Download Lab #7

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Lab #7 – Thevenin/Norton
• Activity #1 – finding the Thevenin/Norton
Equivalent for the function generator
– The function generator is a voltage source that
produces an AC voltage, usually a sinusoidal
voltage.
– The waveform produced repeats itself over and
over again, in this case 400 times per second
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BK Function Generator
Choose Sine
Adjust the frequency knobs
to the desired frequency.
Turn on
Adjust output
Voltage
Select the
range
Output terminal
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Lab #7 – Thevenin/Norton
• Activity #1 – finding the Thevenin/Norton
Equivalent for the function generator
– The multimeter is used to measure the RMS
(root mean square) voltage (or effective DC
voltage because it supplies as much power as a
DC voltage source would.)
– The DMM can also measure the frequency of
the source.
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Digital Multimeter (DMM)
Range is set
automatically
Power switch
AC voltage
AC current
Press the AC voltage button to get the RMS value of AC part of waveform.
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Digital Multimeter (DMM)
FREQ
2ND
You can display the Frequency at the same time by pressing the 2ND button
and then pressing the FREQ button.
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Activity #2 – Max Power
• Now that you have Rth = RN you can
measure the output voltage for different
loads and calculate the power delivered to
each load.
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Activities #3-5 – Simulations
• Find Vth
– Find open circuit voltage for
• Circuit with only independent sources
• Circuit with both independent and dependent
sources
– Vth=0 for circuits with only dependent sources
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Activities #3-5 – Simulations
• Find Rth
– For circuits with only independent sources
• By source removal, short circuit current or by
applying a load
– For circuits with only dependent sources
• Connect a test source to the output
– For circuits with both types of sources
• By short circuit current, by applying a load or by
connecting a test source to the output