EEVblog 1465 - Your Multimeter Can Measure Inductors

I love tool tricks like this, please do more.

Well that's cool, unfortunately my Fluke 117 isn't good at it at all. It can't even be used on larger ones. The only one I got read reliably was a 100mH coil. I looked at it at the scope and it sends the pulse super random. Had to capture it, and it's a 120mV pulse, lasting 1.2ms, whenever it wants to. Surprisingly though, it reads capacitance great, down to the 10nF level.

For anyone wondering, yes this was an april fools haha. Took testing with 3 DMM's until I figured it out, good one.

And what is it supposed to be for.

Multimeters which measure capacitance are a fairly newfangled thing for me I was assuming it was slightly more clever than just seeing how long it took to charge 👍

Youre hilarious 😂😂 thx for the vid.

April Fools...

شكرا

i have a question that i cant find an answer too. i have a bench lcr meter and it has 4 connections for the kelvin clip test leads. the meter's test lead connections are marked Lcur, Lpot and Hcur, Hpot. which two connections does the positive test lead connect to? i cant find which test lead goes to which two terminals anywhere.

Is it woman speaking or man? Or an alien?

Too restless a presentation to understand it.

I need one that can measure 15v zener diodes ?

This method seems a little complicated. Seems like it would just be easier to build a calculator first instead of being so reliant on Post-It notes. Once you build your specialized calculator, it should be no problem to slam together components to make a functional oscilloscope and signal generator.

Here I was about to build a variable frequency signal generator... This is much easier. Thanks!

Fantastic, but i did not get, why we need to multiply by 1000. Where the 1000 come from?

Can you measure shorten rotor windings?

Very useful trick.. Thank you

This seems pretty wrong to me... You should at least tag it as April fools at this point. It displays as Mar 31st for most of the world as well.

Dave , or if someone knows , more info on the " open source " board used in video ?
Thanks again

Yes! Protek 505/506 can do it. :-)

Thanks dave. This is helpful.

Awesome sauce.

What did You do to Your small finger??!!!! Did You also start to make a cooking program?(Just put the knife away- You're the best @ electronics)

What?- EEVblog Multimeter? WOW

Show us the full setup, Dave... if you dare

technically, that’s inductive and capacitive reactance formulas.

Fluke, and Unit meters are nothing when sitting next to a genuine 121GW.

This is actually very very useful! I always wanted an LCR meter but couldn’t really justify the expense

I'm sort of confused because what I think is happening is that some DMMs dont measure impedance, but they measure the time constant repeatedly on each update.
Hence the frequency sort of increases with the capacitance values and ranges
I might be wrong tho
Atleast when I did this on my meter it didn't even measure the inductor

@eevblog: Confusor gave result of 161.7 uH, The RCL 161.23 I think more of "bang on"

It's interesting that for some of the meters the frequency changed with the capacitance. I wonder if those use the capacitor in an oscillator and then measure the resulting frequency to calculate the capacitance value (as opposed to measuring the time it takes to charge the capacitor which is how I had assumed it measured them).

nice tip. thanks

Nice trick for sure 😊

Very cool. Makes me wonder if it would be advantageous/convenient to have multimeters perform a mathematical operation (in real time) on a measurement. Basically, integrating the calculator into the device.

Good one; I'd have to measure my multimeter's cap-meter frequency some time

What, no April fools?

where did the screws go on just the multimeter measurements dave? :P

I don't understand. How can the rules for the math be the same for all DMMs even though they use different frequencies to measure?

Damn it, all my inductors have gone bad!

Dave is so good at April Fool videos, I decided to see what this year’s is and comes over as very convincing as usual 👍, some of the other channels first 30sec to 1min April Fool tho not Daves

"That's good enough for Australia." Love it... Great video!

Hang on, has he given up on the april fools jokes?

Nice trick. It tooks me almost 7 long minutes to understand the deeper meaning. 🙈 Congratulations!! You put in big effort!! 👍👍

Great video as always! Anyone knows what is that switchable L-C-R blue box that says OpenSource on the corner?

HENRIES AT OPERATING FREQ-VOLT-AMPS-TEMPERATURE ?

HENRIES AT OPERATING FREQ-VOLT-AMPS ?

I have 2 very old multimeters (over 20 years) and one has no capacitance measure and the other has slots to measure both on through hole components.

No April’s fool? That looks real.