Description
信号在长线中传输会遇到三个问题:一是高速变化的信号在长线中传输时出现的波反射现象,二是具有信号延时,三是长线传输会遇到外界干扰。
Leybold TMP50D Turbomolecular Vacuum Pump 55.0 LPS
Varian M6 Diffusion Vacuum Pump 1800.0 LPS
WELCH 1397 DUOSEAL VACUUM PUMP 2 STAGE MODEL 1397U-01
Edwards 250 Water Cooled Trap Used
Leybold Trivac D65B Dual-Stage Rotary Vane Vacuum Pump
Alcatel ADS501 Dry Pump – Used
Osaka TG3213-EM Turbo Pump Used
BOC Edwards QDP40 Dry Pump AS IS