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OPERATION OF THE PHILIPS CM-200 FEG-TEM
When not in use, the CM-200 should be in the MICROSCOPE ON configuration with the HIGH
TENSION ON (illuminates green when the high tension is on).
. The microscope is normally never turned off.
Preliminary
• Add liquid Nitrogen to the Dewar next to the sample holder. (Anticontamination device:) Place the
metal-clad glass vacuum dewar into its holder to the right of the column so that the soft copper wire
"beard" hangs inside it. The glass viewi
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monitor screen will automatically open to the HOLDER SELECTION PAGE. Press the appropriate key (in most cases you'll choose NO COMPUSTAGE B TILT) and then press the READY button (below the data monitor screen). The data monitor screen will return to the previously selected page (normally TEM BRIGHTFIELD).) (iii) After the red indicator light goes out, grip the specimen holder firmly by its black plastic handle and rotate it counterclockwise to 6:00 o'clock position. When it reaches the li
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2.13 If the operator intends to expose TEM negatives using the built-in camera, it is best to ensure that the CCD camera is retracted and shut off so that it cannot interfere with the shutter mechanism. Using the Mac computer, whose CRT and keyboard rest on top on the CM-200 operating console, the operator may open Digital Micrograph (if it is not already open), select MSC from the top toolbar, and from that pull-down menu click to retract the CCD camera. The CCD camera control unit, which
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4.3 From the TEM BRIGHTFIELD page, press COMPUSTAGE once; the COMPUSTAGE REGISTER CONTROL page will appear. 4.4 Press A-WOBBLER; this will initiate back-and-forth tilting of the goniometer. 4.5 Use the Z control lever on the JOYSTICK to move the specimen up or down and thus minimize apparent movement of the centered feature. 4.6 When the feature moves only minimally or not at all, press the A-WOBBLER key to inactivate tilting; then press the READY button to return to TEM BRIGHTFIELD.
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(i) On the lower right-hand side of the page, select CURR (under rot center VOLT CURR) so that it becomes highlighted. This will cause the objective lens current to modulate (the inner STEP SIZE knob adjusts the amplitude of modulation). If the chosen feature shifts off center laterally, the beam is not aligned along the optical axis of the microscope and must be corrected. (ii) Use the MULTIFUNCTION X/Y knobs to stabilize the feature at the center of the screen, eliminating all lateral mo
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9.1 Press STIG button to open the STIGMATOR CONTROL page. 9.2 Select Condense Aperture. 9.3 Use the MULTIFUNCTION X/Y knobs, one at a time, such that the beam spot circle has a fixed center when the beam intensity is changed. 10. High Resolution Images 10.1 Bring in the small screen into viewing chamber. 10.2 TV on. 10.3 Amplifier on. 11. Load Films 11.1 Press CAMERA AIR. 11.2 Put film in. 11.3 PUMP till to IGP less than 10. 11.4 Note films, along with film box should be pu
