operational amplifier ilab

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A presentation on the development of the Operational Amplifier iLab at the 5th Annual iLab and National Instrument Conference held on 4-5 July 2011 at Makerere University, Uganda


  • 1. Fifth Annual iLab and NationalInstrument ConferenceTheme:Online Laboratories: An Icon Educational Technology for a Richer Pedagogical ExperienceJuly, 2011Ishola Babatunde I. Obafemi Awolowo University, Nigeria

2. Operational Amplifier iLab To inspect the properties of various configurationof an operational amplifier Used in EEE310 (Operational Amplifiers andActive Networks) Batched Architecture 3. Previous version(s) The greater the expectation,the better performance(Pygmalion effect)-makebelieve Inability to relate iLabexperience to real worldapplication 4. Lab Client Lab Client developed withAdobe Flex Framework (Flex 3) Realistic Interface, RicherPedagogical Experience, flexibleand intuitive 5. Verify ButtonLab Client (cont.) Help Button Quick reference Teaches use of datasheet,colour coding, breadboard,oscilloscope etc. Depth First Search to verifyconnections on the circuitDisplays currentstatus of the lab 6. Connecting Rf (node 11) to Vout (node 16)DFS employed to search the connection treedetermines if node 11 is ultimately connected to node 16Rf (node 11) Vout (node 16) 7. Lab Client (Oscilloscope Interface) few buttons enabled for now Zoomed outZoomed In 8. Lab ServerSwitch Matrix SUT on NI ELVIS I 9. Reconfigurable OpAmp circuit Experiment S1S2S3S4S5S6S7S8S9S10 Invertingopenclose openclose openclose openclose openopen Non-Invertingopenclose openclose openclose close OpenOpenopen Unity Gain close openOpenOpenclose OpenOpenOpenOpenOpen Differentiator OpenOpenclose close openClose Openclose Close close 10. Web service (Microsoft.NET) allows the switches in the array to be remotely configuredimplements 4 circuits on a single board NI SCXI 1169 100- channel SPST switch arrayNI TBX DB-50Reconfigurable LFH200OpAmp CircuitCable NI SCI 1000 Chassis 11. Custom-built LabVIEW program function generator and Oscilloscope interacts with the NI ELVIS on which the SUT is mounted for data acquisition and signal processing 12. LabVIEW Interface launched by the LabVIEW dll during experiment execution waveform digitized to extract the array of points representing the signal C# inserts the arrays (channel A/Gen signals) into the lab server database to be reconstructed by the client 13. Finishing touches Function Generator interface More controls to be enabled 3D/isometric view of client interface More experiments coming: Integrator Summer Instrumentation Amplifier 14. Bandwidth Issues File Size 1.6MbiLabs Multi-tiered topology makes them suitable forbandwidth constrained environmentUniversities could host the client on their local Service BrokerProgram developed in modules reduces load-time considerably 15. THANK YOU