因維斯 3502E   因維斯 3502E  因維斯 3502E  
外觸發(fā)使用外加信號作為觸發(fā)信號，外加信號從外觸發(fā)輸入端輸入。外觸發(fā)信號與被測信號間應(yīng)具有周期性的關(guān)系。由于被測信號沒有用作觸發(fā)信號，所以何時開始掃描與被測信號無關(guān)。 　　正確選擇觸發(fā)信號對波形顯示的穩(wěn)定、清晰有很大關(guān)系。例如在數(shù)字電路的測量中，對一個簡單的周期信號而言，選擇內(nèi)觸發(fā)可能好一些，而對于一個具有復(fù)雜周期的信號，且存在一個與它有周期關(guān)系的信號時，選用外觸發(fā)可能更好。
　　2．觸發(fā)耦合(Coupling)方式選擇 　　觸發(fā)信號到觸發(fā)電路的耦合方式有多種，目的是為了觸發(fā)信號的穩(wěn)定、可靠。這里介紹常用的幾種。 　　AC耦合又稱電容耦合。它只允許用觸發(fā)信號的交流分量觸發(fā)，觸發(fā)信號的直流分量被隔斷。通常在不考慮DC分量時使用這種耦合方式，以形成穩(wěn)定觸發(fā)。但是如果觸發(fā)信號的頻率小于10Hz，會造成觸發(fā)困難。 　　直流耦合(DC)不隔斷觸發(fā)信號的直流分量。當(dāng)觸發(fā)信號的頻率較低或者觸發(fā)信號的占空比很大時，使用直流耦合較好。 　　低頻抑制(LFR)觸發(fā)時觸發(fā)信號經(jīng)過高通濾波器加到觸發(fā)電路，觸發(fā)信號的低頻成分被抑制；高頻抑制(HFR)觸發(fā)時，觸發(fā)信號通過低通濾波器加到觸發(fā)電路，觸發(fā)信號的高頻成分被抑制。此外還有用于電視維修的電視同步(TV)觸發(fā)。這些觸發(fā)耦合方式各有自己的適用范圍，需在使用中去體會。 ALLEN BRADLEY 20B D 2P1 A 0 NYNANA0 20BD2P1A0NYNANA?0 1...     FISHER SERIAL INTERFACE COMMONX1-AA2 COMMONX1AA2 39A857...     ALLEN BRADLEY I/O SCANNER COMMUNICATION ADAPTER 1775-S5...     GENERAL ELECTRIC GE CIRCUIT BOARD IC660ELB900E refurb     Reliance PGAE Board 0-51879-4 0518794 51879-4 NIB     Yaskawa Electric Servopack Servo Drive CPCR-FR02AJ CPCR...     YOKOGAWA DYNASERV DD SERVO ACTUATOR UR1E-070N UR1E 070...     FISHER ROSEMOUNT SERIAL INTERFACE COMMONX1-AA3 39A8571X...     FISHER ROSEMOUNT C1151DR2F12M1B1?C6 PRESSURE TRANSMITTER...     FISHER ROSEMOUNT C115GP6E22M1C6 PRESSURE TRANSMITTER 0 ...     Fukuda Denshi Co. 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