LCX_UserManual_en_08_1.pdf - 第22页

Getting started R&S ® LCX Series 22 User Manual 1 179.2260.02 ─ 08 Replacing the external bias fuse The bias voltage input of the R&S LCX is protected by a fuse of type IEC 60127-2/5- F0.5L/250V (order no. 0009.5…

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Getting started
R&S
®
LCX Series
21User Manual 1179.2260.02 ─ 08
4.1.5 Considerations for test setup
Cable selection and electromagnetic interference (EMI)
Electromagnetic interference (EMI) can affect the measurement results.
To suppress electromagnetic radiation during operation:
●
Use high-quality shielded cables, especially for the following connector types:
– Connectors for external devices
Double-shielded data cables. The length of data cables must not exceed 3 m.
– Connectors for signal transmission
Shielded coaxial cables. The length of signal cables must not exceed 1 m.
We recommend that you use the R&S LCX-Z11 BNC-to-BNC extension (1 m)
from Rohde & Schwarz.
– BNC
Double-shielded BNC cables.
– USB
Double-shielded USB cables. The length of passive USB cables must not
exceed 1 m.
– LAN
At least CAT6+ cables
– IEEE-488 (GPIB)
Double-shielded cables. We recommend that you use the double-shielded
cable "R&S HZ72" from Rohde & Schwarz.
●
Always terminate open cable ends.
●
Ensure that connected external devices comply with EMC regulations.
Signal input and output levels
Information on signal levels is provided in the specifications document. Keep the signal
levels within the specified ranges to avoid damage to the product and connected devi-
ces.
4.1.6 Connecting to power
For safety information, see "Connecting to power" on page 11.
When using the R&S LCX the first time, you can skip Replacing the external bias fuse
and Replacing the line fuse.
If there are any problems during power-on or malfunction of the bias, check the condi-
tion of the mains fuse. Also check the fuse for the external bias input as described in
these instructions. They explain how to check and change the protective fuses, if nec-
essary.
Preparing for use
Getting started
R&S
®
LCX Series
22User Manual 1179.2260.02 ─ 08
Replacing the external bias fuse
The bias voltage input of the R&S LCX is protected by a fuse of type IEC 60127-2/5-
F0.5L/250V (order no. 0009.5463.00). The externally accessible fuse is at the rear
panel.
To check and exchange the external bias fuse:
1.
NOTICE! Risk of instrument damage. Malfunction of the fuse that protects the bias
voltage input from overload can damage the circuitry of the instrument.
Do not use either fuse type other than specified, nor a defective fuse, and never
short-circuit the fuse.
Make sure that you have disconnected the R&S LCX from the mains.
2. Check the condition of the external bias fuse.
3. If necessary, install the fuse type required for the external bias voltage.
a) Unscrew the fuse holder with a suitable screwdriver.
b) Pull out the fuse holder.
c) Replace the fuse by a fuse of the specified type.
d) Insert the fuse holder into the external bias inlet.
When inserting the fuse holder, press it slightly and tighten it.
Replacing the line fuse
The product is protected by one fuse of type IEC 60127-2/5-T2.0H/250V
(order no. 0020.7546.00). The externally accessible fuse is part of the IEC socket of
the power supply at the rear panel.
To exchange the line fuse:
1. Check the available supply voltage.
The mains voltage must be within the voltage range as denoted on the instrument.
The label is at the rear panel, on the left of the "AC power" connector and power
switch.
The power supply module covers a wide power supply range and normally does
not require adjustment.
2. If the power supply exceeds the permissible range, contact Rohde & Schwarz cus-
tomer service.
3.
WARNING! The fuse is part of the AC power supply. Handling the fuse while the
power is on can lead to electric shock.
If necessary, exchange the fuse required for the supply voltage.
4. Before changing the fuse:
a) Set the switch on the power supply to position [0].
b) Disconnect the R&S LCX from the power source.
5. Replace the line fuse.
a) Unplug the power cable.
Preparing for use
Getting started
R&S
®
LCX Series
23User Manual 1179.2260.02 ─ 08
b) Press the plastic lock on the bottom of the fuse holder inwards using a screw-
driver (with a blade width of approximately 2 mm).
A narrow guide on the bottom of the fuse holder denotes the insertion point.
When unlocking the mechanism, compression springs automatically push the
fuse holder outwards.
c) Pull out the fuse holder.
d) Check the condition of the fuse.
e) Replace the fuse by a fuse of the specified type.
A label next to the fuse holder also indicates the fuse type and its characteris-
tics.
f) Note: The protruding contact springs must not be deformed. Align the fuse
holder with the guide bar facing the socket.
Carefully slide the fuse holder against the spring pressure into the slot until the
plastic lock latches.
Connecting to power
To connect the instrument to the mains:
1. Check the available supply voltage.
The mains voltage must be within the voltage range as denoted on the instrument.
The label is at the rear panel, on the left of the "AC power" connector and power
switch.
The power supply module covers a wide power supply range and normally does
not require adjustment.
2. If the power supply exceeds the permissible range, contact Rohde & Schwarz cus-
tomer service.
3.
If necessary, ground the instrument using the grounding connection
.
A ground connector socket is at the front panel to connect a ground cable with a
banana plug.
As an alternative, a ground terminal at the rear panel enables you to connect a
ground cable firmly with a screw:
a) At the rear panel, unscrew the screw of the ground terminal using a cross-
recess screw driver.
b) Attach a ground cable with a ring terminal and pass the screw through it.
c) Fasten the screw.
d) Connect the cable to the ground.
4. Plug the AC power cable into the "AC power" connector.
The power supply switch connector is at the rear panel. Only use the power cable
delivered with the R&S LCX.
5. Plug the AC power cable into a power outlet with ground contact.
The required ratings are listed next to the AC connector and in the specifications
document.
Preparing for use