Справочник Пользователя для PASCO Specialty & Mfg. AC/DC Electronics Laboratory EM-8656

63

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.

1. Diode & 1 k

Ω

 resistor

2. Red LED

3. Yellow LED

4. Green LED

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.