User's Manual

012-05892A AC/DC Electronics Laboratory

➃ Click the “Magnifier” button ( ). The cursor changes to a magnifying glass shape.

➄ Use the cursor to click-and-draw a rectangle around the region of the plot of current and voltage

where the current begins to increase. Make the rectangle tall enough so that its upper boundary is

beyond 2 milliamp (mA).

➅ Click the “Smart Cursor” button ( ).

➆ Move the cursor/cross-hair to the point on the plot where the current reaches 2 milliamps.

Record the value of the turn-on

voltage (X-coordinate) at 2 mA in Data Table 1.

➇ Select “Run #3” from the bottom of the Experiment menu. Repeat the analysis process for the

plot of Current versus Voltage for the second LED.

➈ Select “Run #4” from the bottom of the Experiment menu. Repeat the analysis process for the

plot of Current versus Voltage for the last LED.

DATA TABLE 1: Light-Emitting Diodes

Description Voltage (V) at 2 mA

1. Diode & 1 kΩ resistor

2. Red LED

3. Yellow LED

4. Green LED

PART IIIB: Data Recording - Bi-Color Diode

➀ Carefully bend the wire leads of the CLEAR (bicolor) light-emitting diode so they can fit in the

component springs in place of the last diode you used in Part IIIA of this Unit.

➁ Replace the green LED with the bicolor LED.

➂ Click the “ON” button ( ) in the Signal Generator window.

➃ Click the “REC” button ( ) to begin data recording.

• Data recording will end automatically after 250 samples are measured. Run #5 will appear in the

Data list in the Experiment Setup window.

➄ Click the “OFF” button ( ) in the Signal Generator window.

➅ Describe the behavior of the bicolor LED during data recording. Put your observations in the

Data Table

➆ Turn off the power switch on the back of the power amplifier.