摘要
为保证图象的清晰度，电子显微镜的灯丝多采用Ｖ形结构，并工作于饱和状态，因此灯丝寿命一般只有３０～５０ｈ。专用保护器具有Ｖ形阻－温特性，能有效地防止冲击电流的产生，抑制过载电流，使灯丝寿命至少可延长到６０～８０ｈ。
To obtain a clarity, EMS filaments are usually made in V shape, and work under the saturating conditions; therefore, its life is only as long as 30 to 50 hours The protector can prevent surge current and suppress over load current for its V sahpe R T characteristic Whit the protector, the filament life reaches 60 to 80 hours
出处
《电子元件与材料》
CAS
CSCD
1997年第6期41-44,共4页
Electronic Components And Materials
关键词
电子显微镜
灯丝
保护器
热敏电阻器
EMS, filament, protectors, PTCR thermistors, R T characteristic
