因维斯 3502E

 因维斯 3502E   因维斯 3502E  因维斯 3502E  
外触发使用外加信号作为触发信号，外加信号从外触发输入端输入。外触发信号与被测信号间应具有周期性的关系。由于被测信号没有用作触发信号，所以何时开始扫描与被测信号无关。 　　正确选择触发信号对波形显示的稳定、清晰有很大关系。例如在数字电路的测量中，对一个简单的周期信号而言，选择内触发可能好一些，而对于一个具有复杂周期的信号，且存在一个与它有周期关系的信号时，选用外触发可能更好。
　　2．触发耦合(Coupling)方式选择 　　触发信号到触发电路的耦合方式有多种，目的是为了触发信号的稳定、可靠。这里介绍常用的几种。 　　AC耦合又称电容耦合。它只允许用触发信号的交流分量触发，触发信号的直流分量被隔断。通常在不考虑DC分量时使用这种耦合方式，以形成稳定触发。但是如果触发信号的频率小于10Hz，会造成触发困难。 　　直流耦合(DC)不隔断触发信号的直流分量。当触发信号的频率较低或者触发信号的占空比很大时，使用直流耦合较好。 　　低频抑制(LFR)触发时触发信号经过高通滤波器加到触发电路，触发信号的低频成分被抑制；高频抑制(HFR)触发时，触发信号通过低通滤波器加到触发电路，触发信号的高频成分被抑制。此外还有用于电视维修的电视同步(TV)触发。这些触发耦合方式各有自己的适用范围，需在使用中去体会。 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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