可能出现的共模电流(ICM)从电压表的输入低端流到仪器的机箱公共端，经过大地再流到电压源的地。
Any common-mode current (ICM) that may be present flows from the voltmeter input lo to instrument chassis common, through earth ground to voltage source ground.
额外的刚性底盘的特点球磨的口袋，从顶部的底盘那里的所有部分连接或安装到机箱。
The extra stiff chassis features milled pockets from the top of the chassis where all parts are connected or mounted to the chassis.
FFU主要由低噪声风机和高效空气过滤器及机箱组成，适用于从1 ~ 10000级的各种等级洁净室或洁净区域。
FFU is consisted of low-noise fan and HEPA filter in the housing. It can be used in the clean room and clean area with various classes of cleanliness from 1 ~ 10000.
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