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Review: High-precision L/C Inductance Capacitance meter (35-50 USD)

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vizer:
Has anyone tried out this eBay USB L/C meter?  :-\ The listing looks like this:  ???
Update High-precision L/C Inductance Capacitance meter,
one url is:
http://cgi.ebay.com/Update-High-precision-L-C-Inductance-Capacitance-meter-/190472431824?pt=LH_DefaultDomain_0&hash=item2c590aa8d0

(Note: Another model without range of Big capacitance costs less by 10-15 USD. ;))

Description (as claimed 8)):  
Measurement Accuracy: 1% (except for portions of ranges where it is up to 5% or more! ;D)
Capacitance measuring range: 0.01pF-10uF
Minimum resolution: 0.01pF
Inductance Range: 0.001uH-100mH
Minimum resolution: 0.001uH
Large inductance measurement range: 0.001mH-100H
Minimum resolution: 0.001mH
Large capacitance measuring range: 1uF-100mF
Minimum resolution: 0.01uF
Test Frequency: capacitors, inductors file of about 500kHz, a large inductance of about 500Hz,
          Can display the current value of the test frequency
Effective display digits: 4
Display: 1602 LCD
Power supply:Mini USB interface to take power
What's include?
       Update High-precision L/C Inductance Capacitance meter
       Short USB cable (some sellers may not include cable)

Mechatrommer:
i've been very bad at analog design. i saw something like this open schematiced online, but no open source code and no buy option. this is what i'm looking for, just buy ready made stuff, should i go along?
and let say if i manage to change/hack the mcu... is there any possiblity modding this analog circuit to esr as well? need an expert insight on this.

vizer:
Further capabilities for handling esr, usb communications, etc., are definitely desired and more than welcome. Qualified designers are definitely encouraged to look into such chores.

Until such further features appear, however, the existing capabilities allow some handy measurements that I haven't before had at so low cost. For example, hanging the unit off a usb port of my netbook displaying some coil equations and calculators, together with some wire and a small caliper, I've been easily exercizing the 4-5 inductance readings/sec. to become better acquainted with the inductance of many configurations of air-core coils. Adding various cores will surely contribute their own complications to explore. 

Bored@Work:

--- Quote from: shafri on November 30, 2010, 02:21:48 pm ---i've been very bad at analog design. i saw something like this open schematiced online, but no open source code and no buy option. this is what i'm looking for, just buy ready made stuff, should i go along?
and let say if i manage to change/hack the mcu... is there any possiblity modding this analog circuit to esr as well? need an expert insight on this.


--- End quote ---

These meters are easy to DIY. Here is one, including source code http://cappels.org/dproj/EvenBetterLCMeter/Even_Better_LC_Meter.html

Scroll down to the end to see with what construction technique the author got away (classic breadbording style).

vizer:
Very interesting reading. I would also like to find more detail on the accuracy and other limitations when such meters are in use as working  instruments.

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