LCX_UserManual_en_08_1.pdf - 第35页

Getting started R&S ® LCX Series 35 User Manual 1 179.2260.02 ─ 08 a) Press the [settings] key at the front panel. On the front panel, press the [settings] button. b) In the "Device" tab, select "Save/…

Getting started

R&S

LCX Series

34User Manual 1179.2260.02 ─ 08

4.3 Trying out the instrument

As a brief introduction, the following example describes the basic steps to be taken

when setting up a measurement. The instructions guide you through the measurement

of a resistor.

Further test setups and measurement methods are described in the user manual, see

Section 6, "Measurement setups", on page 53.

The test setup uses the R&S LCX-Z3 SMD test fixture connected to the R&S LCX for

measuring leadless components.

If necessary, you can connect the R&S LCX-Z11 BNC-to-BNC extension between the

R&S LCX and the test fixture, e.g., to make it easier to pick and place the DUTs.

Basic measurement steps

The R&S LCX LCR meter measures the impedance and phase angle with an AC sig-

nal, and derives the required characteristics.

As the equivalent circuit of each DUT contains capacitive, real and conductive parts,

the characteristics of passive components vary dependent on frequency, level, temper-

ature and additional bias. Even the test equipment can impact the measurement

results. Therefore, we recommend that you use the test fixture that fits best for your

application, and align the instrument on all frequencies. Keep the order as given to

minimize parasitic parts and thus to optimize the measurement accuracy.

1. Select the test fixture that fits best for your application.

2. After power-on set the R&S LCX to an initial state, see "Setting the initial state"

on page 34.

3. Connect the test fixture, see Section 4.1.9, "Connecting a test fixture", on page 25.

4. Configure the test signal, see "Setting up the test signal" on page 35.

5. Align the instrument on all frequencies, see "Aligning the instrument on all frequen-

cies" on page 36.

6. Start a resistor measurement "Measuring a resistor" on page 36.

Setting the initial state

NOTICE! Check all terminals to make sure that they are not damaged.

Power on the R&S LCX as described in Section 4.1.6, "Connecting to power",

on page 21.

2. Switch on the R&S LCX, see Section 4.1.10, "Switching on or off", on page 27.

NOTICE! Risk of measurement inaccuracy. Measurements can be inaccurate, if

performed when the instrument is not warmed-up. Wait until the instrument has

reached its operating temperature before you start the measurement procedure.

The warm-up time is up to 30 minutes.

To start from an initial state, set the instrument to default:

Trying out the instrument

Getting started

R&S

LCX Series

35User Manual 1179.2260.02 ─ 08

a) Press the [settings] key at the front panel.

On the front panel, press the [settings] button.

b) In the "Device" tab, select "Save/Recall Device Settings".

c) Select "Default Settings".

The instrument prompts you to confirm the operation.

d) Confirm with "Ok".

The R&S LCX resets all parameters except for system settings.

Select

to return to the settings menu.

Connecting the test fixture

The figure shows schematically the elements to be connected.

► To connect the test fixture, proceed as described in Section 4.1.9, "Connecting a

test fixture", on page 25.

Setting up the test signal

To configure the test signal:

1. To set the frequency:

a) On the screen, select "Frequency".

b) Enter, e.g. 10 kHz using the keypad on the screen.

Confirm with

2. To select the level parameter:

Before setting the test signal level, you can select either the signal voltage, or the

signal current for the level setting:

a) Press the [settings] at the front panel.

b) Select the "Measurement" tab.

c) Select "Test Signal Level".

d) Select, e.g. "Voltage".

e) Confirm with "Set".

f) Press the [home] key to return to the measurement window.

The R&S LCX provides the selected parameter for the level setting on the screen.

3. To set the test signal level:

a) On the screen, select "Level".

b) Enter, e.g. 1.3 VRMS.

Confirm with

4. If you know the expected range, set the range as follows.

Otherwise skip this step and proceed with step 5:

a) Select "Range".

b) In the "Select Measurement Range" dialog, select the expected impedance,

e.g. 10 kΩ.

c) Confirm with "Set".

Trying out the instrument

Getting started

R&S

LCX Series

36User Manual 1179.2260.02 ─ 08

5. On the front panel, press the [Auto] key to enable automatic detection of the mea-

surement function according to the component type of the DUT.

Aligning the instrument on all frequencies

To compensate impacts and measurement errors, you can align the instrument on all

frequencies before starting the measurement.

This example describes how to execute a short and an open correction with the con-

nected SMD test fixture (R&S LCX-Z3).

During the correction procedure, the R&S LCX sweeps through defined frequency

steps that are determined by the selected source impedance and the correction mode.

For information on the frequency steps, see Table 8-1.

1. Press the [Comp.] key at the front panel.

The "Open/Short/Load Correction" dialog opens.

2. Execute a short correction:

a) Short-circuit the contact devices, i.e. the clamps or pins, according to the used

test fixture.

b) In the "Open/Short/Load Correction" dialog, select "Short correction".

c) Set "Enabled" > "ON".

d) Select "Start Short Correction (Full)".

The short correction takes about 2 minutes.

3. Execute an open correction:

a) Open the contact devices.

Depending on the test fixture, take care that you set the required position.

For example, Kelvin clamps require the same position as expected for the mea-

surement, or the spacing between SMD pins must correspond to the size of the

measurement sample.

b) In the "Open/Short/Load Correction" dialog, select "Open correction".

c) Set "Enabled" > "ON".

d) Select "Start Open Correction (Full)".

The open correction also lasts for about 2 minutes.

Note: For information on corrections with other test fixtures, see Section 6.1,

"About test fixtures", on page 53.

Measuring a resistor

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

2. To select the parameters for measurement results display:

a) Select the softkey in the upper left corner, to open the selection editor.

b) Select the parameters "R-X" (resistance, reactance).

c) Repeat the steps to select the second parameters, e.g. select "Z-Θ" (impe-

dance, phase angle).

Trying out the instrument