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Home made DMM accuracy check - calibration ..

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Kiriakos-GR:
I have to point out one amazing for my taste link ..

Tips about basic test and calibration tools .

http://lategahn.2log.de/index.php?calibration-standards-introduction

I got very excited , and ordered all ready the parts for the DC calibrator .
Found the major chip in Germany , and I have just buy it ..

Now I am looking for resistors ...  ;)

DJPhil:
Good find!

I bookmarked that one for future reference. Thanks for the heads up. :D

Kiriakos-GR:
You are welcome ...  ;)  

Now I am looking for Military Film metal resistors ..
And I do have locate my ebay source ...

But I do have one question .. is at the film metal resistors .. quality issues ?

I find easily  offers of  30 or 50 resistors of your choice for few dollars.
And I am ready to trust more the  VISHAY brand , than  no-name ones.

Are any better brands than this ?

saturation:
Be careful about buying parts off eBay or unknown distributors especially based in China, there are a lot of counterfeit electronic parts.






--- Quote from: Kiriakos-GR on July 08, 2010, 06:55:01 am ---You are welcome ...  ;) 

Now I am looking for Military Film metal resistors ..
And I do have locate my ebay source ...

But I do have one question .. is at the film metal resistors .. quality issues ?

I find easily  offers of  30 or 50 resistors of your choice for few dollars.
And I am ready to trust more the  VISHAY brand , than  no-name ones.

Are any better brands than this ?



--- End quote ---

rf-loop:

--- Quote from: Kiriakos-GR on July 08, 2010, 06:55:01 am ---

Are any better brands than this ?



--- End quote ---

Vishay is good but can not forget Caddock for precision resistors
http://www.caddock.com/

But Vishay VHP100 series reistors are good (low TC and low ageing)
http://www.datasheetcatalog.org/datasheet/vishay/vhp100.pdf

maybe using with cheap 0,02 - 0,05% Voltage reference these are littlebit overkill, but not if try make true lab grade references. (but it is totally different case)  ;)


-----------------------------------

Maybe Vishay have not yet move manufacturing to China... (but many many highly trusted brands are... maybe also we can soon wait Chinese most high brands.

Counterfeits... some times (some special) counterfeits are also better than originals.. sometimes value is as waste.

btw many chinese ebay etc sellers get components and equipments also from western countries factories production lines... (u want one surplus/waste container or do you want 100. Opening these waste containers may be very "eyes opening surprice")

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