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| Ceramic caps from China |
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| Discotech:
Some of the caps I've been testing today have been way out of tolerance 1nF = 1.4nF 4.7nF = 6.8nF 150pF = 100pF 100nF = 50nF 1.5nF = 2nF the other 70% of the bundle were within tolerance But I don't understand how these ones can be so far out they're in the next or previous band, is it an issue when the numbers are printed on them and they get the wrong ones printed ? Is this common with caps from China ? Better to buy from Farnell/Mouser if you want better accuracy I guess ? |
| homebrew:
What is the exact specification of the capacitors? How did you measure the capacitance? Generally speaking, I would ONLY buy from reliable sources anyway.That said, many reliable electronic parts are manufactured in China ... So rather your specific source than the country of origin would be the issue ... |
| Discotech:
--- Quote from: homebrew on August 17, 2018, 09:17:51 pm ---What is the exact specification of the capacitors? How did you measure the capacitance? Generally speaking, I would ONLY buy from reliable sources anyway.That said, many reliable electronic parts are manufactured in China ... So rather your specific source than the country of origin would be the issue ... --- End quote --- The numbers on left were supposed specified values, with the numbers on the right being what they were closer to Used both my DMM and GM328 Tester on the first few as I was thinking it was possibly mistaken calibration on the tester but when the DMM was showing pretty much identical values I figured it must be the caps that have incorrect numbers printed on them I'm not too fussed as they were cheap from aliexpress, it was like £1 for 300 and the majority were within spec but the ones out of spec were way out so I was wondering if it's a common issue ? |
| bson:
The tester may not have any accuracy to speak of at such small values. What is the dielectric class and voltage rating? Maybe they're derated for a higher voltage than the tester uses. |
| floobydust:
I too find the cheapola cap values are all over the place. Expensive parts are all about -15% and vanilla parts are +/-30% of rated value. |
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