Electronics > Projects, Designs, and Technical Stuff
ESR meter
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tigr:
Less than 0.01 Ohm.
 For example.
Rubycon ZLG Ultra Low Impedance 1000uF/35v.Max.impedance-0,012Ohm.
http://www.rubycon.co.jp/en/catalog/e_pdfs/aluminum/e_ZLG.pdf
kripton2035:

--- Quote from: tigr on January 03, 2018, 08:28:43 pm ---Less than 0.01 Ohm.

--- End quote ---
then you need 4-wires measurement, and this circuit is only 2-wires. you won't get these small values with it.
tigr:
2-wires
4-wires
We see that there is no difference. ;)
The Electrician:

--- Quote from: tigr on January 03, 2018, 10:47:50 pm ---2-wires
4-wires
We see that there is no difference. ;)

--- End quote ---

There is no difference when the two "wires" are the very short and thick blades on a tweezer type LCR meter as you show.  That's not what Kripton2035 is talking about.  The project you are planning to build has a couple of banana plugs on the project box connect with ordinary wires inside the box.  Those wires probably have a resistance of several milliohms which will add to the measured ESR unless some method is provided for compensating.  Using a 4 wire connection is the standard way of solving the problem of lead resistance.

Why are you going to build this project when you already have a tweezer LCR meter?  Doesn't the tweezer meter use a sine wave for excitation?
tigr:

--- Quote from: The Electrician on January 05, 2018, 03:48:37 am ---Why are you going to build this project when you already have a tweezer LCR meter?  Doesn't the tweezer meter use a sine wave for excitation?

--- End quote ---
I'm interested in a circuit without a transformer. Yes, I have almost a sinusoidal signal.
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