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roykyn
Joined: 15 Sep 2006
Posts: 254
Helped: 7
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 30 Sep 2006 23:12 pic lc meter |
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| NEED SCH PCB AND WAT NOT.....
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are
Joined: 16 Nov 2004
Posts: 81
Helped: 5
Location: Balen (Belgie)
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01 Oct 2006 15:00 lc meter |
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look at
h**p://www.qsl.net/iz7ath/web/02_brew/21_LCMeter01/
its works fine
regards
albert
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platonas
Joined: 14 Aug 2004
Posts: 165
Helped: 5
Location: Universal Citizen
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01 Oct 2006 17:47 lc meter 16f628 |
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Try this one, it uses a PIC, it is very accurate and simple.
I had built it and works fine.
| Code: |
| http://electronics-diy.com/lc_meter.php |
There are also some other projects on the above page.
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roykyn
Joined: 15 Sep 2006
Posts: 254
Helped: 7
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13 Oct 2006 20:33 lc meter pic |
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| dude i know better site than those...use a google search....i have a new problem....i cannot get accurate value capacitors or inductors do u have any method to minimize the error....
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada
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14 Oct 2006 13:23 16f628 lc meter |
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| roykyn wrote: |
| dude i know better site than those...use a google search....i have a new problem....i cannot get accurate value capacitors or inductors do u have any method to minimize the error.... |
The LC meter (that uses the PIC) requires two things to be accurate.
1 a 4mhz crystal (the PIC is basically a frequency counter)
2 an accurate capacitor for calibration.
If you have access to a capacitor meter then simply hand check a few.
Some versions of the L/C meter have a frequency display to tell you the free running frequency of your tank circuit. Still you need to know at least one variable (inductor or capacitor value) to modify the software for calibration.
If you have no access to those two somewhat common parts then your L/C meter will be inaccurate and you have no way to know by how much.
You need the tools. Else your SOL.
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Google
AdSense
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14 Oct 2006 13:23 Ads |
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melc
Joined: 08 Apr 2005
Posts: 394
Helped: 45
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14 Oct 2006 16:00 pic capacitance meter |
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So, the beautiful picture showing a 0.1pF it's just a measurement error ?
How many pF has the measuring cable connected to this capacimeter ?
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada
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roykyn
Joined: 15 Sep 2006
Posts: 254
Helped: 7
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14 Oct 2006 19:31 inductance meter pic |
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| blueroomelectronics guy....thank u for ur interest.....i do have a freq counter built on pic 16f72...i am using pic 16f72 for the lc meter tooo.....i am not getting the concept....i mean how the software works ....then i can write my own ....
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jonw0224
Joined: 22 Nov 2004
Posts: 199
Helped: 28
Location: USA
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18 Oct 2006 4:22 pic inductance meter |
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blueroomelectronics,
i have built the meter described at
http://ironbark.bendigo.latrobe.edu.au/~rice/lc/
using PIC16F84A with good results also.
roykyn,
Mr. Rice has a good explanation on how it works. Basically, a comparator is wired to be a free running oscillator (whose frequency is a function of the capacitor or inductor to be measured).
The PIC software implements a frequency counter. Mr. Rice has the source code on the website. He measures frequency by taking the input on RA4 and configures that pin to increment TIMER0 on the falling edge. He then waits a specific time and uses the change in TIMER0 to determine the frequency, converts it to a capacitor/inductor value, and displays it on the LCD. He has equations for the conversion from frequency to component value (for the oscillator used) on the website as well.
-Jonathan
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