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...
tismemike Posted October 18, 2016 Share Posted October 18, 2016 1 Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted October 18, 2016 Share Posted October 18, 2016 On 17/10/2016 at 9:20 PM, norman said: Mine would be my fleshlight. 7 minutes ago, tismemike said: I vote Mikes post as marginally more useful.. 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...
PeterJames Posted October 18, 2016 Share Posted October 18, 2016 May as well go to work with a blindfold on if you dont have a meter in your hand. The amount of times Ive asked engineers what the voltage is, or what current is it drawing, and they havent looked! Quote Link to comment Share on other sites More sharing options...
lymebayalarms Posted October 18, 2016 Share Posted October 18, 2016 On 10/10/2016 at 10:24 PM, caveo security said: Thank you very much for your help Sir. So basically that means over extended distance voltage will drop is that correct ? Mr Caveo, just wondering what kit you fit intruder wise.... Quote Link to comment Share on other sites More sharing options...
al-yeti Posted October 18, 2016 Share Posted October 18, 2016 1 hour ago, PeterJames said: May as well go to work with a blindfold on if you dont have a meter in your hand. The amount of times Ive asked engineers what the voltage is, or what current is it drawing, and they havent looked! That's cos they left meter at pj Quote Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 19, 2016 Share Posted October 19, 2016 19 hours ago, PeterJames said: The amount of times Ive asked engineers what the voltage is, or what current is it drawing, and they havent looked! Swap it, book it, feck off, seems to be standard protocol... Quote Link to comment Share on other sites More sharing options...
AdrianMealing Posted October 19, 2016 Share Posted October 19, 2016 3 hours ago, sixwheeledbeast said: Swap it, book it, feck off, seems to be standard protocol... I'd agree, the fact that over 95% of our returns are no fault found backs this up. Been like it for years, every job I have had it's been pretty much the same. Quote amealing@texe.com Head of Industry Affairs Visit Our Website Texecom Link to comment Share on other sites More sharing options...
MrHappy Posted October 19, 2016 Share Posted October 19, 2016 3 minutes ago, AdrianMealing said: I'd agree, the fact that over 95% of our returns are no fault Many yrs ago I used to buy vertas r8's from my local branch of CEF. IIRC a good few % cheaper than CSD Professional (yes that long ago) They where going to stop stocking them as they had lots of returned items & could not understand why we never sent any back... They used to get Quote Mr Veritas God Link to comment Share on other sites More sharing options...
norman Posted October 19, 2016 Share Posted October 19, 2016 I'm in suspense Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
datadiffusion Posted October 19, 2016 Share Posted October 19, 2016 32 minutes ago, MrHappy said: Many yrs ago I used to buy vertas r8's from my local branch of CEF. IIRC a good few % cheaper than CSD Professional (yes that long ago) They where going to stop stocking them as they had lots of returned items & could not understand why we never sent any back... They used to get What? They used to get what!? Come back H the suspense is killing me!! 1 minute ago, norman said: I'm in suspenders Fixed. 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...
norman Posted October 19, 2016 Share Posted October 19, 2016 I've just popped a bit of the sticky stuff (Blu Tac) over the web cam...just in case. Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 19, 2016 Share Posted October 19, 2016 1 hour ago, AdrianMealing said: I'd agree, the fact that over 95% of our returns are no fault found backs this up. That wasn't exactly my point, but I understand where you are coming from. How can you prove that the supply and cable is ok before you bin the detector without your meter? You have to do your best to prove the equipment/cable after a F/A. Many seem to blindly swap it out and feck off. I'm sure I have mentioned before I have been to calls were three different engineers had been and swapped the same sensor after false alarms over a month period not even thinking to check for a cable fault. Look at it from both ways. If you don't find an obvious issue you are normally best to swap it. You will be back again, if there is an issue, but this time not earning anything. Quote Link to comment Share on other sites More sharing options...
AdrianMealing Posted October 19, 2016 Share Posted October 19, 2016 Agree with all that, one of the biggest issues over the last few years has been **** cable, it's been mentioned before but a lot of people don't know how to turn a meter on let alone use one. Poor quality cable causes all sorts of issues for many manufacturers, poor quality installations are usually blamed on the gear used, especially when in front of the punter. I've had to have a few quiet words with several company owners when their so called engineers have blamed our kit on their **** install and lack of knowledge. Does my head in when we get called to a site as the cause of the problem, only to find it's got feck all to do with us. Quote amealing@texe.com Head of Industry Affairs Visit Our Website Texecom Link to comment Share on other sites More sharing options...
MrHappy Posted October 19, 2016 Share Posted October 19, 2016 2 hours ago, MrHappy said: They used to get dunno, Quote Mr Veritas God Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 20, 2016 Share Posted October 20, 2016 7 hours ago, MrHappy said: dunno, That's made it worse... Quote Link to comment Share on other sites More sharing options...
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