Performing measurements
R&S
®
LCX Series
65
User Manual 1179.2260.02 ─ 02
L CUR
open
secondary
primary
H CUR
H POT
L POT
Figure 7-1: Primary inductance measurement
a) Connect the test leads of the corresponding circuit to one circuit of the sample
transformer.
b) Leave the second circuit of the transformer open.
This measurement on the transformer, also considered as "open" measurement,
corresponds to the measurement of a single coil, and the R&S
LCX displays the
parameters accordingly.
Measuring the mutual inductance of a transformer
This example refers to a measurement of a transformer with the test fixture (R&S
LCX-
Z5).
To measure the mutual inductance, you can proceed the same way as for the induc-
tance measurement by connecting the second transformer winding.
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 circuit:
a) Connect the test leads of the corresponding circuit to the primary circuit of the
sample transformer.
b) Connect the second test leads pair to the secondary circuit of the sample trans-
former.
The measurement starts and you can see the readings on the screen.
The R&S
LCX calculates a
virtual
impedance (complex parameters):
Figure 7-2: Virtual impedance
Z = virtual impedance
V
s
= voltage in secondary circuit
I
p
= current in primary circuit
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