Model AC-2 Simplified Operating Instructions

2/1/08

Turning on and warmup of Model AC-2

①Supply compressed air between 70 psi to 90 psi (0.5－0.6Mpa). If this has been turned off, please turn ON now.

②Turn ON POWER SW of personal computerand start up Windows.

③TurnON POWER SW on the front surface panel of AC-2 (LC1).

④Warm-up will now take about 30 minutes. During this time, the green Pilot Light will be blinking on both parts of the AC-2. When green Pilot Light is steady on (not blinking), then warm-up is completed.

⑤Open Windows AC-2 program by double-clicking AC-2 icon on PC.

⑥Open AC-2 Desktop folder in upper left of screen by clicking once on it.

⑦Enter the Measurement(M) in the menu bar, and select Connection(N). (AC-2 will now make noises for approx. 10 minutes as it initializes the light adjuster and sets anode volts. When finished with each step, a screen will appear that says “Anode voltage, Measurement finished” Press OK. Then wait 2 minutes for screen to say “AC-2 Ready, AC-2 Initialize Finished” Press OK.

Operation of the Model AC2.

⑧Select desired folder to store today’s data in. Activate folder by clicking on it once. If a new folder is desired instead, go to FILE, and select New Folder. Name the new folder appropriately and press ENTERto register and activate the new folder.

⑨Go to Measurement(M) from menu bar, and select WORK FUNCTION. The Work Function screen will now be displayed.

Set Measurement Parameters:

⑩Name sample: Put cursor in the right side of sample name box and click. Type in new sample name.

⑪Set Starting Energy Level: Default is 4.20 eV. If you wish to start at a different energy level, put cursor on value and click and hold mouse, and a drop box will appear. Select the desired starting energy level with the mouse and then release the mouse.

⑫Set Finish Energy Level: Default is 6.20 eV. If you wish to stop at a different energy level, put cursor on value and click and hold mouse, and a drop box will appear. Select the desired finishing energy level with the mouse and then release the mouse.

⑬Set Step: Default is 0.10 eV, which means that the eV energy will increase in 0.10 eV increments. If you wish to use a different step increase, put cursor on value and click and hold mouse, and a drop box will appear. Select the desired energy step increment with the mouse and then release the mouse.

⑭Counting Time is fixed and cannot be changed.

⑮Set up UV Intensity: If it is desired to change the UV Intensity, put cursor to the right of Target of UV Intensity, and click the mouse. Now type in the desired UV Intensity, and press ENTER. (UV intensity range that can be set is indicated on the screen as UV Intensity Min and Max.) Now go to Measurement(M)in the menu bar and select UV Intensity Adjustment(L). A message box of UV Intensity Adjustment is displayed; click yes. Now wait about 3 minutes while adjustment is made. When adjustment is completed, the UV intensity value will match the target value (or be very close). Another message box will appear indicating it is finished; click OK.

⑯Select Quantity of light correction coefficient: If this is the first time to use the AC-2 today, this value needs to be changed. The light correction data is changed at a later step however. So, for now, the old data in the system must be deleted. To delete, put cursor on the Quantity of Light Correction Coefficient, then right click and hold the mouse. Select Adjustment DataDelete. Value on screen will be changed to NONE.

⑰Input Power Number: Default Power Number is 0.5 (for metal sample). If it is desired to change the Power Number, put cursor to the right of Power Number, and click the mouse. Now type in the desired Power Number, and press ENTER.

Mounting the Sample.

⑱From Menu bar, select Measurement(M), and select Sample(S).Click YES on message box.

⑲Internal sample plate will be moved forward. When noise stops, press and release SAMPLE DOOR to open door.

⑳Place sample on the left side of sample plate. Pull Height Gauge to the right to rest over the sample. Then, rotate height handle wheel (located under sample plate), so that the top of the sample just rests against the height gauge probe.

