ClassNotes8 - Module 5 Serial devices using VISA(LabView...

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Physics 434 Module 5 Lab & writeup thanks to Prof. Toby Burnett 1 Module 5 – Serial devices using VISA (LabView for “Virtual Instrument Software Architecture”) An application to measure capacitance
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Physics 434 Module 5 2 Examples of “serial interfaces” RS232 (dumb terminal) HPIB GPIB (general purpose instrument bus) “Fire wire” USB
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Physics 434 Module 5 3 The Agilent (nee HP) 43310A voltmeter: example of a GPIB instrument
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Physics 434 Module 5 4 You could measure in the frequency domain: A low-pass RC filter 100 1 . 10 3 1 . 10 4 1 . 10 5 0.01 0.1 1 10 Bode plot for a low-pass RC filter frequency (Hz) |H(f)| 1 2 1 2 π R C
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Physics 434 Module 5 5 You could measure in the time domain (à la Module 4) Apply a square wave, measure response, charge or discharge May not seen serial device; at least use Agilent to measure resistor 0 1 . 10 4 2 . 10 4 3 . 10 4 4 . 10 4 5 . 10 4 0 0.2 0.4 0.6 0.8 discharge charge RC circuit time (s) voltage across capacitor R 1 10 3 × = C 1 10 7 - × =
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Physics 434 Module 5 6 Main points (see the doc)
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