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Seeking understanding of what an LCR meter can measure beyond L, C, and R

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The Electrician:

--- Quote from: ballsystemlord on May 28, 2023, 11:45:58 pm ---Thanks, guys. That just leaves the last one:
Is Rac (Resistance AC) just another way of saying Xc/Xl (e.g. Marketing had the idea of calling it Rac), or is it some special other measurement?
(I give a link with examples in the OP.)

Unless  you have anything to add regarding the other 2:
https://www.eevblog.com/forum/testgear/seeking-understanding-of-what-an-lcr-meter-can-measure-beyond-l-c-and-r/msg4883012/#msg4883012

--- End quote ---

Most of the high end LCR meters don't use the term Rac.  The usual term is Rs, which is the resistive part of the series equivalent model.  Rp is the resistive part of the parallel equivalent model.  Rac and Rs and ESR are the same thing.

Here is a list of what the Keysight E4980A can display.  The E4980A is a very high end LCR meter currently available from Keysight:

Martin72:

--- Quote ---Is Rac (Resistance AC) just another way of saying Xc/Xl (e.g. Marketing had the idea of calling it Rac), or is it some special other measurement?
--- End quote ---

It was a few decades ago, but I had once learned that the impedance is the AC resistance.

mawyatt:
Impedance is usually referred to as Z, and a complex number as R +jX, where X is the Reactance and + for Inductive and - for Capacitive. R of course is the Real part and Resistance.

Also note that X can not dissipate energy, only R can do this, so the "Loss" in an Impedance Z is solely due to the Real part R.

Best,

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