Questions to Nard(plons)(about his LC meter)

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Rohalamin
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Posted by Rohalamin: Fri. Nov 1, 2013 - 10:11 AM
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Hello Nard, :)
I need to a good LC meter, after many search I found your LC meter. I think it's best :wink: . Now, I have several question to you.
1- What's your opinion if I make it by SMD components?
2- I need to C code of the LC meter but, you have wrote it by Bascom. :(
3- If i will increase the cable of LC meter, in your opinion which type of cables is suitable? (for about 30-40 cm)

Sorry for topic(I would send it to your PM). I created this topic because i thought other guys can use of this.
:wink:

B.T.W: Nard's LC meter

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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Learning and Information, General Electronics
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Kartman
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Posted by Kartman: Fri. Nov 1, 2013 - 11:20 AM
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Smd components are ok. You just need to chose the critical parts carefully.
What difference does it make what language the code is written in? If you wantvC, then translate to C.
Cable will make a big difference. What range of capacitance / inductance do you want to measure? Avoid if possible.

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jgmdesign
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Posted by jgmdesign: Fri. Nov 1, 2013 - 11:36 AM
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Quote:
Sorry for topic(I would send it to your PM). I created this topic because i thought other guys can use of this.
Great idea!! I have most of the parts to build one of these, might actually do it too. :)

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Rohalamin
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Posted by Rohalamin: Fri. Nov 1, 2013 - 12:14 PM
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Kartman wrote:
Smd components are ok. You just need to chose the critical parts carefully.
What difference does it make what language the code is written in? If you wantvC, then translate to C.
Cable will make a big difference. What range of capacitance / inductance do you want to measure? Avoid if possible.

GCC compiler (Atmel Studio). I don't want to use of Codevision because i haven't bought CV licence. I would like to develope it(with a nice LCD).
I don't know Bascom, many of iranian use of Bascom for AVR. I don't know the range of this LC meter.
jgmdesign wrote:
Great idea!! I have most of the parts to build one of these, might actually do it too. :)

Hey Jim, I had already bought a VC9805 Digital Multimeter for my jobs but it has some defect. for example the socket of inductance and capacitor is on case :( .

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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Plons
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Posted by Plons: Fri. Nov 1, 2013 - 03:33 PM
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Hi Rohalamin,

I think this thread would fit better in GE, but OK ... it can be moved there anytime.

As Russell already explained: a cable is a bad idea. For capacitance not too bad, but for inductance it's a no-go.

Fellow-freak fmaimon from Brazil rewrote the SW using C; drop him a PM and refer to this thread. IIRC he used a mega168 instead of a mega8.

It's been 5 years since I built Elmcie: still no need for external calibration ! Still happy with it.

Nard

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tricia, and Ulyana. You can find them https://www.linuxmint.com/

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Gold Markclawson
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Posted by clawson: Fri. Nov 1, 2013 - 04:07 PM
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Oops. I moved it then realised you are a moderator in OT and could have done yourself - sorry for trading on toes! ;-)

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Rohalamin
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Posted by Rohalamin: Fri. Nov 1, 2013 - 04:17 PM
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Thanks Dear Nard
Ok, i sent a PM to fmaimon. I hope he see my PM and answer to me.
I want to use of a suitable wire but, I don't know which is the best?
I don't know why those damn factory put the socket on the multimeter case. :?

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

Last Edited: Fri. Nov 1, 2013 - 04:29 PM
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Plons
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Posted by Plons: Fri. Nov 1, 2013 - 04:23 PM
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@Cliff: it's OK :) My toes are quite standard .... not very long ....

@Rohalamin: fine wire, for what ? To connect the DUT (Device Under Test) ?

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tricia, and Ulyana. You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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Rohalamin
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Posted by Rohalamin: Fri. Nov 1, 2013 - 04:38 PM
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@Plons: Sorry, suitable wire(or cable) not fine! :wink:
accuracy of the LC meter is important for me because I want to use it for telecommunication purpose.

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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fmaimon
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Posted by fmaimon: Fri. Nov 1, 2013 - 04:59 PM
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Everything I did is in this link: https://www.dropbox.com/sh/2fs91...

The only modifications I did in Nard's schematic were the use of an Atmega168 and a 18.432MHz crystal, if I recall correctly.

Felipe Maimon

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Kartman
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Posted by Kartman: Fri. Nov 1, 2013 - 09:27 PM
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Rohalamin, defect or 'design feature'? The idea is to keep the connections as short as possible otherwise the wires will add to the measurement. Try it for yourself- try measuring the same component with a length of wire and without. How does the reading change?

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Rohalamin
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Posted by Rohalamin: Sat. Nov 2, 2013 - 03:57 PM
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fmaimon wrote:
Everything I did is in this link: https://www.dropbox.com/sh/2fs91...

The only modifications I did in Nard's schematic were the use of an Atmega168 and a 18.432MHz crystal, if I recall correctly.


Special thanks to dear Felipe! :D
Why did you use of 18.432MHz? do you have any specific reason?
I downloaded the GCC folder. is it correct?
Kartman wrote:
Rohalamin, defect or 'design feature'? The idea is to keep the connections as short as possible otherwise the wires will add to the measurement. Try it for yourself- try measuring the same component with a length of wire and without. How does the reading change?

:roll: this "design feature" trouble me! :lol:
so I did not this act but I think it will has almost a big difference(at laest for my jobs).

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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Rohalamin
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Posted by Rohalamin: Mon. Nov 4, 2013 - 03:49 PM
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Booom! :mrgreen:
Again it's me. :) these Nard's LC meters designed by my iranian friends. :wink:
First designed by Shahram Nurbakhsh-rad:

And seceond, designed by Mahdi:

Also, I have a problem. :(
I can't find any LC meter in my city(for Calibrating).
Nard,
Do you have any idea for Calibrating it without any LC meter? :roll:

B.T.W: for more follew this link:
LCF meter

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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Plons
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Posted by Plons: Mon. Nov 4, 2013 - 05:38 PM
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I could send you two capacitors to get you going. If you stay away from the 30cm wires, they will give you a guesstimated initial accuracy of 0.5% ...

Any fellow members who know about applicable export restrictions for these cap's ??

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tricia, and Ulyana. You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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Rohalamin
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Posted by Rohalamin: Wed. Nov 6, 2013 - 06:00 PM
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Plons wrote:
I could send you two capacitors to get you going. If you stay away from the 30cm wires, they will give you a guesstimated initial accuracy of 0.5% ...

Any fellow members who know about applicable export restrictions for these cap's ??


So i don't know. :roll:
Nard, I think Your schematic has a problem. My friend said me "the L1 inductance is not suitable!(100uH)" he changed it to 65uH because he said, the L1 could not make 500-600khz oscillation. :roll: Now, By 65uH, it can fine work. In your opinion, Why it could not work by 100uH?(look to Mahdi's board)

"One's value is inherent; money is not inherent"

 

Chuck, you are in my heart!

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Plons
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Posted by Plons: Wed. Nov 6, 2013 - 10:22 PM
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Quote:
Nard, I think Your schematic has a problem.
No, it has not. It works. And has been working .... for 5 years :)

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tricia, and Ulyana. You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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