Lab 0 part 2: Lab Kits and the nScope

Objective: Get familiar with the tools in your nScope kit.

Skills Learned: Breadboarding, using a multimeter, and using the nScope.

  1. A multimeter is a tool for measuring a variety of electrical properties. Plug the black probe into the COM pin, and the red probe into the VRM… pin. To measure the voltage across a component, set the dial to Vbar 20V, and touch the red probe to the more positive side, and the black probe to the more negative side. You can also use alligator clips to connect to a part or wires.
  2. Build the following circuits: (image)
  3. Use your multimeter to measure the voltage across:
    • VR1
    • VR2
    • VD1
    • VD2
  4. To measure voltage with the nScope, cut a long wire and strip both ends. Plug one end into the voltage you want to read, and the other into a CH pin on the nScope.
  5. Use the nScope to measure the voltage at points:
    • VA
    • VB
  6. Use the multimeter to measure the current through:
    • ID1
    • ID2
  7. Replace R1 and R2 with 100(ohm) resistors. Use your multimeter to measure the voltages and currents:
    • VR1
    • VR2
    • VD1
    • VD2
    • ID1
    • ID2
  8. Replace D1 with a green LED. Use your multimeter to measure the voltages and currents again:
    • VR1
    • VD1
    • ID1
  9. (image) Replace the +5V supply with the function generator output A1. Set the output to a sine wave, unipolar, with an amplitude of 4.75V and a frequency of 0.1Hz. Simultaneously measure the voltage at A1, the voltage at point C, and the current through D3. Describe the difference between the two voltages, and how they relate to the current through the LED and the LED brightness. What is weird about the LED?