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Forgive my lack of knowledge regarding IA's, but it appears as though they need a voltage supply to work, in the first case 18V? Is this correct?

melone: I don't have to use uninsulated wire. I originally thought it would be beninfical if I did because then resistances could be measured along the entire length of the wire (instead of just the ends) and a graph could then be drawn showing the linear nature of resistance. The problem is...

Oh, one other thing: the idea behind the 60cm board was to measure resistances at different lengths. We have another product utilizing the same board, with a pre-printed scale on it so the thought was to just combine the two and use the same board. This was before I actually carried out the...

zeusfaber: You're entirely correct. I'd just about given up on this thread since it has some esoteric solutions and seems to have gone off on tangents here and there. As I said, this is for kids. Young kids, maybe 6th - 8th grade or younger. It is only meant to show that different metals have...

I'm sorry, I didn't mean to offend anyone. Maybe a little deeper explanation regarding the use of this may be in order. I work for a company that manufactures basic science equipment for physics labs (and classes) anywhere from elementary school up to the college level. We specialize in the...

The wires are 60cm long. Yes, you're right, the copper and silver wires in the set will have very little measurable resistance, however some of the other materials seem to work well using this method(iron, constantan, Ni-Chrome, stainless steel). I can just use the low resistance wires (copper...

The series option didn't work. Not enough resistance. How valid would this be: Connect a D-Cell battery in series with a multimeter. Set DMM to measure amps. Put one lead on far side of power circuit. Measure amperage at short end, then at long end. There seems to be enough to measure when it...

@ Operahouse: Too complex and costly @ Sreid: I've thought of this, however since students will be using these themselves, I'm afraid they will break the wires. Maybe a possibility if I can somehow protect the wires. @ melone: I can't use big spools of wires because not all types of wires come...

First off, thanks for all the replies. Second: I'm not an electrical guy and this is going to be used to show students the different resistances of materials, theoretically by mounting short lengths of wires on a board. I need the simpler methods such as running a current across the wires or...

I have a project that I am working on that is used to show, very simply, the difference in resistance between different materials. I'm using wires of a relatively small diameter, however I'm seeing that the resistance is going to be so small that it will not be measureable using standard...

My VARs have been utterly useless to me for helping me solve this issue, so I hope someone here has some experience with this that can help: SW Explorer is finding nothing. I have a network drive that has all the drawings on that I have set up SW explorer to search through. I have removed all...

Thank you IRstuff. I get it now.

It's a 189 True-rms multimeter listed on their website here: http://us.fluke.com/usen/products/Fluke+187+189.htm?catalog_name=FlukeUnitedStates&category=HMA(FlukeProducts)

IRStuff: OMG, I am a frikin' tard. The 3 is a reference to a note below that states: Using relative mode (REL delta) to zero residual reading). I was stuck looking at it as engineering notation. This does not, however resolve everything as the specs seem to be conflicting. The book says 10 LSD...

On their website the accuracy is listed as: Accuracy ± (0.05%+2) The 2 means 2 LSD, so is it accurate to 0.1 ohm then since the range is listed as 500.00?

This is for a Fluke Multimeter. They state that its accuracy is supposed to be represented as: +/-([% of reading] + [number of least significant digits]) Isn't 10^3 = 10,000? I don't understand at all. Maybe it is a typo...

I'm going to pre-apologize for this question, as it's pretty simple: I have a multimeter that I'm trying to figure out what the accuracy is when measuring small values of ohms (.5-10ohms). The booklet for the meter states: Range:500.00ohms, Resolution: 0.01 ohms, Accuracy 0.05%+10^3 I don't...

A product that we receive from overseas has parts that are solid brass, however those parts are attracted to strong (neodymium) magnets. My research into brass and its properties is somewhat conflicting. The materials handbooks say that there's nothing in brass that will make it attract to...

Diskullman: Thanks for the suggestions, however these rollers have a fixed bore, they are not bearing rollers, but rather drive rollers. dimjim: Rotek doesn't appear to have what I'm looking for either, but thanks anyway. berkshire: These are the types of companies I was looking for the names...

The company I work for has a product that uses steel rollers which are hardened and chromed. The specifications called out for this roller are way overkill for our use (60 Rc, dia tolerance of .0005", etc) and the small quantity we use makes them costly to produce. What I'm wondering is...