shvetsov Posted February 10, 2009 Share Posted February 10, 2009 I would like to measure the revolutions per minute of an engine on a test rig. All vital signs will be data logged and displayed in a DAQFactory screen as well as ordinary analogue gauges in case of computer failure (there is a lot of vibration!). Currently the analogue rev counter is a Faria Tachometer that uses the pulses from an alternator to drive it. Brcause the engine does not have an alternator, Faria make a signal generator that can be driven by the engine taking the place of the alternator signal. The signal generator has two wires either of which can be the signal and earth, the generator runs at half engine speed and gives approximately 8 pulses per one engine revolution. I do not know what form the pulses take as I do not have an oscilloscope. The engine is a low revving one with maximum revs of 2,600 per minute. The revolution display will not be transitory because the engine will spend some time in each rev' band so the counter display does not need to refresh any more often than once a second. All I really need to know is what rpm the engine is doing. The system is a LabJack UE9 Pro with another board with loads more connections plugged into the side with CB37 printed on it. I am currently running eight TypeJ thermocouples plugged into the AI side of the CB37 board. I am a total novice to this and it has taken me some time and advice from yourselves and your excellent forum to get the thermocouples working but this rev counter has defeated me totally. I am embarrassed to say that most of the application guides etc are far too technical for me to understand. I desperately need some help with this - I think it must be really simple to solve but I am such a newbie to this I need telling where to put the wires even. I have seen other posts on this subject and tried to apply the method to my application but nothing happened! Probably because I didn't put the wires in the right place. I would really like to understand what I am doing but I need a result as my boss is getting annoyed with me for taking so long! The quicker you can post, the more likely I can keep my job! I love DAQ Factory by the way, I just wish I knew what I was doing! Link to comment Share on other sites More sharing options...
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