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Author Topic: DIY test tweezers for SMD  (Read 4422 times)
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Tornado
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« on: January 21, 2011, 01:38:44 01:38 »

Just found this and thought it was pretty cool:
http://poeth.com/SMD.htm

It's simple, cheap, and effective.
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pushycat
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« Reply #1 on: January 22, 2011, 07:01:24 07:01 »

Just saw the site and the Photo in. Practically it will give eratic results when capacitors or high value resistors are tested as shown in the photo. Note the two flanges of the test tweezers are touched by the user which are actually the probles and external resistances or capacitances will play a different role. One can try isolating the tweezers from the users hand by using some sort of heat shrink tubes applied over the conducting areas except the tips. Anyways a good idea of using the existing multimeter to test smd's.
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borberk
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« Reply #2 on: January 22, 2011, 08:53:12 08:53 »

Tweezers are made of single sided PCB thus electrodes are insulated from operators hand.
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forter
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« Reply #3 on: January 25, 2011, 10:12:12 10:12 »

I have made similar device.
But it works not good, because a capacity depends on gap between PCB materials.
This gap depends on jf type SMD devices (0805, 1206 and so on).
Especially the error is huge when a small C are measuring.

 

Posted on: January 25, 2011, 10:05:42 10:05 - Automerged

And little more...
The result of measure depends on the point where you touch the plate.
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borberk
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« Reply #4 on: January 25, 2011, 10:22:02 10:22 »

Instrument must be calibrated together with the probe before taking measurement of small capacitances.
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bbarney
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« Reply #5 on: January 25, 2011, 03:18:41 15:18 »

This would make a good Design challenge for Sonsivri members just to see what you guy's can think up ,even designing a pic or avr unit to read tweezers
here is another version from Maxim

http://www.maxim-ic.com/app-notes/index.mvp/id/4459
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kayvee
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« Reply #6 on: January 25, 2011, 03:53:58 15:53 »

Or, if you have some cash left in your R&D budget, you could just go buy one of these:

http://www.advancedevices.com/products_tw.htm

and save the time for your pet project  Cheesy
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bbarney
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« Reply #7 on: January 25, 2011, 05:24:16 17:24 »

That's the idea only make a unit that people here could use and make , most people here can't afford to buy such a luxury item Cheesy
personally I don't do much with smd , there are lot's of pic controlled L & C meters out there you just have to throw in the resistance part
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« Reply #8 on: January 25, 2011, 05:51:02 17:51 »

Or, if you have some cash left in your R&D budget, you could just go buy one of these:

http://www.advancedevices.com/products_tw.htm

and save the time for your pet project  Cheesy

Here's a link to a teardown of this product:

EEVblog #81 Smart Tweezers LCR Meter Review And Teardown
http://www.eevblog.com/2010/04/25/eevblog-81-smart-tweezers-lcr-meter-review-and-teardown/

A DIY version would be a great project.
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kayvee
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« Reply #9 on: January 26, 2011, 10:36:15 10:36 »

That's the idea only make a unit that people here could use and make , most people here can't afford to buy such a luxury item Cheesy


True, but was just pointing out that there are options at the other end of the scale too, for those unaware.  Who knows, could also help inspire compeditors to give us more options. Wink

Just love eeblog.com  Smiley
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OlDrunk
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« Reply #10 on: February 18, 2011, 09:45:29 09:45 »

Just a suggestion if you haven't seen this already but the superprobe project http://members.cox.net/berniekm/super.html
This is the kind of thing your talking about?
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trampe
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« Reply #11 on: March 18, 2011, 09:11:49 21:11 »

Something like this?
http://www.dealextreme.com/p/tl-06-smd-precise-circuit-and-micro-electronics-tester-probe-15162

Price: $8.20 and free shipping.

Trampe
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