I measured the unknown inductor with two multimeters and they didn’t measure the same resistance,
0,21ohm (Fluke 28II)
0,065ohm (U1272A)
also, I design a schematic from a part of his PCB (image below). On the PCB silkscreen this component is marked as L1.
I have two queries:
1st: The “R” from the impedance’s equation isn’t the ohmic Resistance where should be independent from the frequency changing? For instance, a 10ohm resistor is 10ohm in all frequencies (in real even the resistors in high frequencies have a tiny inductance and capacitance as I know). I confused because the U1733C has a DRC (Direct Current Resistance) mode where it measures the resistance with 1Vdc (page 55 of the manual), so what is the reason (if I am right and the “R” isn’t change with frequency) to have a separate DRC measurement mode and in “R” mode to have the selection of the frequency(100Hz, 120Hz, 1KHz, 10KHz, 100KHz)?
2nd: My LCR in “Z” scale measures the Complex Impedance where is the sum of the Resistance “R” and the Reactive Component “jX”.
Z-R+jX, where:
X=Xc+XL
Xc=1/2*pi*f*C (Capacitive Component)
XL=2*pi*f*L (Inductive Reactance)
Just from curiosity, if I measure with my LCR meter the “Z”, “R”, ” L”, “C” e.g. at 1KHz, then can I calculate the Xc and XL values separate? Most expensive LCRs measures Xc & XL seperatly?
P.S. Thanks all of you for your replies and I apologize for my many queries.