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Lab 7 Hints. Activity 1C, 1B. Activity 1A. Battery or power supply (in previous picture). Activity 2. Function generator mimics a battery that switches sign. Oscilloscope lets you see the voltage across capacitor as a function of time. Capacitor. Resistor. Circuit. Capacitor. - PowerPoint PPT Presentation
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Lab 7 Hints
Activity 1C, 1B
Activity 1A
Battery or power supply (in previous picture)
Activity 2Oscilloscope lets you see the voltage across capacitor as a function of time
Function generator mimics a battery that switches sign
Capacitor
Resistor
Circuit
Wires from function generator
Capacitor
Resistor
Connect oscilloscope
Capacitor
Oscilloscope leads
Set up the function generator to mimic a battery that switches
polarity“Square wave” mimics a battery that switches back and forth
Adjusting the oscilloscope
1) Set to “Auto”
2) Set to “Gnd”
3) Adjust until line is in middle of screen. This is the zero voltage line.
4) Set to “DC”
You should see this
Adjust voltage scale (vertical) here.
Adjust time scale (horizontal) here
Adjust the vertical scale (pull center) and trigger level until you get this….
Measure the time constant
• Time that it takes rising curve to reach 5/8 of the maximum
Time constant
Measure the time constant
• Time that it takes falling curve to reach 3/8 of the maximum
Time constant