Sources:
-S-3500NH-S3000NH-S2600NH Schematics Manual.pdf: http://www.orionmicroscopy.com/files/SEMpics/Hitachi/Original%20Hitachi%20Schematics/S-3500NH-S3000NH-S2600NH%20Schematics%20Manual.pdf
-SU8000FamilyBrochure.pdf: http://hitachi-hta.com/sites/default/files/literature/SU8000FamilyBrochure.pdf
-20100628062005150.pdf: http://www.microimage.com.cn/uploadfile/xwjs/uploadfile/201006/20100628062005150.pdf