LCX_UserManual_en_08_1.pdf - 第64页

Measurement setups R&S ® LCX Series 64 User Manual 1 179.2260.02 ─ 08 a) Select the measurement pair softkey in the upper left corner , to open the selec- tion editor . b) Select the parameters "Lp-Rp" (par…

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Measurement setups
R&S
®
LCX Series
63User Manual 1179.2260.02 ─ 08
4. On the R&S LCX, select the capacitance measurement with the [C] key.
5. Configure the test signal.
6. 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-Rp" (parallel capacitance, parallel resistance).
c) Confirm you selection.
d) Repeat the steps to select the second parameters, e.g. select "Cp-D" (parallel
capacitance, dissipation factor).
7. To select the external voltage bias:
a) Press the [settings] key.
b) Select the "Measurement" tab.
c) Set the "Voltage Bias" to "Ext.".
8. Press the [home] key to return to the measurement window.
9. Set up the measurement of the capacitance as described, e.g. in "Measuring a
capacitor" on page 65.
10. To activate the voltage bias, press the [Bias Enable] key.
The lighting [Bias Enable] key indicates that bias is active.
6.3.3 Current bias
Option: R&S LCX-K108
When measuring inductances, it is often necessary to superimpose a current bias on
the test signal. You can set an internal current bias from 0 mA to 200 mA (DC), with a
resolution of 1 mA. An external current bias is not supported.
Discharging a current bias before power off
1.
NOTICE! Risk of instrument damage caused by overvoltage. When you power off
the instrument with the mains power switch, make sure that the bias current is fully
discharged.
When activated, deactivate the bias by pressing [Bias Enable] key.
A progress bar indicates that the discharging process is running.
2. Wait until the process has finished.
Setting a current bias
To bias an inductive component sample:
1. To select the inductance measurement (DUT component type), press the [L] key.
2. Configure the test signal.
3. To select the parameters for measurement results display:
Configuring BIAS
Measurement setups
R&S
®
LCX Series
64User Manual 1179.2260.02 ─ 08
a) Select the measurement pair softkey in the upper left corner, to open the selec-
tion editor.
b) Select the parameters "Lp-Rp" (parallel inductance, parallel resistance).
c) Confirm your selection.
d) Repeat the steps to select the second parameters, e.g. select "Lp-Q" (parallel
inductance, quality factor).
4. To set the current bias value:
a) Press the [Bias Level] key.
b) Enter a current value using the keypad on the screen.
5.
Confirm with
.
6. Set up the measurement of the inductance as described, e.g. in "Measuring an
inductor" on page 66.
7. To activate the current bias, press the [Bias Enable] key.
The lighting [Bias Enable] key indicates that bias is active.
Deactivating current bias
To turn off current bias:
1. Press the [Bias Enable] key.
The unlit [Bias Enable] key indicates that current bias is deactivated.
The R&S LCX starts the discharging process, as described in "Discharging a cur-
rent bias before power off" on page 63.
2. Wait for the inductor or coil to discharge before disconnecting.
3. Remove the component sample.
Configuring BIAS
Performing measurements
R&S
®
LCX Series
65User Manual 1179.2260.02 ─ 08
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.
Considerations on grounded DUTs
The R&S LCX operates on earth ground as reference. Therefore, it is not possible to
measure grounded DUTs.
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 "Basic measurement steps" on page 34, 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), see Section 6.1.2, "Kelvin clip lead", on page 54. To measure
this component sample, a DC voltage bias is necessary.
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).
4. Set the bias voltage according to the measurement requirements, see Section 6.3,
"Configuring BIAS", on page 61.
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".