EEVblog 1473 - How Your LCR Meter Works 

Err, yeah, that sounds more righter...

@@EEVblog Nay mate, the original was good enough for Hostralia...

And the red Xs in the bottom center diagram would be better placed on the imaginary axis, similar to the Rs on the real axis (or replaced by "Zs" instead). Great video nevertheless!

It is the same. It does not matter if you multiply something with -1 or dividing something with -1. It does not matter if the - sign is over or under, because it is the same. There is not "righter" :)

@@zsoltkohler7096 you're wrong. The value of Rs is always positive (by definition), while value of Xs may be negative (capacitor) or positive (inductor). So taking the absolute value of Rs makes no difference, while a negative Xs will result in a negative value of D. Also, as D is the reciprocal Q, the formula for D (Rs/|Xs|) should be the reciprocal of the formula for Q (|Xs|/Rs)

And when you just bought one

Sadly this is probably not helpful for you

as a matter of fact I am! And yup, lovit!

Many of the students I went to school with complained about this sort of theoretic treatment (a decade or so ago), but I find having a grasp of it massively improves my ability to find solutions in the applications I'm working on. Without the fundamentals, you can be totally lost when something doesn't work for some reason, or when you need to design something you can't copy from elsewhere. Maybe most people avoid both situations, but I sure can't!

@@martinmckee5333 Agreed. About 10 years ago, a power plant colleague said to me "they don't teach that stuff anymore, students have access to do much info that they don't need to know those concepts.". My response was "but SOMEBODY needs to know this stuff." He paused, then agreed. Bottom line is, engineering isn't about parroting back someone else's material. Without complete knowledge of fundamentals, an engineer is essentially doomed to failure, and should seriously consider switching careers (perhaps to philosophy, or a related trade).

You can't get enough huh ? well you said the magic words SO THIS........... IS FOR YOU ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9gEy2FJ_AiA.html&ab_channel=KneesTease

Pew Pew

Yeah, I think it was very similar, but seemed like an update was in order when doing the next video on in-circuit measurement.

Nice to see you, your SMPS videos taught me a lot

electronics like most subjects is kinda a cluster*uck, but its so goddamn fun

thats for sure 😊

with Electronics, the truth is 1500 is a small number you could do a lifetime of videos and still have stuff to talk about it just keeps going and going, which is why we love it YOU NOW UNDERSTAND WHY OUR PARENTS BACK IN THE 70S HAD NO PROBLEM WHEN WE STARTING PLAYING WITHOUT 150 IN 1 DICK SMITH ELECTRONICS KITS it would shut us up for a lifetime or at least until we put it down to have some dinner

The algorithm works in mysterious ways.

@@EEVblog he he he, we love yeh Bruce😉😁

Yes, could spend another 10 minutes on that. If I wrote a script that would have been in there.

I agree. Pls Dave 🙂

It looks like a good subject of the next video

Excellent LCR intro.

Nope.

Now if I measure my speaker (Using my very cheap LCR meter) the "8 ohm speaker" measures 1.9mH. At 1 Khz the impedance would equal 2*3.14159*1000 Hz*0.0019mH = 11.9 ohm ... nowhere near 8 ohms. At 400 Hz it would be 4.8 ohms and at 5 Khz would be 59.7 ohm. Thoughts?

I think you are correct, but I would think instead of "Rdut" you should be saying "Zdut". Zdut = Rs +jXs. Because saying "Rdut" implies it is a pure resistance.

It's possible to use trigonometry to get the values, but using complex arithmetic is much, much simpler.

That is what I thought so I am not sure what Dave is saying. Scalar measurements of the voltage and current, and then a measurement of the phase between them which is much easier than what he suggests, is enough. Making a sampled measurement at 90 degrees is possible but why? Modern instruments may do something completely different using a pair of FFTs. Read the Analog Devices application notes on the subject.

