2)共模干擾：這種干擾來自于觸摸屏設備內部(如電源、質量不好的充電器)并通過手指釋放到地面。

干擾包括寬帶與窄帶噪聲，通常振幅較高。我們看到，共模干擾的頻率可達500kHz，振幅可達40Vpp。見圖2

廈門岳航計算機工程有限公司

聯系人：李素云

企業QQ：2851195446，2851195466

手機：18965423501

座機：0592-5165501

圖2：窄帶和寬帶充電器干擾圖

在兩種情況下，用戶都會看到誤觸的情況;包括報告誤觸坐標或造成觸摸傳感器過載(觸控會顯示為沿Rx傳感器伸展的長線條)。這會導致流水線收到錯誤指令并造成延遲。在很多情況下，干擾脈沖會充滿接收電容器，從而遺漏本應記錄在該交叉點上的觸控信號并影響整體觸控體驗。良好的信噪比(SNR)是觸摸屏控制器抵抗各種干擾的必要條件之一。

Pilz PNOZ 11 7S/10 Safety Relay

Struthers Dunn 219 BBX PM Dunco Relay 12 Pin 24VDC

Allied Control PO-12A Relay

Struthers Dunn 219BBX-P Relay 12 Pin

Telemecanique PO-12A Allied Control Relay

Allen Bradley 700-HN100 Relay Terminal Ser D

ELCO RM8-24DZ Relay Base 8 Slot

Allen Bradley 193-BSA90 Overload Relay

Allen Bradley 193-EA1DB Relay

Omron PF083A-E Relay Socket 8 Pin

Omron P2RF-05-E Relay Socket

Omron MK3P5-S Relay 11 Pin

General Electric CR 4 G 1 WN Relay

EGC RLY3323 Relay Coil 24V

Allen Bradley 700-HN121 Relay Socket

Allen Bradley 193-EA1FB Overload Relay W/ 193-EPM1

Allen Bradley 193-A1E1 Overload Relay W/ 193-BPM2

Telemecanique RE4 RL13BU Timing Relay

Allen Bradley 700-HA32Z24 Relay (NIB)

Allen Bradley 700-HN100 Relay Terminal Series C

Siemens V23057-B3006-A101 Relay

Allen Bradley 193-EA4CB Overload Relay

Allen Bradley 700-HA32Z24 Relay

RS Components 349-800 Current Sensing Relay Supply

1746-NO8V

1746-NO8I

1746-NO4V

1746-NO4I

1746-NIO4V

1746-NIO4I

1746-NI8

1746-NI4

1746-NI16V

1746-NI16I

1746-N2

1746-IV8

1746-IV32

1746-IV16

1746-ITV16

1746-ITB16

1746-IO8

1746-IO4

1746-IO12DC

1746-IO12

1746-INT4

GE CL02A310T Relay Contactor

GE RL4RA022T Relay Contactor 120 Coil 20 Amp W/ BTLF30C

GE RL4RA040T Relay Contactor 24 Coil W/ GE BTLF30C

MSD Inc. A425BXX 30 Amp 120V Coil 1 HP 120/240 VAC

Square D Overload Relay Thermal Unit B0.71 Used

GE CR120K22003AA Time Delay Relay 230V 60 Hz