Electronic Circuits and Projects Forum

Nobody???

Then, PLEASE, let me know if somebody knows the source (documentation) for LC/ESR (I think) meter - I have attached a schematic of this device - I have no other information!

Also, if somebody know the link for this meter in this forum let me know - I can't find it with search.

TIA!

I would suggest your requirements are pretty impossible, particularly for a homemade device - I would suggest you reconsider what you need, rather than what you imagine you might need.

I would also suggest you look at the Peak range, small and reasonably priced, two of them should do most of what you want

http://www.peakelec.co.uk/acatalog/jz_instruments.html

especially in VERY LOW-inductivity range (it must have capability to measure a 1 turn-air-core inductor, or even small piece of copper wire, whether a low or high Q!) with fairly good resolution and tolerance;

Dream on baby!
Accurate measurement of low value inductors is not the sort of thing where I would use a PIC or any other microcontroller.
For such low values of inductance, you need to be considering resonance methods such as a Q meter working at high frequencies.

JimB

Thank you all for replies!
I said that it may be two separate instruments. Any suggestion appreciated!
But what you think about LC meter from my second link (from ebay) - to good to be true?

See you later!

check this link to get some ideas..

http://www.eevblog.com/forum/index.php?topic=4476.0

First at all, sorry for delayed reply to your last messages, I didn't get notification!

So, kiriakos-gr thanks for link!

@TULLIO: thank you very much, but I prefer digital meters.

@dtmf75: your nick sounds familiar to me - are you famous DTMF from VRTP forum? Well, I just start to assemble that "Hungarian" LCM3 meter! Since I am not a member of VRTP (Ruslan is friend of mine btw.) maybe I can ask you about pot-core inductor, as I know you are using pot-core inductor in your version of LCM3? So, I somehow find one such core, but I don't know how to properly "use" it? The parameters are: outer diameter = 22mm (yes, I know, is it a little big), high of two halves together (in "working state") is 16mm. No air-gap! There is a hole through inner pillars of 5mm. It is very old Siemens & Halske 57T5 T26 X09 o.L. core. I don't have any info about T26 ferrite material. So, what do you mean, can I use it? If I wind it "multi-fillar" (litz-wire) like e.g. 7-strains - should I twist them, or just keep them together in a simplest way? Is the air-gap totally necessary? What should be a minimum and maximum diameter of each thread/strain (or allowable range)?

TIA!

way back when, we used to use a device called a "grid dip meter" (a solid state version called a "gate dip meter" exists also) to measure unknown inductances. you would attach a known capacitor to the inductor, then use the GDM to find the resonant frequency. once the frequency was known, along with the known capacitance, it was simple to calculate the unknown inductance.

http://www.electro-tech-online.com/c..._By_VU2PPP.pdf