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Community Bench Meter
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badSCR:

--- Quote from: Mastro Gippo on January 31, 2010, 12:41:11 pm ---...
Dave, can you take some pictures of the analog frontend boards of your most expensive multimeters? Only board layout can be copyrighted, schematics can't, so if we can get a ready to go schematics we can design a slightly different board and have a product as good as the cool guys, for the price of bare components.
...

--- End quote ---


here are some schematics that we could get some ideas from.  (That were free)

http://cp.literature.agilent.com/litweb/pdf/34401-90013.pdf      Agilent 34401A Multimeter

http://cp.literature.agilent.com/litweb/pdf/34420-90010.pdf      Agilent 34420A   NanoVolt / Micro Ohm Meter

http://oldradio.tesla.hu/rajzok/muszerek/fluke45.pdf                Fluke 45

http://www.testequipmentdepot.com/fluke/pdf/77iii.pdf            Fluke 77 Series iii  Handheld meter

http://cp.literature.agilent.com/litweb/pdf/33120-90017.pdf       Agilent 33250A 15Mhz Waveform Generator




If you don't mind downloading multiple files and using WinRAR then:  (don't change the file names)

http://www.eserviceinfo.com/downloadsm/40126/Protek_6502A.html    Protek 6502A 20-40-60Mhz  Oscope

http://www.eserviceinfo.com/downloadsm/37608/Tektronics_465m.html   Tek_465M  Oscope

http://www.eserviceinfo.com/downloadsm/37182/Agilent_33120a.html     Agilent 33120  Function Generator

http://www.eserviceinfo.com/downloadsm/37180/Agilent_E3647/48A.html    60Watt Power Supply



http://www.eserviceinfo.com/browse.php   I just been looking for what has "schematics" in the file name.

Mastro Gippo:
I guess we're all busy reading the docs posted by badSCR..  ;D
jklasdf:
In the interest of moving things along -- while I'm sure everyone has their own opinion on what their favorite case/microcontroller -- I think most people here would agree that it's more productive to choose *something* even if its not their first choice, rather than sitting around arguing.

So I propose a vote (choose only one option):
1.) PIC
2.) AVR/Arduino
3.) ARM

For the case, I haven't seen many objection to the case proposed by Dave, http://www.polycase.com/category/zn-series.html. I definitely think that a benchtop case is a good idea for a do-it-yourself kind of a project, even though handheld might be more convenient with a production unit.
Valhallasmith:
What about ignoring processor and just making SPI or I2C modules that make up various instruments.  There are various items that most instruments need and people could stitch them together whatever way they need.

For example a DC volt meter would need a relatively noise free A/D.  It would also need a precision reference, a switch MUX of some kind, a PGA, a voltage divider network, an analog power supply and a digital power supply.  Most of these are basic items that any instrument could need.

If you were making an AC volt meter you would also need a True RMS converter or precision bridge.  Virtual instruments made up of these sorts of components would be an interesting way to take things.  Volt meters, power meters, LCR, etc could all be built from various components.  People could add various modules to their box depending on what they want to do.  Not everyone needs 6.5 digits of accuracy, so they could get a cheaper A/D unit and a noisier PGA.  Since everything is a virtual instrument various items can just be plugged into a switch matrix.

Could be a bit large of a project though.
charliex:
Most of the open source projects fail because of fragmentation , general disagreement and usually biting off more than can be chewed.

Simple and modular sounds good to me. its pretty easy to revise hardware these days, costs are much lower.
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