Hi ! i am testing caps i have at hand with this meter
some caps rated 22mF measure around 17mF
i wonder if i can still use them without issues
Other NOS caps instead measure accordingly with their rating
Moreover i would like to understand if there is a cheap but reliable way to check the ESR
I have seen only a very expensive meter
Thank you all sincerely
some caps rated 22mF measure around 17mF
i wonder if i can still use them without issues
Other NOS caps instead measure accordingly with their rating
Moreover i would like to understand if there is a cheap but reliable way to check the ESR
I have seen only a very expensive meter
Thank you all sincerely
Try reforming the capacitor prior to measuring it. It will be better.
Apply rated DC voltage of proper polarity through a 10k 20W resistor.
If you have a lab variable DC supply, use that to gradually raise the DC voltage on the capacitor.
Cook at rated DC voltage for a hour or so.
Apply rated DC voltage of proper polarity through a 10k 20W resistor.
If you have a lab variable DC supply, use that to gradually raise the DC voltage on the capacitor.
Cook at rated DC voltage for a hour or so.
I've done that in the past.
Nowadays, I simply buy a replacement capacitor and cut out all the hassle. 🙂
Nowadays, I simply buy a replacement capacitor and cut out all the hassle. 🙂
I think you should avoid those caps which are reading less than the value written on them. Specially if you are working on an Amplifier.
Hi thank you very much I will look for a esr meter then
I bought them years ago and now i was thinking to use them to increase uF in a little amp
Better be safe than sorry
hi thank you sincerely If i get it right the resistor should be put in series with the capacitor ?
could i cook more caps in parallel ?
Keep in mind: Most manufacturers specify for +/- 20% in capacity when new. Try a bit of reforming, the minimum nominal value is not that far off. Also keep in mind - these 10,- meters are great, but very small and very large value are not accurately measured...
Everything reads above 0.3 Ohm ESR. I think you are reading the test lead resistance or the tester doesn't measure ESR accurately. What test frequency does the meter apply to the capacitor?
Regarding measuring 15000 on the 22000 capacitor, verify the tester is accurate before discarding the capacitor. It isn't easy to measure very large capacitance with these cheap digital meters.
Regarding measuring 15000 on the 22000 capacitor, verify the tester is accurate before discarding the capacitor. It isn't easy to measure very large capacitance with these cheap digital meters.
Hi thank you for your very valuable advice I have no clue really I bought this thing after seeing a video on Youtube and read some reviews
The goal is to check the actual quality of NOS and used parts Often i can find industrial parts like caps and transformers refurbished
They are parts that new cost a lot and are extremely well performing High grade parts
I see and thank you very much again
The measured capacitance is more or less the same that i read using the meter at the beginning of this thread Not much of a difference
Hi again ! i wonder if it is the same as this one
https://www.amazon.it/Evliery-Misuratore-Capacità-Condensatore-Professionale/dp/B0CVWY7NSF/ref=sr_1_9?__mk_it_IT=ÅMÅŽÕÑ&crid=1Q0UUWFZF55UT&dib=eyJ2IjoiMSJ9.zYJ4EEHU_wwStWOWbCXRlEPuxFxueEI65-Hi5RtXOZtimxL5xevukKYfoR5_xLYCzF0xTXGjxBrmzAJmKQoitTyjyu0QyTiH6Lo1IDMaDWQTh50toqfUfOmf2TCWSscYk8qnQMQQLA8cybdLCKzmn-jdnka0Iyu6OeVWv9qZV4jq90sUTF9QRE7mr436OuwF4-L0hfZR5wcAKX-xpv2LYVvzVDs7gCjEHM-Iejb9Cph5skTnEGFjJA6iFza5v0AwD6lKYmq36ntNauNeDyuAVJQqGuUn_45xzdeS4H9dqPI.xtgQ28azDPJ-Fmw9h7ccOZII5TaOO4vJ_F5TC6KkXgk&dib_tag=se&keywords=mf470+esr+meter&qid=1726066655&sprefix=mf470+esr+meter+,aps,162&sr=8-9
Evliery M6013 ESR meter
The one you pictured looks identical to the one I pictured.
I do one at a time. Otherwise, each capacitor should have its own separate 10k 20W resistor.
Of course, only do this if all of the capacitors have the same DC voltage ratings.
Hi again Thank you All for the very kind and helpful advice
I have just one last question
Can caps be checked when still mounted on the board?
I am interested also in old amps
Often caps are 30 or more years old
I would replace everyone just for safety
but it would be interesting to check them first anyway
I have just one last question
Can caps be checked when still mounted on the board?
I am interested also in old amps
Often caps are 30 or more years old
I would replace everyone just for safety
but it would be interesting to check them first anyway
It’s best to test components isolated and out of circuit since parallel paths can or will affect your measurements