BK Precision 4011A Instruções de Operação descarregar pdf (Página 33)

Laboratory 7: Network Theorems

201021

33kΩ

0.01µF

rms

nal contacts on the switches get dirty and give high resistance. If that happens, flip the

switch a dozen times or so to clean the contacts and measure again.]

b) Set the ammeter scale to its maximum. With the power output off, connect the ammeter

from A to B. Turn on the power and measure the short-circuit current, I

, from A to B,

decreasing the meter’s scale setting to produce the most accurate reading. You are using

the ammeter’s very low resistance to short A to B.

c) Compute the Thévenin resistance, R

, by:



d) Construct the Thévenin equivalent circuit from this data, and compare it with the original

circuit.

2. Thévenin’s Theorem, AC circuit.

a) Construct the circuit shown. Use the function gen-

erator as the AC source, with an output of 5V

rms

and a frequency of 1000Hz. Measure the voltage

across A-B; this is only the rms magnitude of V

b) Measure the short circuit current between A-B; this

is only the rms magnitude of I

c) Analytically determine the Thévenin equivalent

circuit, and compare the experimentally measured values of V

and I

to the calculated

values.

3. Principle of Superposition

a) For the above circuit, calculate V

, the voltage drop across the 3.3kΩ resistor, using the

principle of superposition.

b) Build the above circuit and measure V

. [To obtain the 2.0kΩ, use a Resistance Load

Box (either Hampden or ECE) with one switch flipped up and the other switches flipped

down. Confirm the resistance before proceeding.]

–

4.7kΩ 2.0kΩ

–

3.3kΩ

–

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