LCX_UserManual_en_08_1.pdf - 第34页

Getting started R&S ® LCX Series 34 User Manual 1 179.2260.02 ─ 08 4.3 T rying out the instrument As a brief introduction, the following example describes the basic steps to be taken when setting up a measurement. Th…

100%1 / 265
Getting started
R&S
®
LCX Series
33User Manual 1179.2260.02 ─ 08
Power supply connector for connecting the R&S LCX to the mains., see Sec-
tion 4.1.6, "Connecting to power", on page 21.
Ground terminal
Protective ground terminal to secure the R&S LCX, e.g. with a grounded external con-
ductor, see Table 1-1.
Digital I/O
15-pole D-Sub socket to connect the binning interface.
External Voltage Bias
4 mm safety sockets for external bias voltage.
Note: External BIAS requires a constant voltage.
Before applying the voltage, make sure that you have set the constant voltage mode in
the supplying instrument. Refer to the user manual of the power supply.
The External Voltage Bias socket is not directly connected to the ground.
Indirectly, there is a connection to ground with low impedance over the "H CUR" output
buffer.
When the bias voltage is turned on, the potential to ground deviates only by a maxi-
mum of ±18 V. Without external bias, make sure that the voltage at the two sockets
does not exceed the safety extra-low voltage or the specified 40 V DC.
BIAS Fuse
Socket for the fuse securing the external bias voltage.
Trigger Input
BNC socket for external trigger signal.
The outer conductor of the trigger input is directly connected to the mains safety
ground by the line cord.
USB A
Female USB (universal serial bus) connector of type A (host USB). You can connect a
USB memory stick, e.g., to record and export measurement data, to capture screen-
shots, or to update the firmware.
How to: Section 4.1, "Preparing for use", on page 18
USB B
Female USB (universal serial bus) type B connector. This interface provides remote
control of the instrument from a controller PC.
See "Establishing a USB remote control connection" on page 168.
LAN
RJ-45 socket to connect the R&S LCX to a LAN for remote control, remote operation,
and data transfer.
How to: Section 4.1.7, "Connecting to LAN", on page 24
Instrument tour
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
1.
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.
3.
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.
e)
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.
c)
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.
c)
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