PASCO EM-8656 AC_DC ELECTRONICS LABORATORY - Manual (Page 68)

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AC/DC Electronics Laboratory 012-05892A
®
ANALYZING THE DATA: Bi-Color LED
➀
Select “Save As…” from the File menu to save your data.
➁ Select “Run #5” from the bottom of the Experiment menu.
➂ Click the “Autoscale” button ( ) to resize the Graph to fit the data.
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 on the RIGHT hand part of the plot. 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 2.
➇
Again click the “Magnifier” button ( ).
➈ 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 on the LEFT hand part of the plot. Make the rectangle deep
enough so that its lower boundary is below -2 mA.
➉ Click the “Smart Cursor” button ( ).
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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 the Data Table 2.