I need a 0.48 ohm resistor for a Micronta multi-meter. Mouser has 0.47 and 0.5 ohm but no 0.48. Does anyone know of a source?
Thanks,
Ron
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Need 0.48 ohm resistor
I need a 0.48 ohm resistor for a Micronta multi-meter. Mouser has 0.47 and 0.5 ohm but no 0.48. Does anyone know of a source?
Thanks,
Ron
hi Ron,Originally Posted by ronhollenbeck
Do they have any 0.01R's, these are a standard value.
If you have the space use a 0.47R and 0.01R in series, it sounds like a current shunt so consider the wattage.
Eric " Good enough is Perfect "
I will NOT answer PM's requesting technical help, please use the Forum
PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/
You could use a 0.51R and a 8.2R in parallel.
I found those values using this resistor calculator:
http://focus.ti.com/docs/toolsw/fold...elrescalc.html
First off, why do you want a 0.48 ohm?, it's a really strange value - next, how accurate does it have to be? - both 0.47 and 0.5 are within 5%, which is probably as good a tolerance as you're going to get.
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
He wants the 0.48Ω resistor for the same reason I do. I accidentally overloaded the 500 mA ammeter portion of my Micronta VOM this evening. This shunt resistor turned to crispy charcoal bits in about 3 seconds.
The closest I could find was here:
www . surplussales . com / Resistors / WireWound / WW0015-1 . html
They have a 0.47Ω 1% 0.5W
and a 0.487Ω 1% 20W (pretty darn close -- but with that power rating will be physically too big).
Our power is only .12 W so 0.5 W should be enough.
Jim C.
PS - board posting restrictions prevent me from posting proper URL. You guys will have to cut/paste and knock out all the spaces.
Just a thought:
2,4 / 5 = 0,48
on1aag.
You will not find a 0.48Ω resistor because it isn't a standard value, use 0.47Ω which is within 2% of the value.
The nearest standard value is 0.481Ω which is a 0.5% tollerance resistor and I doubt you can get such resistors as low as that.
http://en.wikipedia.org/wiki/Preferr..._and_resistors
Last edited by Hero999; 23rd September 2008 at 05:04 PM.
I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.
Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.
Are you sure.?
http://www.rhopointcomponents.com/pr...L+7520W+Series
Eric " Good enough is Perfect "
I will NOT answer PM's requesting technical help, please use the Forum
PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/
Any of these suitable.?
http://www.rhopointcomponents.com/pr...gory=RESISTORS
Eric " Good enough is Perfect "
I will NOT answer PM's requesting technical help, please use the Forum
PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/
I meant 0.48Ω, it was a typo as you probably know. I've edited my post.
I was wrong about the tolerance though, it looks like you can get low value resistors this good, still no 0.48Ω though.
Last edited by Hero999; 23rd September 2008 at 05:09 PM.
I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.
Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.
#30 AWG is 10'/Ω but it has a high tempco for this app.. It also doubles as a fuse.
I'd suggest you to put in a 0.51 ohm (or two one ohm resistors in parallel) resistor in your VOM and then connect your VOM in series with a known good ammeter to check it's calibration. With a 0.51 ohmmer, you WILL get a too sensitive ammeter with your VOM. You'll have to add another resistor in parallel (PICasm suggests 8.2 ohms, try 8.2, 9.1 and 7.5 ohms) to fine-tune your VOM.
Last edited by Valence_4; 15th October 2008 at 01:46 AM.
Thanks for the suggestion. I'll do that.
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