In our case, the program controls the function generator, multimeter, and Keithley meter. The program uses a programing environment called LabVIEW that is particularly well suited for automatic data acquisition and analysis. Start the LabVIEW application from the desktop by double clicking the LabVIEW icon. Run the VI by selecting Operation , then Run from the Menu at the top of the LabVIEW window. Enter appropriate values for the parameters that control the measurement.
More details appear below .
You can then observe the results of your measurement, which appear in the current vs. voltage plot on the screen. There is also an analysis tool built into the VI that allows you to extract transistor parameters such as current gain, output resistance, or Early voltage from your plot. For V1, V2, and V2 region 2, the voltage sweeps from the value indicated in the Start box to the value indicated in the Stop box with voltage steps of Step . It is there so that you can perform a sweep with two different step sizes. Read the next example to see how V2 is used.