Experiment - DC Measurements

Record each measured value.

1. Set the DC power supply to provide 3 V as shown in the digital display on the power supply front panel.
2. Set the multimeter to measure DC voltage, making sure the leads are set for voltage, not current measurement.
3. Measure the voltage using the multimeter.
4. Disconnect the multimeter from the power supply and connect the oscilloscope leads to the power supply.
5. Adjust the volts/division knob on the oscilliscope until the voltage appears on the screen. (This should occur around 1 volt/division.)
6. Measure the voltage by using the automatic measuring features of the oscilliscope.
7. Using the same screen, measure the voltage by hand, i.e. count the divisions and multiply by the number of volts per division. (This number can be found in the upper left corner of the screen.)
8. Set the DC power supply to 0 V.
9. Push and hold the CC Set button. While holding down the CC Set button, adjust the current knob until the Amps value displayed on the front panel shows 0.05 A. Then release the CC Set button.
10. Connect a 50 resistor to the power supply.
11. Connect the multimeter across the resistor and set it to measure DC voltage.
12. Increase the voltage (slowly) across the resistor. At approximately what voltage do you expect to observe something unusual? If the change from CV to CC occurs at a voltage read by the voltmeter different from what you expected, explain why.