Performing measurements
R&S
®
LCX Series
64
User Manual 1179.2260.02 ─ 02
Decreasing the frequency reduces the loss angle, and thus the real components
come closer to the ideal value.
Measuring an inductor
This example refers to a measurement of an inductor of 280
µH on a printed circuit
board, by using the miniature SMD tweezers (R&S
LCX-Z4).
1. To select the inductance measurement (DUT component type), press the [L] key.
2. Set the measurement frequency of the test signal, e.g., 500
kHz.
3. To select the parameters for measurement results display:
a) Select the measurement pair softkey in the upper left corner, to open the selec-
tion editor.
b) Select the parameters "Ls-Q" (serial inductance, quality factor).
c) Repeat the steps to select the second parameters, e.g. select "Z-
Θ
" (impe-
dance, phase angle).
4. Carefully contact the miniature tweezers of the test fixture to the sample inductor
on the circuit board.
5. Hold the tweezers closed during measurement.
The measurement starts and you can see the readings on the screen.
The expected result is approximately "Ls
≈
280
µH"
±
tolerance. The phase angle
"Z-
Θ
"
≈
+70°.
Measuring the inductance of a transformer
This example refers to a measurement of a transformer with the test fixture (R&S
LCX-
Z5).
A transformer measurement often leads to varying measurement results due to iron
core losses and to the unknown state of the premagnetized core. The sample compo-
nent depends on both, the frequency and the measurement voltage. Varying the fre-
quency causes changes in magnetization and iron core losses, which impact the phase
angle, and an increasing measurement voltage leads to higher impedance.
To measure the inductance:
1. To select the transformer measurement (DUT component type), press the
[Transformer] key.
2. To select the parameters for measurement results display:
a) Select the measurement pair softkey in the upper left corner, to open the selec-
tion editor.
b) Select the parameters "N-
Θ
d" (transformer ratio, phase angle).
c) Repeat the steps to select the second parameters, e.g. select "M-
Θ
d" (induc-
tance, phase angle).
3. To measure the parameters of a transformer coil:
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