shunt resistor - Electronic Circuits Projects Diagrams Free

wegdan · 10th April 2006, 08:40 AM

hi
please i need to ask about shunt resistor 100Mv, 10 Amp which has 4 ends (can be connected to 4 things at the same time), or any alternatives can be used.

**Nigel Goodwin** · 10th April 2006, 09:00 AM

It's simply a low value resistor, two of the contacts are where it's connected in circuit, the other two are for the connection to the meter - the meter connections simply connect to the other ones, but accurately, to prevent errors when you're dealing with such a low resistance.

wegdan · 12th April 2006, 06:22 PM

Quote:

Originally Posted by Nigel Goodwin

It's simply a low value resistor, two of the contacts are where it's connected in circuit, the other two are for the connection to the meter - the meter connections simply connect to the other ones, but accurately, to prevent errors when you're dealing with such a low resistance.

how can i make one of these shunt resistors as i search for it but it is not available

Papabravo · 12th April 2006, 07:58 PM

Use a spool of wire. Start with 100'. If too much, cut some off. If too little, add another spool. Get the idea?

**Nigel Goodwin** · 12th April 2006, 09:35 PM

Quote:

Originally Posted by Papabravo

Use a spool of wire. Start with 100'. If too much, cut some off. If too little, add another spool. Get the idea?

100 feet sounds a little excessive :lol:

Use resistance wire, you only need short lengths then!.

zevon8 · 12th April 2006, 10:01 PM

For a 10 Amp shunt you could always buy a cheap multimeter, and use the shunt in it, which is likely just a small section of resistance wire. It would not likely be good for high accuracy or steady use, but for the price of a cheap meter you get some other parts that may be useful also. Probably costs less than a small order online from a parts supplier.

If you wanted to, you could always write any of the resistance wire wakers and ask for a small sample, many would ship you a 1 foot piece for prepaid postage. Be polite, say its for a school project, or something like that. ( I have done this before, and they actually sent me a whole bunch of small samples )

I have no idea where you are located in the world, ( don't get Nigel started on that

) but there are hundreds of manufactures, one is here:

http://www.resistancewires.co.uk/products_RW45.html

stevez · 12th April 2006, 11:57 PM

Take a look at wire charts and look for two things --

The ohms per foot, per hundred feet, per meter ..whatever unit you have.

The current carrying capacity.

Pick the smallest wire that will handle the current - maybe one size smaller. Calculate the number of feet you'll need to get a 100 mv drop with 10 amps flowing. I've made shunts in this range with this crude method and it doesn't take all that much wire. Coil it up ..and keep it away from anything it case it has to cool itself.

Russlk · 13th April 2006, 12:55 AM

Caddock makes the resistor you are looking for. They have 1 watt and 2 watt models. They are in the Digi-Key catalog (www.digikey.com), part number for the 1 watt : 684-SR10-0.01. Cost is $3.90 US.

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10th April 2006, 08:40 AM	(permalink)
wegdan	shunt resistor hi please i need to ask about shunt resistor 100Mv, 10 Amp which has 4 ends (can be connected to 4 things at the same time), or any alternatives can be used.

10th April 2006, 09:00 AM	(permalink)
Nigel Goodwin	It's simply a low value resistor, two of the contacts are where it's connected in circuit, the other two are for the connection to the meter - the meter connections simply connect to the other ones, but accurately, to prevent errors when you're dealing with such a low resistance. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

12th April 2006, 07:58 PM	(permalink)
Papabravo	Use a spool of wire. Start with 100'. If too much, cut some off. If too little, add another spool. Get the idea?

12th April 2006, 10:01 PM	(permalink)
zevon8	For a 10 Amp shunt you could always buy a cheap multimeter, and use the shunt in it, which is likely just a small section of resistance wire. It would not likely be good for high accuracy or steady use, but for the price of a cheap meter you get some other parts that may be useful also. Probably costs less than a small order online from a parts supplier. If you wanted to, you could always write any of the resistance wire wakers and ask for a small sample, many would ship you a 1 foot piece for prepaid postage. Be polite, say its for a school project, or something like that. ( I have done this before, and they actually sent me a whole bunch of small samples ) I have no idea where you are located in the world, ( don't get Nigel started on that ) but there are hundreds of manufactures, one is here: http://www.resistancewires.co.uk/products_RW45.html

12th April 2006, 11:57 PM	(permalink)
stevez	Take a look at wire charts and look for two things -- The ohms per foot, per hundred feet, per meter ..whatever unit you have. The current carrying capacity. Pick the smallest wire that will handle the current - maybe one size smaller. Calculate the number of feet you'll need to get a 100 mv drop with 10 amps flowing. I've made shunts in this range with this crude method and it doesn't take all that much wire. Coil it up ..and keep it away from anything it case it has to cool itself. __________________ stevez

13th April 2006, 12:55 AM	(permalink)
Russlk	Caddock makes the resistor you are looking for. They have 1 watt and 2 watt models. They are in the Digi-Key catalog (www.digikey.com), part number for the 1 watt : 684-SR10-0.01. Cost is $3.90 US. __________________ see my website: www.geocities.com/russlk