Author Topic: 500 ppm LCR Meter at Elektor March 2013  (Read 9710 times)

0 Members and 1 Guest are viewing this topic.

Offline kripton2035

  • Frequent Contributor
  • **
  • Posts: 706
  • Country: fr
    • kripton2035 schematics repository
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #15 on: March 11, 2013, 10:22:01 PM »
Btw, offtopic about GO rlc2, did you purchase it in kit or you're building it from scratch ?

Must be interesting to watch the owner of the most complete ESR circuits repository on earth  ;D building his own LCR meter, can't wait to see the result of your rlc2 !  :-+
I build from scratch, there is no kit available that I know of.
and my lcr repository is not bad at all too !

Offline kripton2035

  • Frequent Contributor
  • **
  • Posts: 706
  • Country: fr
    • kripton2035 schematics repository
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #16 on: March 11, 2013, 10:26:08 PM »
@kripton2035

Damn, I thought it was open soft & hardware, cause from the 1st glance I saw it is somehow using off the shelf components. Really, I was intrigued when seeing those 4 big bnc connectors for the 4 wires measurement, looks really serious stuff.

As Rerouter  mentioned, if the price is right, maybe its still worth considering, but if its way too high, those Cyrustek chip based LCR meters definitely are hard to beat.
another thought : elektor can also sell this as a complete build board
they often do so when there are a lot of smd components ... and this one is a really good candidate !

Online firewalker

  • Super Contributor
  • ***
  • Posts: 1378
  • Country: gr
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #17 on: March 11, 2013, 10:27:23 PM »
I can;t remember any full open source project by Elektor.
Alexander.
:) projects that does not have any mcu inside ... there are still some !

Just "open" hardware. Although I am not sure they give away cad, gerber etc files.

I stopped buying Elektor years ago when bought a kit and located a bug on the firmware. They refused to address the issue or give me access to the source code to fix it my self.

Alexander.
Become a realist, stay a dreamer.


Offline notsob

  • Frequent Contributor
  • **
  • Posts: 590
  • Country: au
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #18 on: March 11, 2013, 10:27:36 PM »
So as I read this, the elektor unit has closed code for the kit, I wouldn't bother and also 4 x $US7.90 for the article series plus prob $200 for the kit, so if you want to build, go with kripton, or save your $230 and put it towards something better.
« Last Edit: March 11, 2013, 10:29:08 PM by notsob »

Online EEVblog

  • Administrator
  • *****
  • Posts: 12701
  • Country: au
    • EEVblog
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #19 on: March 11, 2013, 10:35:36 PM »
So as I read this, the elektor unit has closed code for the kit, I wouldn't bother and also 4 x $US7.90 for the article series

I paid 10 "elektor credits" for the article, whatever that's worth (I have a bunch from when I got something published).

Dave.

Online firewalker

  • Super Contributor
  • ***
  • Posts: 1378
  • Country: gr
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #20 on: March 11, 2013, 10:49:48 PM »
Huh ? Until mid 2013  ? :palm:

Btw, offtopic about GO rlc2, did you purchase it in kit or you're building it from scratch ?

Must be interesting to watch the owner of the most complete ESR circuits repository on earth  ;D building his own LCR meter, can't wait to see the result of your rlc2 !  :-+

Any link for the GO rlc?

Alexander.
Become a realist, stay a dreamer.


Offline kripton2035

  • Frequent Contributor
  • **
  • Posts: 706
  • Country: fr
    • kripton2035 schematics repository

Online firewalker

  • Super Contributor
  • ***
  • Posts: 1378
  • Country: gr
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #22 on: March 11, 2013, 10:53:49 PM »
Thanks.

Alexander.
Become a realist, stay a dreamer.


Offline Marco

  • Frequent Contributor
  • **
  • Posts: 744
  • Country: nl
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #23 on: March 11, 2013, 11:36:13 PM »
I can;t remember any full open source project by Elektor.

Huh ...  and there goes the chance of me ever subscribing. How are you supposed to learn anything if they don't thoroughly explain the firmware? It's over half the effort of the design.

PS. why the hell would you use a 8051 and use mains frequency of your reference in this day and age? Unless you need ultra-low power you can't beat 32 bit chips for convenience and cost isn't an issue any more and you can't run off batteries if you use mains as your clock source.
« Last Edit: March 11, 2013, 11:37:52 PM by Marco »

Offline Nermash

  • Regular Contributor
  • *
  • Posts: 216
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #24 on: March 12, 2013, 01:05:14 AM »
It does not use mains frequency as reference, it generates its own square signal and filters it to sine...

Offline Noize

  • Regular Contributor
  • *
  • Posts: 157
  • Country: gb
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #25 on: March 12, 2013, 01:14:14 AM »
I bought 10 credits this morning for £1 to get the article for that esr meter.


So as I read this, the elektor unit has closed code for the kit, I wouldn't bother and also 4 x $US7.90 for the article series

I paid 10 "elektor credits" for the article, whatever that's worth (I have a bunch from when I got something published).

Dave.

Online DmitryL

  • Regular Contributor
  • *
  • Posts: 54
  • Country: gb
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #26 on: March 12, 2013, 01:26:27 AM »
+1
in the go rlc2 there are "only" 1% resistors in series with the 4052
and as I understood it the software calculates the error
so yes why did elektor use 0.01% resistors in such a configuration ?

The more precise resistors in the differentional amplifiers, the better. I used 0.1% in my RLC2, and it didn't hurt :)
BTW, when you finnish the device, don't froget to make Open, Short and Load calibration with a set of known precise  _smd_ resistors, otherwise measurements won't be good enough.
« Last Edit: March 12, 2013, 01:31:06 AM by DmitryL »

Offline BravoV

  • Super Contributor
  • ***
  • Posts: 3051
  • Country: 00
  • An EEE (Eternal Electronics Enthusiast)
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #27 on: March 12, 2013, 02:00:07 AM »
Thanks to all for the insights of this circuit, glad I didn't buy the credit just to download this issue.

Looking at the test frequency, wonder why they dont make up to 100 KHz as well since this is started from the scratch.  :-//



and my lcr repository is not bad at all too !
My apology, I meant the world most complete diy lcr cicrcuits repository on earth.   :-+

Offline Rufus

  • Super Contributor
  • ***
  • Posts: 1756
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #28 on: March 12, 2013, 02:03:33 AM »
Those chips are in the order of 50-100ohm on-resistance depending upon voltage, and it varies a lot with temp too IIRC.

The channel resistance of the 4052 has no effect on measurements - the design isn't that dumb.

Offline Rufus

  • Super Contributor
  • ***
  • Posts: 1756
Re: 500 ppm LCR Meter at Elektor March 2013
« Reply #29 on: March 12, 2013, 02:08:04 AM »
It does not use mains frequency as reference, it generates its own square signal and filters it to sine...

It is likely specified measuring at twice the local mains frequency to help reject mains pick up on the component and cables.


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf