diyfan_ advanced lc meter
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5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 1/11
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Sunday, July 8, 2012
Advanced LC meterAfter finishing my last project - "Simple LC meter", there were some discussions in the forum I am a member of, thatability to measure electrolytic capacitors would be very useful in this type of device. I searched the Web and found a very cute project named LCM3 on this Hungarian site: hobbielektronika.hu . I loveHungarian rock since my school days, but I don't know a word in Hungarian :( . So, I searched the Web again, this timefor this specific project and found a Russian forum where the project was discussed in details and I got more usefulinformation about parts, settings and so on.
Specifications of the LCM3 are (according to authors of the project):Capacitors:from 1pF to 1nF - resolution: 0.1pF, accuracy: 1%from 1nF to 100nF - resolution: 1pF, accuracy: 1% from 100nF to 1uF - resolution 1nF, accuracy: 2.5%Electrolytic capacitors:from 100nF to 100 000uF - resolution 1nF, accuracy: 5%Inductance:from 10nH to 20H - resolution 10nH, accuracy: 5%Resistance:from 1mOhm to 0.5Ohm - resolution 1mOhm, accuracy: 5%
So, I put the schematic in Eagle and this is the result:
As usual I designed a new PCB. The PCB is designed in such a way, that it is possible to mount the LCD display on top
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5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 2/11
of the board. The multiturn trimmer for adjusting the contrast is bellow the display, so it must be of this type : Тhere is also an option for mounting a 3-pin terminal connector, so it's possible to usethe whole device without an enclosure.
All resistors are 1% metal film. Two 1nF capacitors are 1% styroflex. CX1 - 33nF is alsocritical - this must be polypropylene high voltage capacitor. I tried with two types: 10%X2 275Vac and Panasonic 3% 800V - worked fine with both. The inductor must be withlow Rdc. There is a connector for a separate adapter, which bypasses the ON/OFFbutton. Maybe on next revision of PCB I would add an onboard power connector.If the device is powered with external power adapter, you may increase back lightcurrent by decreasing the value of the resistor R11. You must consult with thedatasheet of the display to select a proper value of the resistor.
I must warn you - capacitors MUST be discharged before measurement or there is a danger of destroying the chip.
Here is the final result. This is the second unit I built:
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5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 3/11
As you can see on the last photo, it is possible to measure small value resistors,which is a nice bonus :)
Link for downloading project files in PDF: LCM 3.rarUse them on your own responsibility.Link for downloading hex file (on the bottom of the page).
Update: 08 June 2013Recently I found in one of the local web stores an enclosure which I thought would be perfect for this device. As it turnedout this wasn't the case :(So I bought it and when it arrived I found that the internal width of the enclosure was insufficient for normal LCD 16x2displays. I started looking for smaller displays and found out that it is hard to find such devices and they are veryexpensive.Anyway, finally I bought the only one available (but three times more expensive) display and made a new PCB for thisparticular case and display. The schematic is the same as above.
5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 4/11
Here are some pictures of my new LC meter:
5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 5/11
Expensive styroflex 1nF/1% capacitors.
For bigger inductance the meter shows parasitic capacitance.
5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 6/11
в 20:42
Етикети: DIY, ESR, LC meter, LCM3, PIC16F690, schematic
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31 comments:
Logger November 13, 2012 at 9:08 PM
Здравей, каква е цената за един брой от изделието по-горе?
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Христо November 18, 2012 at 12:59 PM
Зависи какви части ще ползваш. Около 40 лв. излизат частите, които аз ползвам. Кутията е ощекъм 12-13 лв.Ако питаш за колко аз бих направил по поръчка - 80лв.
b173664 December 29, 2012 at 3:19 PM
test1 час не мога да разбера как да напиша един прост коментар на блог, най накравя успявам сега ако успеяда на пиша грозната кепча картинка и разкривените букви правилно теста ще е успешен
Здравей! Имам няколко въпроса защото много исках да си направя LC meter! Първо: защо излизат толковаскъпо частите? ПИК-а във Farnell не е толкова скъп. Аз си мислех ч максимум 10-15 лева отиват за частитебез кутията. Дисплеите са по няколко долара в eBay. Както и да е да оставим цената на странаДруги въпроси: бутоните какви са: натискаш еднократно и се връщат или като ги натиснеш остават внатиснато положение? 1вия е за включване, със втория се избира режим LC а с третия се избира режимкалиброване? (с точен кондензатор)Първо реших да правя първата схема, но после видях че тази мери малки резистори, и това е бонус.ДРУГ ВАЖЕН ВЪПРОС: какъв дисплей се ползва за първата схема и съответно какъв за тази? Първатапише ще може да работи с 16x2 и с 16x1, това какво ще рече? Ако позлвам дисплей с 2 реда ще виждамли допълнително 2ри ред с цифрички (информация) или не?Реално МИкроконтролера показва само 1 ред?СЪЩИЯ въпрос за 2рата схема: там се вижда че като че ли е задължително да се ползва дисплей с2реда?И ПОЛСЕДЕН ВЪПРОС (поне засега) Какви са обхватите на 2та реда за мерене на L и C? Кой уред има поголям обхват и кой е "по-точен"?Благодаря предварително с нетърпение очаквам отговори!
