caveo security Posted October 10, 2016 Share Posted October 10, 2016 The power supply unit (PSU) carries out a number of tasks. a) What is the actual value of the regulated supply voltage that it provides to the system? b) What would be the influence on that voltage at the detection devices that are powered by that supply if the detectors were to be installed at an extended distance from the control equipment? Quote Link to comment Share on other sites More sharing options...
james.wilson Posted October 10, 2016 Share Posted October 10, 2016 a. Ideally 13.69 but that is now 13.75 as most diag cant hit that resolution b. Ohms law depends on the resistance and the distance. Resistivity is what matters. If the course is up to date id assume you discussed copper vs cca 1 Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
caveo security Posted October 10, 2016 Author Share Posted October 10, 2016 (edited) Thank you very much for your help Sir. So basically that means over extended distance voltage will drop is that correct ? Edited October 10, 2016 by caveo security Quote Link to comment Share on other sites More sharing options...
james.wilson Posted October 10, 2016 Share Posted October 10, 2016 yes it will. The more current you pull the more the volts will drop. No current = no vd. If you pull a load then you need to think about it Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
al-yeti Posted October 12, 2016 Share Posted October 12, 2016 Why don't you do basic electronics course first? It will teach you this stuff Then house bash dot com Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted October 12, 2016 Share Posted October 12, 2016 https://www.amazon.co.uk/gp/offer-listing/0860208095/ref=tmm_pap_used_olp_sr?ie=UTF8&condition=used&qid=1476265557&sr=1-1 I'm not joking OP - if you are struggling now you'll thank me later Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
WDT Posted October 17, 2016 Share Posted October 17, 2016 When I did my course, i did it on site and one thing that come up was that maybe everyone should do the basic/ohms law course first. I think it was being put forward as a suggestion. Quote Link to comment Share on other sites More sharing options...
norman Posted October 17, 2016 Share Posted October 17, 2016 My experience is that the majority (maybe being a bit unfair, but certainly a lot) of engineers don't know how to use their multimeter effectively. Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
WDT Posted October 17, 2016 Share Posted October 17, 2016 3 hours ago, norman said: My experience is that the majority (maybe being a bit unfair, but certainly a lot) of engineers don't know how to use their multimeter effectively. Next your be telling me it's not a door stop, I did a access course at Tavcom and the guy i was paired with seemed keen to guess the fault that was put on the test rig rather then using his meter, I like using a meter do the tests look at what you have. Then you can make a correct diagnosis. If someone asked me what tool i could not be without it would be my meter, Quote Link to comment Share on other sites More sharing options...
norman Posted October 17, 2016 Share Posted October 17, 2016 Mine would be my fleshlight. Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
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