Help with measureing mA at the tailcap

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trooplewis
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Help with measureing mA at the tailcap

I see a lot of folks giving readings of their XM-L's using a multi-meter.

For those of us with no prior electrical experience, would you mind maybe sharing some short instructions on how to do that?

Starting with correct placement of the leads into the MM?

I've only ever used my MM to check for continuity....

Thanks

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fishinfool
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Aloha Troop!  Here's a link that I've seen a lot of people reference to.  I know it's from the other place but they do have a lot of good information over there.  I hope this helps.

http://www.candlepowerforums.com/vb/showthread.php?236906-Simple-guide-to-using-a-DMM-for-measurements

 

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

Nautic
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And here is his webside with even more information, most in danish but also some english:

http://www.lygte-info.dk/

Cheap quality is good - Expensive crap isn´t

trooplewis
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Very nice, thank you!

Rats, finally sold my 2010 509hp Mustang...now I can buy more lights!

Sold the red one too! Now guess what I drive, doing my penance for 500 hp commuters...

http://dreammustang.com/

http://i884.photobucket.com/albums/ac47/Ha

trooplewis
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ALright, I tried this for the first time, it was hit-and-miss getting the correct settings on the DMM.

For my Manafont 3-mode XM-L drop-in in my Ultrafire 504, I got measurements of 1.8 to 2.0, roughly.

For my 2 XR-E drop-in (with 2xcr123) I got about .8 on each one.

 

AN XP-G I have measuered right at 1.0

 

Do those numbers sound about right?

 

Rats, finally sold my 2010 509hp Mustang...now I can buy more lights!

Sold the red one too! Now guess what I drive, doing my penance for 500 hp commuters...

http://dreammustang.com/

http://i884.photobucket.com/albums/ac47/Ha

Davx
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I don't have a huge experience but seems to be a little lower than expected. Consider also that battery and circuit board can influence the result.

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Haggai
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Anyone knows where to get the leads splitters (or their proper name) in the following picture?

http://www.lygte-info.dk/pic/measurement/DSC_1006.jpg

photon1k
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Just a guess here, but they may be Fluke accessory leads. They look very useful however, so if somone finds them at a good price I for one would like to know.

Don
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Haggai wrote:

Anyone knows where to get the leads splitters (or their proper name) in the following picture?

http://www.lygte-info.dk/pic/measurement/DSC_1006.jpg

 

Anywhere that sells 4mm banana plugs. If you want to buy ludicrously overpriced ones try a HiFi shop. Any education supplier selling science equipment will sell you them. They are called stacking leads.

You can get the plugs here but they are grossly overpriced. My usual supplier of such stuff has recently gone bankrupt unfortunately.

http://www.maplin.co.uk/stackable-4mm-plugs-1442

 

Or here

http://www.rapidonline.com/1/1/indexd18.html

 

Or here

http://www.rapidonline.com/1/1/7581-4mm-stackable-test-lead-retractable-...

 

Or here

http://intecmichael.en.made-in-china.com/product/YeyJfqprHBck/China-4mm-...

 

Any of the HK dealers ought to be able to get you these for very little money.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Piers
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Don wrote:
You can get the plugs here but they are grossly overpriced.

http://www.maplin.co.uk/stackable-4mm-plugs-1442

Most of mine are from Maplin as I used to have to pass it every day ont he way back from work Silly

It's a bit of a better deal if you buy the cables pre-made http://www.maplin.co.uk/4mm-patch-cord-1443

Most of my charger leads are made from those (and the red ones) cut in half and connected to suitable plugs or holders.

Haggai
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Thanks, Don and Piers, I think I'll buy some for more fun with my multimeters... Smile

Don
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Haggai wrote:

Thanks, Don and Piers, I think I'll buy some for more fun with my multimeters... Smile

 

They are amazingly useful. If you can't find them anywhere else, Maplin will ship them to you. At a (very high) price. When I lived in Zambia 30 years ago, Maplin would send me stuff (at a (high) price) that nobody else was interested in shipping to me.

 

If you can't find them in Israel, let me know and I'll get them at the best price I can and ship them to you at cost.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Haggai
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Thanks, but they're available from eBay at about 2$ for just 2 plugs or 6$ for a couple of wired plugs.

Also available here for a bit more.

But I think I'll have to find better multimeter probes first. Mine can't read more than 2A, although rated at 10A. Arrggh.

Piers
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They probably melt at 10A Silly