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Христо December 29, 2012 at 4:51 PM
Цената е относително нещо, зависи от курса на долара, примерно. Предполагам, че може да сенамерят и по-евтини части. Освен това в крайната сума съм включил и изработката на платка.
Бутоните са два задържащи - за L/C и за ON/OFF и един незадържащ, който е за RESET (средниябутон).
Дисплея за LCM3 задължително е двуредов, докато за по-простия LC метър може да е 1 или 2реда, защото информацията, която се показва реално е само на 1 ред.
За точността не мога да кажа, защото нямам еталонен уред, с който да ги сравня. Обхватите и точността на LCM3 можеш да видиш на този линк:http://www.hobbielektronika.hu/cikkek/lcm3_alkatresz_mero_muszer_-_kit_lehetoseg.html?pg=3Точността, дадена в таблицата предполагам е само ориентировъчна. Избора на части инаправата на платката оказват голямо влияние.
5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 7/11
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И на другия въпрос - не няма разрядник. Кондензаторите задължително трябва предварително даса разредени.
b173664 December 29, 2012 at 3:21 PM
+ още нещо: първия LC meter в блога има ли разрядник, демек с него мога ли да меря зареденикондензатори без да го повредя?
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Ribar Prytov January 28, 2013 at 5:44 PM
А кой hex файл трябва да се ползва за PIC-a, от унгарския сайт или друг от руския. Ако може добави линки за него в блога.
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Христо January 29, 2013 at 6:34 PM
Аз ползвам последната версия - 1.35 от унгарския сайт.Ето линк: http://www.hobbielektronika.hu/cikkek/lcm3_alkatresz_mero_muszer_-_kit_lehetoseg.html?pg=7
andy June 14, 2013 at 9:29 AM
how much the bill of material? where to buy styroflex. capacitors and L1 online? thx
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Христо June 14, 2013 at 1:56 PM
It costs about a 25-30 USD with standard 16x2 LCD display and without enclosure. Styroflex is brand name for polystyrene.The capacitors I use can be found in Farnel and Newark. http://www.newark.com/lcr-components/fscex-1000pf-1-250v/capacitor-polystyrene-film-1000pf/dp/74K0403
andy June 20, 2013 at 12:50 PM
This comment has been removed by the author.
andy June 20, 2013 at 1:42 PM
hi christo do u have an email? thx
Христо June 20, 2013 at 2:36 PM
You may write me at "xristost" in yahoo.
Paku Bess August 31, 2013 at 1:42 PM
where i can download the Hex File For This Advanced LC meter
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5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 8/11
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Христо August 31, 2013 at 9:32 PM
I have updated the post and added the link for downloading the HEX file.
Abu-Hafss November 17, 2013 at 6:12 AM
Hi
I am newbie for PICs. In fact, this would be my first project.I could not find 16F690 in local market. Is it possible to use some other PIC ? If yes, what other PICs can be used.OR Is a program designed for a specific PIC?
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Христо November 17, 2013 at 1:54 PM
It's not my project, so I can't answer you for sure. Maybe it can be used another PIC microcontroller, but for surethere must be another PCB and another program code.
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Abu-Hafss January 11, 2014 at 12:42 AM
Can you please let have the contacts of the original author? I could not find any link at the Hungariansite. Maybe, he can rmodify the course and get me new HEX file for some other PIC.
Abhijeet Vishwakarma December 12, 2013 at 7:13 AM
Hello admin,I have built this Advanced LC Meter, previously i had the Simple Version of this LC meter,My Advanced LC Meter seems to have some problem, that i hope you could resolve.Im able to measure Electrolytic Capacitors with a good accuracy, but it doesnt displays the ESR for ElectrolyticCapacitors, instead displays a ? mark.Also it is unable to measure Bipolar Capacitors & Inductor values & displays some random values. But it doesmeasure them.