21Move sample to center of sample plate, and hold in place with sample clips. NOTE: Sample clip grounds the sample to remove static voltage. If sample is on a non conductive substrate, then each conductive part of the sample must be touched to the sample clip momentarily to ground it before the sample substrate is clipped to the sample plate.

22Close the sample door and press on PUSH until it clicks shut. Once shut, click OK on screen.

Measurement

  1. From menu bar, select Measurement(M), and then Measurement(G), and then the measurement will start. Each data point will be plotted in turn on the graph over the next 5 to 10 minutes.
  1. When measurement is finished, an information block will appear on the screen. Press OK. Another information block will appear asking if you want to save the data. Press YES (unless you don’t want to save the data).
  1. Remove the sample: Select Measurement(M) and then Sample(S) from menu bar. This will move the sample forward internally. Once the noise stops, open the door and remove the sample. Close door, and then click OK on screen.
  1. If next step is to do another work function measurement, then return to step 10. After the first work function measurement of the day, Quantity of Light Correction Coefficient must be done. Also, if the UV Intensity has been changed for any samples, the Quantity of Light Correction Coefficient must be done for each UV Intensity. Also, if the material type measured is changed, the Quantity of Light Correction Coefficient must be done for each different material. To do the light correction, do steps 27 through 34 below.

Quantity of Light Correction Coefficient measurement

  1. Quantity of Light Correction Coefficient: First exit the work function screen by selecting File, and then Close, from the menu bar. Then, select Measurement(M), and then Quantity of Light Correction Coefficient(L). This opens the Measurement: Light Spectrum screen.

  1. Input the light coefficient name. Typically this should be the UV Intensity, such as 10 nW, and today’s date.
  1. Input Start Energy: Typically this is 4.2 eV, but this value should be set to the lowest value that you intend to use for measurements today.
  1. Input Finish Energy: Set to 6.2 eV
  1. Input Step: This value should be set to 0.10 eV increments.
  1. UV Intensity: Leave as it is.
  1. From menu bar, select Measurement(M) and then Measurement(G). This will start the Quantity of Light Correction Coefficient test. This test takes about 5 minutes. When completed, a message box appears on the screen. Press OK. Then, a second message box opens asking if you want to save the data. Press YES to save.
  1. Exit the Light Spectrum screen: Select FILE(F), and then CLOSE(X).

Determining the Work Function (or Ionization Potential) from the data:

  1. Data Manager window should be open. If it is not, then select Data Manager button from menu bar. Then select Display(D) and Data Manager(D).This opens the Data Manager window.
  1. Perform Light Correction onto data: First, confirm that today’s Work Function data folder is open. Select Light Spectrum Data Fileto use for this correction. Copy the light correction data and paste onto the Work Function data file that you wish to correct.
  1. Select Work Function Data File desired to be analyzed, and select File(F) and then Open(O).This opens the single graph screen.
  1. Establish background line:Click and drag Mouse to select all representative data points along the horizontal axis. Do not select points that are starting to curve upwards. Then, right click the mouse and select Ground Level. This will draw the ground level (background) line.
  1. Establish Regression line: Click and drag mouse to select representative sloped data points. Then right click mouse and select Regression Line. This will draw a sloped line.
  1. Work Function and Slope will be calculated and displayed on the screen on the right hand column.

How to Copy to other Windows programs:

  1. Graph, Data table, or data Status List can be copied and saved to be sent to other Windows programs. To copy, click mouse in desired screen section, then select Edit(E) and Copy(C) from the menu bar. Save where desired. Repeat for the other screen sections.

Back Up of Data Base:

  1. It is recommended to make a backup of the AC-2 Data regularly. The “ac2.mdb” is the data base stored with the measurement data from the AC-2. Initially, this is located in AC-2 for Windows of Program File.

Shutting Down the AC-2

  1. Select File(X) and Close(X). Repeat until all programs are closed.
  1. Turn OFF power switch on AC-2 front panel. Then turn off PC.

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