What is with all this ESR stuff anyway?
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- čas přidán 13. 09. 2024
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In this video we try to shed some light on ESR and what it has to do with capacitors. I have been getting a lot of questions about the whys and how’s of the lab so I am hoping to shed some light on things. As always questions can equal videos so keep them coming and I will work on peeling the onion one layer at a time.
** Repair exposes the Tech to mains electric and should only be done by trained personnel. Errors can be fatal. **
I have the Keysight U1732C , handheld that looks a bit like yours. NOTE: Discharge all caps Before testing or reversing leads. As a casual hobbyist I put off the expense of an lcr meter, however now that i have one I realize I should have got one a long time ago! Anyone working with or winding your coils, this is what lets you do so with confidence. Same with checking caps and resistors to find out inductance. 100hz, 120hz, 1khz and 10khz test ranges, for most esr the 120 / 100hz setting for large caps are perfect. If your trying to match caps for something like a wein oscillator , much smaller caps use the high freq. Also tells disapation factor, phase angle, Z . All that to say a LCR meter is a worthy investment, and the one you're using in the video is lot less expensive and yet very very comparable.
Good explanation! 👍
Thanks.
Nice hat tip to the late, great Rob Pease
Actually, the CPU's voltage regulator circuit is also fed from the 12V power supply rail in ATX systems. 3.3V is mostly used for some auxiliary stuff on the main board.
Love the cat :)
That resistor load looks familiar 😂
At 28:18 I think you made a mistake. The higher the voltage rating, the lower the ESR is.
This is not always the case and sometimes even depends on the physical construction. A shorter fatter capacitor will often have a better ESR than a longer skinnier one at a given voltage rating.
I have a pair of HP LCR analyzers, 4274A and 4275A that allow us to characterize parts at AC from 100Hz all the way out to 10MHz. Having done component characterization for over 30 years with these machines, I would venture to say there are no reliable ‘rules of thumb’ to predict very much based on physical shape and volt rating. So many internal design factors have an influence.
I've decided that my handheld lcr gives more detailed numbers regarding esr if I compare Q values. All this is definitely frequency dependant. I'm interested in understanding why different non electrolyte caps' esr are/aren't very frequency dependant.
Finding esr at higher frequencies is very useful, but most lcr's only go to 100kHz, so I've been trying to characterize using nanovna.
In terms of frequency even the $20,000 LCR meter only hits 2Mhz.
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