Trigger and Data Acquisition

The trigger and data acquisition system comprises three Levels (see Figure 7.1). Level 1 digitizes signals, buffers them, and makes initial trigger decisions. These trigger decisions... 

A. Lankford Triggering and Data Acquisition at a B Factory (At First Glance) Jan 16,1990... 

Identification of the Threshold of Stability The threshold of stability is generally identified by the width of cut (measured in the centre of the arc of contact) at which the vibration amplitude at the chatter frequency commences to build up. This is an inaccurate and unsatisfactory criterion. Therefore the procedure adopted was as follows. When the vibration motion reached a certain level Wi times the noise in the lines, 15 mV) the A/D converter automatically triggered and data acquisition commenced, covering the table feed motion (proportional to the width of cut), the vibration signal, the instantaneous power consumption, and the speed of rotation. These signals were stored digitally on a disk samples of them at intervals of 2 s were analysed and plotted. 

Digital input/output terminals are the basis for cooperation of sensor and data acquisition cards. A typical process of cooperation is to start the measurement of an external instrument by a digital trigger puke from... 

The analyzer automatically moves the filters that designate the lower and upper limits of each narrowband window to correspond with the actual running speed at the time the data are collected. To activate this function, the technician must either manually enter the running speed or use a tachometer input to trigger data acquisition. 

Programming — The third controller is programmed to trigger both LC systems, the start of MS data acquisition, and the direction of the column selecting valve. 

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