EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Tommy1984 on September 10, 2017, 09:04:20 am
-
Hello everyone,
I have LCR400 Voltcraft http://www.conrad.com/ce/en/product/1301292/Component-tester-digital-VOLTCRAFT-LCR-400-Calibrated-to-Manufacturer-standards-CAT-I-Display-counts-20000?ref=searchDetail (http://www.conrad.com/ce/en/product/1301292/Component-tester-digital-VOLTCRAFT-LCR-400-Calibrated-to-Manufacturer-standards-CAT-I-Display-counts-20000?ref=searchDetail)
User manual: http://www.produktinfo.conrad.com/datenblaetter/1300000-1399999/001301292-an-01-ml-VOLTCRAFT_LCR_400_KOMPONENTE_de_en_fr_nl.pdf (http://www.produktinfo.conrad.com/datenblaetter/1300000-1399999/001301292-an-01-ml-VOLTCRAFT_LCR_400_KOMPONENTE_de_en_fr_nl.pdf)
As it's mentioned in the user manual the LCR meter can measure impedance from 0.001uH to 20KH....
I have tried to measure many different inductors with many different value (from 0.03uH to 0.440uH), but, it shows fail values!
As the user manual says, the measuring frequency for the rang 20uH must be 100KHz (there's nothing about less than 20uH).
Anyway, I have tried many frequencies, but, without any luck! Even in series or parallel, got nothing right or even a little close to the real values which should be |O |O |O
Anyone has an idea what's going on or why I got that?
Any help or tip is a very appropriated!
Tommy
-
I am not sure how you know your meter measures wrong values.
Maybe you could try this calculator https://www.eeweb.com/toolbox/wire-inductance (https://www.eeweb.com/toolbox/wire-inductance), calculate yourself 10cm 1mm wire (or whatever length and diameter wire) and measure it with your meter, if values are similar?
Even DE-5000 struggles sometimes with very small inductances ;) https://www.eevblog.com/forum/testgear/strange-behaviour-with-my-de-5000/ (https://www.eevblog.com/forum/testgear/strange-behaviour-with-my-de-5000/)
-
I am not sure how you know your meter measures wrong values.
Maybe you could try this calculator https://www.eeweb.com/toolbox/wire-inductance (https://www.eeweb.com/toolbox/wire-inductance), calculate yourself 10cm 1mm wire (or whatever length and diameter wire) and measure it with your meter, if values are similar?
Even DE-5000 struggles sometimes with very small inductances ;) https://www.eevblog.com/forum/testgear/strange-behaviour-with-my-de-5000/ (https://www.eevblog.com/forum/testgear/strange-behaviour-with-my-de-5000/)
Thank you for your reply!
I knew that were values because as I said, whatever the values were (0.03 - 0.440uH) the LCR-meter showed values between 0.07 and 0.085 uH.
The inductors which I measured were labeled. So that's why!
Tommy
-
Why the double post? :-//
https://www.eevblog.com/forum/testgear/small-impedance-inductors-mesurments-with-lcr-meter-problem!/ (https://www.eevblog.com/forum/testgear/small-impedance-inductors-mesurments-with-lcr-meter-problem!/)