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Measurement setups

R&S

LCX Series

59User Manual 1179.2260.02 ─ 02

For an example on how to configure the test signal parameters, see "Setting up the

test signal" on page 33.

6.3 Configuring BIAS

Referred to as biasing defines the method of superimposing a voltage or current on an

existing voltage/current to shift the operating point of an electronic component to a spe-

cific value.

With the bias function of the R&S LCX, you can predefine a working DC bias that cor-

responds to an expected supply voltage, or (current) in a circuit. The function enables

you, to measure the component sample under operating conditions, as expected for

the intended use.

Example: DC dependency of inductors

To measure the current flowing through an inductor under real conditions, e.g., in

power supplies, the current of approximately < 0.1 mA supplied by the R&S LCX is not

sufficient. To achieve higher current, the most common method is to superimpose the

AC with a DC current.

How to: "Setting a current bias" on page 61

Example: DC dependency of capacitors

Some capacitor types, e.g. electrolytic or tantalum capacitors, require a positive volt-

age bias to achieve accurate measurements of the component sample. To add the

bias, you can use either the internal bias source, or supply the bias externally, e.g.

using a power supply.

How to: "Setting an external voltage bias" on page 60

6.3.1 Internal bias voltage

Setting an internal voltage bias

To bias a capacitive component sample:

1. To select the capacitance measurement (DUT component type), press the [C] key.

2. Configure the test signal.

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) Confirm you selection.

d) Repeat the steps to select the second parameters, e.g. select "Cp-Rp" (parallel

capacitance, parallel resistance).

4. To set the voltage bias value:

Configuring BIAS

R&S LCX Series User Manual

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