I have used a 100uH Inductor, the one's that look like a resistor with colour code's. I measured it's resistance andseems to have effective resistance, even higher than those inductors which i made by winding a 22AWG wire on atoroid (350uH).
i think this resistance is the problem, cause you have mentioned the Rdc must be very low.I understand, its not your own project to make any remarks on it.If possible kindly suggest any modifications.
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Христо December 12, 2013 at 1:15 PM
Hi,Did you calibrate the meter before measurement? If you not, maybe this is the problem. In "C" mode,connect the test probes as for measurement the electrolytic capacitors and short them. Then press andhold the "RESET" button until the message "Switch to meas." appear and then release the button. Notethe Uesr value shown on the screen.Now the value "Rx = " must be around 0 Ohm (±10mOhms) when the test probes are shorted.Calibrating the LC meter in the "L" mode is the same - only test probes are plugged to the "GND" and"L/C" connectors and shorted again.Now, if the Rdc of the inductor is too high the Uesr will be high and the accuracy will be low.On my LC meter the Uesr is 108mV. I suggest to replace the inductor. These coils that looks like
5/10/2015 DIYfan: Advanced LC meter
http://diyfan.blogspot.com.ar/2012/07/advanced-lc-meter.html 9/11
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resistors are not good for this schematic. They usually have Rdc higher than 1-2 Ohms. On my LC meterthe inductor's Rdc is 0.18 Ohms.
Abhijeet Vishwakarma December 15, 2013 at 8:21 PM
Hi Again, i finally got it working just when i was about to give up.
The actual problem was 1nF Styroflex Capacitor that formed the resonant circuit. It's value changeduncertainly thereby causing measurement errors. Replaced with another Capacitor and Device isworking like charm.
Im amazed with the accuracy of this meter. Its really fun playing with.I also replaced the inductor by a 100uH Choke that i made by removing some turns from 1.8mH Choke,lol.
Thank you for your support admin, im successful with two of your projects now : )Keep Posting such wonderful projects.
Abu-Hafss January 15, 2014 at 2:30 PM
Hi
Can you please provide the Eagle files of the circuit, I want to make some changes in the PCB according to parts Ireceived.My Eagle does not have PIC16F690 model. Thanks for the help.
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Abu-Hafss February 18, 2014 at 7:45 AM
Hi
You used a DPDT switch for calibration, can we use a SPDT switch?How the calibration is done?
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Христо March 6, 2014 at 1:28 PM
Sorry, I forgot to answer your questions.First, I did not give Eagle files. In standard libraries some parts are missing, for example this particularPIC, but u can make it in library editor as I did. Also you can search for user-made libraries in eagle site: http://www.cadsoftusa.com/download-eagle/libraries-dev/There for sure you can find PIC16F690 and many other missing parts.Second. You can use SPDT switch as the second part of DPDT switch in the schematic is not used atall. Of course you must change the PCB to incorporate the different parts.
Roberto Tejada September 14, 2014 at 5:18 PM
HI to program this pic 16f690 does it has to be a pikit2 or do u know another pic programer that is comparablewith 20 pins pics I have a pic programer for any pic but this one do u know any schematic for a pic programers toprogram this pic. I when to Google and couldn't find any suitable one. Can you help me plz tank u very much
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Христо September 15, 2014 at 10:08 AM
Before I made my clone of PICkit2, I used a cheap chinese programmer like this: http://www.ebay.com/itm/PIC-K150-USB-Automatic-Microcontroller-Programmer-ICSP-Download-cable-
5/10/2015 DIYfan: Advanced LC meter
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New-/271276024502?pt=LH_DefaultDomain_0&hash=item3f294fa2b6It can program 16F690, but only in ICSP mode. The problem is It's software is pain in the ass toconfigure and to use.
Roberto Tejada September 17, 2014 at 3:28 AM
thank you
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Anup Sarkar November 17, 2014 at 2:07 PM
Sir What is the specification of the relay switch and L/C, power switch.
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Anup Sarkar November 18, 2014 at 7:53 AM
Sir please tell me the range of this meter.
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Anup Sarkar November 18, 2014 at 11:42 AM
sir in your advanced lcr project what is the function of JP2 ICSP , and X1, X2. and how to use those,how to makecalibration of these meter. please help me.
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Anup Sarkar November 27, 2014 at 10:13 AM
sir, may I get your e-mail id?
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Roberto Tejada January 26, 2015 at 3:56 PM
I have built this Advanced LC Meter, previously i had the Simple Version of this LC meter,and it work great I loveit.Now this one when I turn it on it says CALIBRATION corrupted I try to fix it if you know how to fix this can givesome advise please it will be appreciated thank you very much
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5/10/2015 DIYfan: Advanced LC meter
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