描述
屏蔽地(AG,Analog Grounding)也叫模拟地,它可以把现场信号传输时所受到的干扰屏蔽掉,以提高信号精度。DCS系统中信号电缆的屏蔽层应做屏蔽接地。线缆屏蔽层必须一端接地,防止形成闭合回路干扰。铠装电缆的金属铠不应作为屏蔽保护接地,必须是铜丝网或镀铝屏蔽层接地。接入公共接地极。
Varian Vacuum Ion Pump 912-7022
Edwards BOC iL70 Dry Semiconductor Vacuum Pump
NASH H12A VACUUM PUMP TEST #01T1C56 POS NR1 CAST IRON
RROTARY VANE OIL VACUUM PUMP WIITH MOTOR MVP-540 NIB
CTI Cryogenics 8112729G001 On-Board 4F Cryopump NEW
One-day shipping available
Edwards Vacuum Turbopump STP-XH2603P new 3620-00368