Module5 - Physics 434 Autumn 2007 Module 5 Design of a...

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Physics 434 Autumn 2007 Module 5 Design of a Capacitance Meter (Lab & writeup thanks to Prof. Toby Burnett) Introduction The goal of this lab is to design an apparatus, and corresponding VI, to measure the capacitance-value of a capacitor. This can be done either in the frequency domain, by measuring the reactance as a function of frequency, or in the time domain, by measuring the RC decay time. In either case, one sldo needs an appropriately-sized resistor, of course carefully measured, You can use the NI PCI-E board for the measurements, the Agilent DMM 34401A, or the Tektronix scope. These latter use serial interfaces, GPIB and RS-232. The LabVIEW support for serial devices uses a general scheme called Virtual Instrument Software Architecture (VISA). A goal of this module is to gain some familiarity with serial devices like these. Study the device: Agilent DMM (digital multi-meter) An advantage of this device is that its DAC has a much better precision than the PCI-E board. First familiarize yourself with hand operation, checking measurements of DC
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