| Electronics > Metrology |
| Inexpensive Calibration References |
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| krivx:
I've started to put together a collection of test-gear for hobby projects and electronics repair work (mostly audio). I currently have a Philips analog scope (PM3217) that is need of a calibration (visible difference in scale between the two channels) but I would prefer to avoid the cost and potential difficulty of finding a calibration house that can re-align it. Is there a cheaper and easier way to go about this? I was planning to buy a new multimeter soon, could I just get something like an Extech EX330, measure any DC voltage or oscillator and match the scope vertical gain and time-base to the Extech? Any recommendations for cheap used references available in Europe would also be much appreciated. Cheers. |
| mikeselectricstuff:
A scope is not a precision tool - a DMM and a crystal oscillator is more than adequate for basic calibration |
| krivx:
That's what I wanted to hear, thanks :) |
| Lightages:
Mike is right. An analog scope might be useable to 2% accuracy and I have yet to run into a multimeter worse than 1%. Having said that I can recommend these two sources for references should you need to check/calibrate something more accurately: http://www.voltagestandard.com/Home_Page.html I have the DMMCheck http://www.gellerlabs.com/Voltage%20References.htm I have the SVR They both have communicative owners and the quality of the product is good. I cannot vouch for the absolute accuracy of them but they seem to agree with each other which implies they are at least close to spec. They shipped to me on Chile so I imagine Europe would be no problem. |
| krivx:
--- Quote from: Lightages on January 19, 2012, 04:37:33 pm --- http://www.voltagestandard.com/Home_Page.html I have the DMMCheck http://www.gellerlabs.com/Voltage%20References.htm I have the SVR --- End quote --- These look great, I'll keep them in mind as I had also been looking at used and faulty multimeters. Funnily enough it looks like the calibration on the DMMCheck reference equipment expires today. |
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