{"id":5460,"date":"2026-08-07T06:55:36","date_gmt":"2026-08-06T21:55:36","guid":{"rendered":"https:\/\/www.aem.imr.tohoku.ac.jp\/?p=5460"},"modified":"2026-08-07T06:55:36","modified_gmt":"2026-08-06T21:55:36","slug":"jem-2100plus%ef%bc%9a%e7%b5%9e%e3%82%8a%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.aem.imr.tohoku.ac.jp\/en\/jem-2100plus%ef%bc%9a%e7%b5%9e%e3%82%8a%e6%93%8d%e4%bd%9c\/","title":{"rendered":"JEM-2100plus: Aperture Control"},"content":{"rendered":"\n

Note: This page was translated by AI from the Japanese original. In case of any discrepancy, the Japanese version shall prevail.<\/em><\/p>\n\n\n\n

Original post date (Japanese version): June 22, 2024<\/em><\/p>\n\n\n\n

💡 This page is a quick manual for the JEM-2100plus.\nThe contents are subject to change.\nPlease receive training in advance before actually using the equipment.<\/p>\n\n\n

💡 Operation of various apertures<\/p>\n\n\n

Condenser Aperture<\/h3>\n\n\n
    \n
  1. [PANEL-R : Function : MAG1] Image observation mode<\/li>\n\n\n\n
  2. [PANEL-R : STD FOCUS] Recall objective lens reference current\n
      \n
    1. Just in case<\/li>\n<\/ol>\n<\/li>\n\n\n\n
    2. [PANEL-R : MAG\/CAM L] Magnification setting<\/strong><\/span> (around x20~50K)<\/li>\n\n\n\n
    3. Beam centering<\/strong><\/span>\n
        \n
      1. [PANEL-L : BRIGHTNESS] Converge the beam on the fluorescent screen. (Crossover)<\/li>\n\n\n
      2. [PANEL-L : DEF\/STIG : BRIGHT TILT] Select bright field illumination mode<\/li>\n\n\n
      3. [PANEL-L\/R: SHIFT-X\/Y] Center with Beam Shift<\/li>\n<\/ol>\n<\/li>\n\n\n\n
      4. [PANEL-L : BRIGHTNESS] Expand the beam to about the same size as the screen<\/li>\n\n\n\n
      5. [CLA: Aperture selection knob] Select the diameter of the condenser aperture.<\/li>\n\n\n\n
      6. [CLA: Aperture position adjustment knob: Front\/Rear \/ Left\/Right] Move the aperture to the center of the screen.<\/li>\n\n\n\n
      7. Confirm that the beam changes concentrically when BRIGHTNESS is changed.\n
          \n
        1. Because the position when the crossover is displayed shifts due to lens hysteresis, there is no need to strictly pursue it at high magnification<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n

          Selected Area Aperture<\/h3>\n\n\n
            \n
          1. [PANEL-R : Function : MAG1] Image observation mode\n
              \n
            1. [OLA\/HCA] If the objective aperture is inserted, open it.<\/li>\n<\/ol>\n<\/li>\n\n\n\n
            2. [SA: Aperture selection knob] Select the diameter of the selected area aperture.<\/li>\n\n\n\n
            3. [SA: Aperture position adjustment knob: Front\/Rear \/ Left\/Right] Move the aperture to the center of the screen.<\/li>\n<\/ol>\n\n\n

              Objective Aperture (HC: High Contrast)<\/h3>\n\n\n
                \n
              1. Simple\n
                  \n
                1. [PANEL-R : Function : MAG1] Image observation mode<\/li>\n\n\n
                2. [HCA: Aperture selection knob] Select the diameter of the selected area aperture.<\/li>\n\n\n
                3. [HCA: Aperture position adjustment knob: Front\/Rear \/ Left\/Right] Move the aperture to the center of the screen.\n