a1steve Posted March 29, 2007 Posted March 29, 2007 Hi Please can any one tell me wot is the best resistor to get for alarm panels with the w and %? I am a bit confussed with the 0.125W 5% wot does all this meen? RESISTOR, CF 0.125W 5% 1K Resistor element type:Carbon Film Case style:Axial Resistance:1kR Tolerance, +:5% Tolerance, -:5% Temp. coeff, -:700ppm/
luggsey Posted March 29, 2007 Posted March 29, 2007 Hi Please can any one tell me wot is the best resistor to get for alarm panels with the w and %? I am a bit confussed with the 0.125W 5% wot does all this meen? RESISTOR, CF 0.125W 5% 1K Resistor element type:Carbon Film Case style:Axial Resistance:1kR Tolerance, +:5% Tolerance, -:5% Temp. coeff, -:700ppm/ ----------------------------------------------------------------------------------------------------------------------------------- Life is like a box of chocolates, some bugger always gets the nice ones! My Amateur Radio Forum
Service Engineer Posted March 29, 2007 Posted March 29, 2007 0.125W 5% wot does all this mean? 0.125W is the heat it can safely dissipate. 5% is the tolerance of the resistor eg: 1K = 950 to 1050 ........................................................ Dave Partridge (Romec Service Engineer)
a1steve Posted March 29, 2007 Author Posted March 29, 2007 I think you need to refrence the alarm engineers book to find the correct value and size, they normally come with resistors?Failing that contact the manafactuer and ask them which values are required. Can't help more then that without more info? I know i need 1k resistors but wot does all the other info w and % mean
camerabloke Posted March 29, 2007 Posted March 29, 2007 it means what it says in the post above your last post Eucam Security Systems 0845 4630 746 www.eucam.co.uk
luggsey Posted March 29, 2007 Posted March 29, 2007 I know i need 1k resistors but wot does all the other info w and % mean W is for watts of power the resistor can handle without overheating and going pop, the % is the tollarence of the value, ie. 5% will be within 5% of 1000 (1k) ok? ----------------------------------------------------------------------------------------------------------------------------------- Life is like a box of chocolates, some bugger always gets the nice ones! My Amateur Radio Forum
arfur mo Posted March 29, 2007 Posted March 29, 2007 tbh you are worrying yourself into an early grave for no reason. the power passed through resistors used for termination and bypassing contacts on security systems is very small, so well within even the smallest type of carbon resistors capability to handle. the important factors are the resistive value and the error tollerance usually +/- 5% (siver band) of stated value. you can get closer tollerence (+/- 2% have a gold band) and not really needed, wider tollerance (+/-20% brown band) which should be avoided. carbon bodied are the most popular, but other materials are also used like ceramic, wire wound are used to handle higher currents if required but are bigger in case size. regs alan If you think education is difficult, try being stupid!!!!
whistle Posted March 29, 2007 Posted March 29, 2007 LOL you worry to much. I once fitted 4 x 1k and a 680 ohm in a mosaic to make 4k7 temp on a call out as i had no 4k7 with me that night. Booked it in for a revisit. about a year later i went back to do a RM and found it still the same. LOL I put it right in the RM. I have also used 2 x 1k on a scantronic temp in place of the 2k2 and it worked ok aswell.
mjw Posted March 31, 2007 Posted March 31, 2007 LOL you worry to much.I once fitted 4 x 1k and a 680 ohm in a mosaic to make 4k7 temp on a call out as i had no 4k7 with me that night. Booked it in for a revisit. about a year later i went back to do a RM and found it still the same. LOL I put it right in the RM. I have also used 2 x 1k on a scantronic temp in place of the 2k2 and it worked ok aswell. Would that be in series or parrallel then???????
Guest anguscanplay Posted March 31, 2007 Posted March 31, 2007 often fit them the other way to get 12v down to 9v for radio transmitters dont be worrying its only a resistor
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