LCR Meter Basic Circuit Sample

Discussion in 'General Electronics Chat' started by Engr, Feb 7, 2011.

  1. Engr

    Thread Starter Member

    Mar 17, 2010
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    5
    Hi Guys. I was looking for a circuit that can measure inductance, capacitance and resistance. A basic or simplified circuit will do. If someone has a knowledge about this circuit, I need help on this one...Thanks
     
  2. someonesdad

    Senior Member

    Jul 7, 2009
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    You can look up the instruction manual for the GR 1650 impedance bridge; it has schematics in it for a manual measuring system. It used variations on the Wheatstone bridge.
     
  3. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    $25 will get you a good LC meter from eBay, look through my previous posts. A DMM can be as cheap as $2.99 from Harbor Freight when they put them on sale and it will even give you an approximate HFE of a transistor.
     
  4. Engr

    Thread Starter Member

    Mar 17, 2010
    114
    5
    I was searching the internet for a copy of the manual but I only find a file containing the specs, not the manual. It would be great if you can send me a link to this manual....Thanks
     
  5. someonesdad

    Senior Member

    Jul 7, 2009
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  6. Engr

    Thread Starter Member

    Mar 17, 2010
    114
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  7. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    Capacitance and resistance are relatively simple, until you get to very large or very small values. Both are features of nearly every DMM around for low cost.

    Inductors aren't as straightforward to measure, one quick trick is to use a signal generator and a meter
     
  8. Engr

    Thread Starter Member

    Mar 17, 2010
    114
    5
    The capacitance that we are measuring is around 100pF....
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,696
    904
    Did you try Google?

    From our own (shared of course) Dick Cappels (includes code):

    http://cappels.org/dproj/nlglcm/Pretty Good LC Meter Project.html
    http://cappels.org/dproj/EvenBetterLCMeter/Even_Better_LC_Meter.html

    Commercial/Kits
    http://electronics-diy.com/lc_meter.php
    http://my.integritynet.com.au/purdic/lc-meter-project.htm
    http://alfaelectronics.com/shop/product_info.php/cPath/27/products_id/54
    http://www.elexp.com/tst_b810.htm
    http://www.peakelec.co.uk/acatalog/jz_lcr40.html

    The DIY kit apparently first appeared as a 16F84 based unit. Unfortunately the links I had were all "updated" to the commercial site that now lacks the source code as best I can tell.
    I think I found the code here: http://ironbark.bendigo.latrobe.edu.au/~rice/lc/index2.html

    John
     
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