BK Precision 4011A Instrucciones de operaciones descargar pdf (Pagina 39)

Laboratory 10: AC Measurements

201027

Procedure:

Connect the following AC circuit.

12 V

rms

Change the load Z

, as follows:

1. A resistor of R = 25Ω

2. An inductor of L = 120 mH

3. A capacitor of C = 40 µF

4. R and L in series

5. R and C in series

6. R, L, and C in series

Measurements

For each of the loads listed above:

a) Measure the wattmeter reading.

b) Measure the total current.

c) Measure the voltage drop across each element.

For loads 4-6 also measure the current phase shift. This is done by using the oscilloscope to

measure the voltage waveform shift across the resistor on Channel 2 versus the source voltage on

Channel 1. The resistor must be the last element in the series combination for the measurement

to work properly.

Laboratory Notebook:

1. For each step compute the impedance and power factor for the load. Tabulate the measured

and computed data.

2. Construct a phasor diagram, to scale, for each of the steps. Show all currents and voltages on

each diagram in their correct relative orientations. In parts 4-6 show that the line voltage is

the phasor sum of the voltage drops across the elements of the circuit.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 72 73

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BK Precision 4011A Instrucciones de operaciones Pagina 39