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Physics 434 Module 1, week 2

Physics 434 Module 1, week 2. Finish (by today) the preliminary voltage-divider analysis VI. Wire up the FET current-control device. The FET: why do we need it?. The IRF511 power MOSFET Transistor. Set the voltage here…. And measure the voltage and current here. Requirements for your VI.

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Physics 434 Module 1, week 2

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  1. Physics 434 Module 1, week 2 • Finish (by today) the preliminary voltage-divider analysis VI. • Wire up the FET current-control device

  2. The FET: why do we need it? The IRF511 power MOSFET Transistor. Set the voltage here… And measure the voltage and current here

  3. Requirements for your VI • Data: • current and voltage vs. applied voltage. (Nearly identical to the plot you made for the simple divider) • A hint: do not assume the “22” resistor really is! • Analysis: • Resistance vs. current for the bulb • Comments: • Beware that you will need to introduce a delay from changing the current to measuring the resulting voltage and current. Think about how to decide how much you need • The current setting of the DC voltage VI is for -10 to +10 volts: you get more accuracy if you reduce it to the range that you really need. (If you do so, this should be mentioned in your documentation) • The ACDs are by default -10 to 10; change to 0 to 5 (factor of 4 more accurate)

  4. Use vi libraries (llb files) • Get from tools | LLB manager • Use New to make a new llb file • Advantages • Behaves like a folder (in Windows at least): drag/dropdouble-click to open … • SubVI’s are automatically found • Must use to submitmultiple VI’s to catalyst

  5. Graph demo shows multiple plots

  6. Turning in your VI(s) • Edit | Make current values default – needed to record your results • File | VI properties | Documentation: write a little report, containing your name(s), purpose of the VI, implementation features, conclusions.

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