I have been told the best way no be sure of a Visually good capacitors true condition is to measure its ESR. However I am still confused as there doesn't seem to any specific value of this. Some manufacturers data sheets for capacitors don't even give the ESR rating of thier capacitors. For example (1)
I have here a Nichon 25v 220uf electro cap that according to my GM328R component tester has the following values: Impedance 228.4 ohms, vlos 2% and a ESR:0.40 ohms. As i cannot find any specs on what a acceptable ESR should be How do I know whether this is a good or bad cap. Example 2 is a nichon 4700uf 10v electro cap and it tests are: uf=5293 uf, vlos=1.9% ESR=0.16 ohms. Are these caps good or bad? Some caps I have measured have impedance in the fractions of a ohm while others can be many ohms. Is there a rule or baseline for knowing when a cap is in tolerance and a acceptable usable condition.
I have here a Nichon 25v 220uf electro cap that according to my GM328R component tester has the following values: Impedance 228.4 ohms, vlos 2% and a ESR:0.40 ohms. As i cannot find any specs on what a acceptable ESR should be How do I know whether this is a good or bad cap. Example 2 is a nichon 4700uf 10v electro cap and it tests are: uf=5293 uf, vlos=1.9% ESR=0.16 ohms. Are these caps good or bad? Some caps I have measured have impedance in the fractions of a ohm while others can be many ohms. Is there a rule or baseline for knowing when a cap is in tolerance and a acceptable usable condition.
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