? </li></ul><ul><li>Overall price. </li></ul>
  18. 18. Hands-On Lab <ul><li>Part 1: LabView </li></ul><ul><ul><li>Follow tutorial to implement a random number generator. </li></ul></ul><ul><ul><li>Have TA check the results at end of both sections. </li></ul></ul><ul><li>Part 2: Virtual Oscilloscope </li></ul><ul><ul><li>Follow lab procedure to measure shutter speed and flash duration of a disposable camera. </li></ul></ul><ul><ul><li>Print graphs for use in lab report. </li></ul></ul>

×