| Electronics > Projects, Designs, and Technical Stuff |
| 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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