Thank you for this video, its one of the best I've come across on the topic of testing capacitors. You have many factors to consider when testing capacitors. First is visual inspection, second is capacitance value, third is ESR, fourth is dissipation factor, and fifth is phase angle. All while remembering to use the correct measuring frequency. I have a good grasp of these except for dissipation factor. I don't typically have access to data sheets for older electronics and don't have a chart of common values like I do with ESR values.
You're welcome. Using ESR-I mean the third step - 95% of the time, you can spot the bad cap, because I experienced branded caps sometimes do not fall in capacitance. This is 100% of bad electrolytic capacitors. those 5% are for non-electrolytic ones.
Do you ever see lower ESR than expected and would this mean the capacitor is bad? I have a 50V 22uF through-hole electrolytic capacitor that I suspected may be bad on a power supply. Using the Aideepen LCR-TC1 component tester I measure 24uF and 0.47 ohm ESR. Using an online chart I think the ESR should be like 10x that, but maybe I'm mistaken. I had pulled this one because it appeared to not have continuity to GND on the board and I heard that was one way to test for bad caps.
in one case you read very low ESR and that's when the capacitor is shorted, which happens mostly for ceramic SMD ones. But in your case when the capacitance is okay, I am suspicious about your LCR (if it's a brand or a DIY) and the measurement frequency (use either 100Hz or 120Hz if your LCR meter is one of these, for the electrolytic-type capacitor is above 10uF). take the capacitor out of the circuit and test it again, it might be a resistor or an inductor in parallel.
@@MyVanitar The capacitor was already taken out of the circuit. I didn't make the meter myself but it is a cheap (under $30) meter from Amazon. I just recently got the LCR and this was the first thing I tried with it, so if it's not accurate, I'm not sure. I can't set the frequency myself, it's pretty much automatic, you stick the part in and hit a button and it does some things to detect what the part is and display info.
@@MyVanitar That makes sense, so it's probably not using the ideal frequency for this capacitor so it looks weird. Thank you. I don't have any known bad caps around to test but I am trying to find bad caps on this board so I guess I'll pull and test some more and see how they look.
usually, the frequency of such devices is fixed at 100KHz, used by many manufacturers and datasheets to show the ESR, and also for marketing to show the ESR of their components is low. those online tables are rough estimations and they do not mention the frequency. you gain experience with some repairs. mostly ripple and heat cause the capacitors to fail
Are you sure? it's a Boya M1 microphone. By the way, I'm not an English native and don't prepare a script for narration. so grammar and pronunciation mistakes are predictable
only an idiot thinks that can test components "reliably" inside an unkown circuit 😊. I follow several channels and always see people make false assertion
it depends, sometimes you can perform in-circuit testing and sometimes it gives you some misleading readings, especially on ESR, even if you drive the capacitor with the 0.3V signal. By the way, usually in-circuit testing is good when the values are way out of range, however, as you see in the video, there are some cases in which there is no option other than getting the capacitor outside. I have experienced both, therefore "it depends" could be the best answer. finding the schematic is sometimes impossible and naturally, companies are not willing to disclose it.
Thank you for this video, its one of the best I've come across on the topic of testing capacitors. You have many factors to consider when testing capacitors. First is visual inspection, second is capacitance value, third is ESR, fourth is dissipation factor, and fifth is phase angle. All while remembering to use the correct measuring frequency. I have a good grasp of these except for dissipation factor. I don't typically have access to data sheets for older electronics and don't have a chart of common values like I do with ESR values.
You're welcome. Using ESR-I mean the third step - 95% of the time, you can spot the bad cap, because I experienced branded caps sometimes do not fall in capacitance. This is 100% of bad electrolytic capacitors. those 5% are for non-electrolytic ones.
Do you ever see lower ESR than expected and would this mean the capacitor is bad? I have a 50V 22uF through-hole electrolytic capacitor that I suspected may be bad on a power supply. Using the Aideepen LCR-TC1 component tester I measure 24uF and 0.47 ohm ESR. Using an online chart I think the ESR should be like 10x that, but maybe I'm mistaken. I had pulled this one because it appeared to not have continuity to GND on the board and I heard that was one way to test for bad caps.
in one case you read very low ESR and that's when the capacitor is shorted, which happens mostly for ceramic SMD ones. But in your case when the capacitance is okay, I am suspicious about your LCR (if it's a brand or a DIY) and the measurement frequency (use either 100Hz or 120Hz if your LCR meter is one of these, for the electrolytic-type capacitor is above 10uF). take the capacitor out of the circuit and test it again, it might be a resistor or an inductor in parallel.
@@MyVanitar The capacitor was already taken out of the circuit. I didn't make the meter myself but it is a cheap (under $30) meter from Amazon. I just recently got the LCR and this was the first thing I tried with it, so if it's not accurate, I'm not sure. I can't set the frequency myself, it's pretty much automatic, you stick the part in and hit a button and it does some things to detect what the part is and display info.
with higher frequency, the ESR value drops so I think your capacitor is fine, especially when you read 24uF. Test it with some faulty capacitors
@@MyVanitar That makes sense, so it's probably not using the ideal frequency for this capacitor so it looks weird. Thank you. I don't have any known bad caps around to test but I am trying to find bad caps on this board so I guess I'll pull and test some more and see how they look.
usually, the frequency of such devices is fixed at 100KHz, used by many manufacturers and datasheets to show the ESR, and also for marketing to show the ESR of their components is low. those online tables are rough estimations and they do not mention the frequency. you gain experience with some repairs. mostly ripple and heat cause the capacitors to fail
👍
Your audio is not very good...better microphone?
Are you sure? it's a Boya M1 microphone. By the way, I'm not an English native and don't prepare a script for narration. so grammar and pronunciation mistakes are predictable
Nearly fell asleep.
the same as a technical class in the university?
Thank you for the tips ❤, I was thinking that only bulgy capacitors are bad 😂
Thanks
I thought this was going to be in circuit testing. Any idiot can test one out of circuit.
only an idiot thinks that can test components "reliably" inside an unkown circuit 😊. I follow several channels and always see people make false assertion
@@hp2073 If it's an unknown circuit, he should try to find a schematic before messing with it.
it depends, sometimes you can perform in-circuit testing and sometimes it gives you some misleading readings, especially on ESR, even if you drive the capacitor with the 0.3V signal. By the way, usually in-circuit testing is good when the values are way out of range, however, as you see in the video, there are some cases in which there is no option other than getting the capacitor outside. I have experienced both, therefore "it depends" could be the best answer. finding the schematic is sometimes impossible and naturally, companies are not willing to disclose it.
@@hp2073 he is free to share his opinion
@@MyVanitar Have you queried Sam's Photofact?