Products > Test Equipment
Incorrect values in 0.1uf capacitor measurement
indman:
--- Quote from: TA3UIS on December 02, 2024, 08:49:21 am ---Yes, they are all the same brand and were purchased from a single supplier. Do you think the 0.1uf capacitors are defective?
--- End quote ---
Yes, these capacitors are of poor quality. Look at the pictures I took of similar specimens.
In your photos, in addition to the wrong capacitance, these capacitors have a very high loss factor D, which is 10 times the same parameter of a serviceable one.
TA3UIS:
The 0.1uf capacitors I have are also from the same brand. The ones I have are garbage...
SeanB:
Chengx, a clone of the Chongx capacitors, which are a poor clone of pretty much any other of a million other manufacturers. If you need to buy sub 1 uF capacitors do not ever buy electrolytics, instead buy polyester or polypropylene. Pretty much any film capacitor will be better in all respects other than size, and stay away from ceramic capacitors as well, unless you get NPO types, the standard and common X7R types have both a massive tolerance variation, plus also aregoing to change capacitance with voltage applied across them as well.
But those ones apply close to rated voltage (you can put them all in parallel to do so) via a 10k resistor, so as to limit current, and also measure leakage, and leave them powered up for 48 hours to reform, and you will see a big change, though these cheap and nasty capacitors are best tossed and replaced with decent brand name types, like Nichicon, Vishay or Matsushita, though you will pay a premium for them, but they will last a long time in service, and have good performance.
TA3UIS:
The ones I have are Cheng brand. I think they are the trash of trash
wraper:
--- Quote from: SeanB on December 02, 2024, 12:26:39 pm ---Chengx, a clone of the Chongx capacitors, which are a poor clone of pretty much any other of a million other manufacturers.
--- End quote ---
The original is Chang (Changzhou Huawei Electronics, funded in 1987), the rest are knockoff brands of it. ChengX (Chengxing Electronic) eventually grew up into a quite large company (probably larger than Chang) with proper product range and datasheets, the rest are still one hung low shops, including Chongx. One on the photo is Cheng with no X.
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