Performing measurements
R&S
®
LCX Series
63
User Manual 1179.2260.02 ─ 02
7
Performing measurements
Using the R&S
LCX and the corresponding test fixture, you can measure various com-
ponent types. The following description explains how to proceed for measuring the typ-
ical components and what to consider.
Prerequisite of each measurement is the correction of the measurement setup to com-
pensate stray capacities, residual inductances and residual resistances of test fixtures,
leads and terminals. Therefore, the first steps are the open and short circuit correction,
to minimize the measurement errors.
We assume that you have set up your measurement and aligned the instrument as
described, e.g. in
on page 32, including the example for
measuring a resistor.
If there are specific steps to consider for measurements of certain components, we
explicitly point them out in the corresponding descriptions.
Measuring a capacitor
This example refers to a measurement of a capacitor of 1000
µF, by using the Kelvin
clip lead (R&S
LCX-Z2). To measure this component sample, a DC voltage bias is nec-
essary.
1. To select the capacitance measurement (DUT component type), press the [C] key.
2. Set the measurement frequency of the test signal, e.g., 1
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 "Cp-D" (parallel capacitance, dissipation factor).
c) Repeat the steps to select the second parameters, e.g. select "Cp-Rp" (parallel
capacitance, parallel resistance).
Note:
In automatic mode, the LCX selects the "C-D" parameter automatically.
4. Set the bias voltage according to the measurement requirements, see
5. Connect the sample capacitor to the terminals of the test fixture:
a) Connect the black terminal to the negative (-) terminal of the capacitor.
b) Accordingly, connect the positive (+) terminal.
The measurement starts and you can see the readings on the screen.
As the preselected frequency of 1
kHz does not match to the intended working
point of the capacitor, the measurement result shows approximately only "Cp
≈
900
µF".
6. To achieve the expected result, set the frequency to 50
Hz.
The expected value is approximately 1000
µF
±
tolerance. The dissipation factor
"D" is low, even close to 0, and the phase angle is
≈
-87°.
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