@@Alamagosa An FFT effectively samples at 90 degrees when it multiplies by sine and cosine. The only difference is that the relative phase between the source and the sine and cosine samples is random. This is not relevant to the measurement because all vectors are rotated the same and its only the phase difference between them that is important.

Capaciatne and inductance values are both determined by frequency. You can tell because the formula for them I showed will contain omega (W) which is 2 x Pi x Frequency

The Keysight is not cheap. It's nice, but bettre value to be had elsewhere.

@@EEVblog thank you

They're rubbish.

I meant this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-115erzCCxgE.html

@@barrybogart5436 thanks

this is the easy way

I disagree... Dave's teardowns and unboxing videos provide insight on how the device works/what are the main components of it

@@gustavrsh YES, but Dave is even more valuable on videos like these!!! I do NOT disagree that his unboxing/comments/analysis/attempt to repair it videos are not equally as impressive or valuable, but the state of the education system is so bad, that it has to be fixed by Dave doing his best to transfer his real-world knowledge to students, hobbyists, and young engineers. And I have nothing against old engineer, we are also having a blast watching these videos.

@@nameredacted1242 Online learning isn't really helping that equation. I once had a job interview where the person asked me how I obtained my degree/edumacation: online or in-person.

@@bitsurfer0101 I think that you are oversimplifying it. "Online education" has the stigma, rightfully so, of taking people's money, giving them a degree, and teaching them nothing, and not testing you well enough. Dave isn't taking your money, no degree is awarded, and it is up to you to determine if you are "educated enough". Dave is SUPPLEMENTING the sh!tificate of sh!tification that you get out of a "formal education system", the on-the-job training, and self-lead studies... I used to be an adjunct prof until COVID, so I see plenty of issues with the very expensive and not practical formal university education. I was not liked by either students or management because I taught really hard, on a great deal of topics, tested the crap out of students, and gave out plenty of low grades. As an engineer, I tried to raise my future coworkers, but that was interfering with kids' and parents' plans to get a guaranteed piece of paper with a good grade on it, for the (high) amount of money that they paid for it. And before all of that, I ran on an Associate's for more than a decade, until I start hinting to my management at an avionics company that I would like to become an engineer. They said that for liability reasons they won't allow that, and I need the BSEE. So they paid for it, I spent four years of my life upgrading from an ASEE to BSEE, then they promoted me. You might slip by in a small company and with lots and lots of experience as a tech become an engineer, but in a litigious society and with the management sold the pill that formal education matters, that's how it goes. One day when I will have my own company, I will give the basic entrance quiz on basic circuit analysis to a tech or an engineer, just to weed out the completely improper applicants, but the bulk of my interview would be: SHOW, NOT TALK, me some projects you worked on in your spare time, at previous jobs, during education, etc. Everyone can BS they way thru a verbal interview, but you can't fake a project (unless it was a team of other people who actually did the work, and you just got the credit, that happens too).

I didn't mean to put Dave into the rest of the bad teachers. He does a great job of educating on things that they don't necessarily teach in class and sometimes on the job-depending on the person's willingness to teach.

If I'm thinking correctly, it's just opposite of resistance so conductance? Measured in Siemens or mhos?

That simply cannot happen. It would imply a negative resistance, which would result in an increase in voltage the longer the circuit. If it could happen we could have perpetual motion.

@@fcolor0430- conductance is the inverse of resistance, not the opposite.

I think Xs=(Vq x Ip-Vp x Iq）

Never heard of them. But the rule of thumb is that almost every new battery company is impractical bullshit until proven otherwise. Almost all of them go nowhere.

@@EEVblog Thank-you very much for getting back to me I really appreciate it. That is exactly what I thought and I think it might be a theranos of battery tech in Silicon Valley. They are listed on NYSE and show picture of prototypes. Where the scam part comes in is that some representatives of the company said they have been going to Korea for weeks to close a deal with a Korean OE. To me that is outrageous, why would Samsung, LG, Hyundia etc need to buy unproven technology when they spend billions on their own battery technology.