1. There are two programs we will use,the iv program and the K, Vt program. To order the program you first need to push the GET key. This tell the unit that you are about to enter the desired program. Just type in the name of the program prefixed by a 'p'. *note* The program for the iv curves is IV450, the program for K and Vt is K452.* After you push GET, followed by 'p' and the name of the program, push the EXECUTE key. eg: GET PIV450 EXECUTE.

2. Having done this you will notice that nothing changes. Push the NEXT key to enter into the program.

* The following is for the IV curve program. See below for the K and Vt program

3. You are now on the channel definition page. You will see the first column full of SMU 1-4. Down the second column you will see what each SMU corresponds to. It is important that you follow the wire from the SMU box(located next to probe station) back to the probe tip. Determine which node this is and verify that this matches up with what the channel definition page says. If there is a difference, change the connections at the SMU box.

4. Now push the NEXT key. On this screen, the source set-up page, you can make any adjustments to Vds, Vg, step amount, # of steps, etc. To do this use the cursor arrows to move to the appropriate field and alphanumerics followed by the ENTER key.

5. Push the NEXT key again. On this page you can make any desired adjustments in hte display scale values using the cursor arrows to move to the appropriate field. Use the alphanumerics followed by the ENTER key to enter new values. Basically this page allows you to place the origin anywhere on the screen.

6. Again, push the NEXT key. This is the measurement screen. To make a measurement, make certain that the probe tips are down and that you are not bumping the table! Push the SINGLE key to measure. If you want to stop the measurement in progress, press the STOP key. Once the measurement is taken you may want to auto-scale it by pressing the AUTO-SCALE softkey.

7. To get a printout of the measurement, press the PLOT key followed by the EXECUTE key. All you need to do is to ensure that there is paper on the plotter and that it is correctly placed.

*Now for the K and Vt program.

8. After getting your measurement you will want to find the slope of the line and also the x and y (if there is a y) intercepts. To do this, just follow the directions given below:

• Press the brown softkey EXTN to get the marker option on the softkey menu.
• Press the softkey MARKER to get the marker up on the screen. Using the marker wheel, move the marker to the desired point.
• Press the softkey EXTN twice. This brings up a new softkey menu. To move the crosshair to your marked point, push the softkey CURSOR.
• Now push the softkey LINE-ON to get the slope line on the screen. You should now have one marked point on the slope line.
• To get the second point (to define where you want to see the slope), simply move the marker wheel again until marker reaches desired point and push the softkey CURSOR again.
• At the bottom of the screen you can see that your x and y intercept values are given. Also given is the slope of the line. It is given as 1/grad.

Hopefully this tutorial, along with one you will receive in lab, will prepare you to feel comfortable with the 4145. Note: there is no need to turn power to the 4145 on or off, since the TA will do this.