BK Precision 4011A Provozní pokyny stáhnout pdf (Strana 27)

Laboratory 5: Oscilloscope

201015

a) Estimate the worst-case RMS current that might pass through the resistor and the power

dissipated in the resistor by assuming the coil is replaced by a shorting wire. The low-

power resistor decade box has a ½-amp fuse, and the resistors are rated for ½ Watt. Are

such ratings adequate for this circuit? If not, be sure to use the Power Resistor decade box

for this circuit.

b) The 60 Hz AC voltage is approximately 10 V

rms

. Measure the input voltage on CHANNEL

1 of the oscilloscope and compare that to the voltage drop measured across the 100Ω re-

sistance on CHANNEL 2. What is the phase shift of the voltage waveform? The phase shift



can be calculated in degrees by the following formula:



= t · f ·360°

where



is the phase shift, f is the frequency, and t is the time difference between the

two waveforms.

10 V

rms

120 mH

100 Ω

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BK Precision 4011A Provozní pokyny Strana 27