Philips CM12 manual Powering Up the Microscope, Saturating the Filament

Erwin Sabio Philips CM12 Alignment & Setup Manual Page 7

Powering Up the Microscope

1.Start by logging in to the computer connected to the TEM. Login is a necessary step to prevent unauthorized users from accessing the microscope. Without login, the control panel is not accessible.

2.Turn on the control panel by pushing the Power Switch [13] on the left hand side of the screen.

3.At this point, the main menu will appear on the computer screen. (Note: pressing the READY [19] button at any time will revert the screen back to this menu)

Figure 6 The main menu screen of the

CM12 TEM

4.Select VACUUM from the main menu to check for the vacuum settings. P3 must be less than 50 while IGP must be less than 35.

5.Before powering the gun, go to MODE > TEM > PARAMETER from the main screen to check the current and voltage setting that will be applied to the gun. Ideally the current should be around 3 and the voltage at 100keV and should be kept at these levels.

6.Finally, push the HIGH TENSION [17] button to turn on the current on the electron gun. Wait for the needle in the emission meter [16] to kick twice to full deflection then return to the zero position, after which the microscope is fully powered up for operation.

Figure 7 The needle will kick twice to the right after the High Tension button is turned on.

Saturating the Filament

1.Once the microscope is powered up, the filament must be heated to adjust the intensity of the electron beam.

2.Go to MODE > CONFIGURATION to view the filament saturation window. The screen will show a FIL LIMIT of 24 indicating maximum saturation.