Starting a Data Acquisition with an External Digital Trigger Pulse Using a PC-LPM-16 or a DAQCard-700Hardware: Legacy DAQ Devices>>Multifunction DAQ>>DAQCard-700
Problem: How can I start a data acquisition with an external digital trigger pulse using a PC-LPM-16 or DAQCard-700? Solution: The only way to start a data acquisition sequence with an external digital trigger pulse is to use the trigger pulse to gate a square wave generating counter, and put the square wave output into the EXTCONV* input of the device. The counters on the device cannot be gated on a pulse because they only have either high- or low-level gating, so you must use some external circuitry to change the pulse to a high- or low-level TTL signal. You also can use a flip flop, which changes the state of its output with each rising edge on the CLK input, thus converting two pulses into a level gate signal. Related Links: Product Manuals: PC-LPM-16/PnP User Manual Product Manuals: DAQCard-700 User Manual KnowledgeBase 02R8O18Q: Implementation of a Digital Trigger on DAQCard-700 Attachments:
Report Date: 01/16/1996 Last Updated: 10/22/2004 Document ID: 0HFA11IE |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
