Re: [volt-nuts] Anyone know how to make stable inductors?

On 20 August 2015 at 02:38, Todd Micallef wrote: > Here is a DIY guide to making some lab standards. It is detailed with some > component values. > > > http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf > As I wrote before, I think this is of dubious use, as yo

Re: [volt-nuts] Anyone know how to make stable inductors?

Sorry about the previous double-posting - had email problems. There is another option that occurred to me last night, to get an equivalent inductor from an accurate reference capacitor by using an active circuit gyrator. The problem of course is that the circuit will add errors too, diminishin

Re: [volt-nuts] Anyone know how to make stable inductors?

Haha, so it is legit - just a poorly described knock-off of the H-P unit. I had never heard of this unit, but it looks like good info to have, to replicate some equivalent reference inductors. Thanks for finding this document. Ed ___ volt-nuts mailin

Re: [volt-nuts] Anyone know how to make stable inductors?

Haha, so it is legit - just a poorly decribed knock-off of the H-P unit. I had never heard of this unit, but it looks like good info to have, to replicate some equivalent reference inductors. Thanks for finding this document. Ed ___ volt-nuts mailing

Re: [volt-nuts] Anyone know how to make stable inductors?

Nothing new. That is actually a direct copy of a HP 16074A 4-terminal quasi inductance standard. Even the pictures of the article were copied directly from the HP manual. 2015-08-20 11.50 UTC+03.00, Dr. David Kirkby (Kirkby Microwave Ltd) : > If this was April the first, I would be convinced that

Re: [volt-nuts] Anyone know how to make stable inductors?

Found the HP manual as suggested by Will: it is now clear where the capacitor is connected. On page 1 of the manual changes (page 3 of the PDF file) there is a very clear drawing of the quasi-inductance standard. The "C" port has no guard connections and is used to test the capacitor alone.

Re: [volt-nuts] Anyone know how to make stable inductors?

Nothing new. That is actually a direct copy of a HP 16074A 4-terminal quasi inductance standard. Even the pictures of the article were copied directly from the HP manual. > 2015-08-20 11.50 UTC+03.00, Dr. David Kirkby (Kirkby Microwave Ltd) > : > >> If this was April the first, I would be convince

Re: [volt-nuts] Anyone know how to make stable inductors?

t seems to work in > principle and would be worth building the real ones with shielded case. > Again, calibrating these meters does not require inductors, still it is a > pretty interesting approach i think. > > >> Gesendet: Donnerstag, 20. August 2015 um 03:38 Uhr >> Von: &

Re: [volt-nuts] Anyone know how to make stable inductors?

shielded case. Again, calibrating these meters does not require inductors, still it is a pretty interesting approach i think. > Gesendet: Donnerstag, 20. August 2015 um 03:38 Uhr > Von: "Todd Micallef" > An: "Discussion of precise voltage measurement" > Betreff:

Re: [volt-nuts] Anyone know how to make stable inductors?

On 20 August 2015 at 02:38, Todd Micallef wrote: > Here is a DIY guide to making some lab standards. It is detailed with some > component values. > > > http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf > OK, I tried this. I was hoping to use a box I had with

Re: [volt-nuts] Anyone know how to make stable inductors?

On 20 August 2015 at 19:11, Brooke Clarke wrote: > Hi Dave: > > I'd classify this article more like pseudoscience than April's fool. To > get an idea of the quality of the paper just check out the publisher. > Yes, the publisher does seem dubious. If Wikipedia is to be believed, they were willi

Re: [volt-nuts] Anyone know how to make stable inductors?

Hi Dave: I'd classify this article more like pseudoscience than April's fool. To get an idea of the quality of the paper just check out the publisher. "The Chinese Publisher SCIRP (Scientific Research Publishing): A Publishing Empire Built on Junk Science" what I found by searching for the p

Re: [volt-nuts] Anyone know how to make stable inductors?

The method described in the document would not make an actual inductor - it apparently fools the 4-port machine by providing the equivalent signals that the inductance would have. You can avoid getting precision inductors, and just go with this method (which I think is pretty clever if it actua

Re: [volt-nuts] Anyone know how to make stable inductors?

On 20 August 2015 at 02:38, Todd Micallef wrote: > Here is a DIY guide to making some lab standards. It is detailed with some > component values. > > > http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf > > If this was April the first, I would be convinced that

Re: [volt-nuts] Anyone know how to make stable inductors?

anyway. > Gesendet: Donnerstag, 20. August 2015 um 03:38 Uhr > Von: "Todd Micallef" > An: "Discussion of precise voltage measurement" > Betreff: Re: [volt-nuts] Anyone know how to make stable inductors? > > Here is a DIY guide to making some lab standards.

Re: [volt-nuts] Anyone know how to make stable inductors?

Here is a DIY guide to making some lab standards. It is detailed with some component values. http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf On Wed, Aug 19, 2015 at 8:48 PM, Dave M wrote: > Here's a paragraph from IETLab's web site on how their inductance >

Re: [volt-nuts] Anyone know how to make stable inductors?

Here's a paragraph from IETLab's web site on how their inductance standards are made: "Each standard inductor is a uniformly wound toroid on a ceramic core. It has a negligible external magnetic field and hence essentially no pickup from external fields. The inductor is resiliently supported i

[volt-nuts] Anyone know how to make stable inductors?

It's a lot harder than making stable capacitors... particularly for low inductance values. I think the process involves the use of rainbow flavored unicorn tears. There are some 0.01% standard inductors on Ebay starting at around $400 each. Also some .1% ones for a lot less. Decent L measur

[volt-nuts] Anyone know how to make stable inductors?

I was looking to make some inductors that I can use as a sanity check for my HP 4284A LCR meter. I don't too much care what their values are, but I want them to be stable with time. Any suggestions about the best way to make or buy them? I'd like values in the range of 1 nH to 100 mH. The LCR mete