日立 HITACHI S-2700 扫描电子显微镜用途：适用于材料科学、生物学、半导体等多领域。可对各类样品，如金属、陶瓷、生物切片等进行微观表面结构观察，获取表面形貌、颗粒大小及分布等信息，还能结合能谱仪开展微区化学成分分析。技术原理：电子枪发射电子束，在加速电压作用下，经电子透镜聚焦后扫描样品表面。样品受电子束激发，产生二次电子、背散射电子等信号。仪器收集并放大这些信号，转化为图像以呈现样品微观特征。性能：加速电压可在 0.2 - 3kV 间以 100V 为步长调节，3 - 30kV 间以 1kV 为步长调节；最大发射电流 300μA；二次电子像分辨率可达 4nm；放大倍率 15X（工作距离 50mm 时） - 300,000X；真空系统为全自动气动阀门系统，极限真空度 7×10⁻⁴Pa 。Product Name: Hitachi HITACHI S-2700 Scanning Electron MicroscopePurpose: It is applicable to multiple fields such as materials science, biology, and semiconductors. It can observe the micro surface structures of various samples like metals, ceramics, and biological sections, obtaining information such as surface morphology, particle size and distribution. It can also conduct micro-area chemical composition analysis in combination with an energy spectrometer.Technical Principle: The electron gun emits an electron beam. Under the action of the acceleration voltage, it is focused by the electron lens and then scans the sample surface. The sample is excited by the electron beam to generate signals such as secondary electrons and backscattered electrons. The instrument collects and amplifies these signals and converts them into images to present the micro characteristics of the sample.Performance: The acceleration voltage can be adjusted in steps of 100 V in the range of 0.2 - 3 kV and in steps of 1 kV in the range of 3 - 30 kV. The maximum emission current is 300 μA. The resolution of the secondary electron image can reach 4 nm. The magnification is 15X (when the working distance is 50 mm) - 300,000X. The vacuum system is a fully automatic pneumatic valve system, and the ultimate vacuum degree is 7×10⁻⁴ Pa.