LCX_UserManual_en_08_1.pdf - 第21页

Getting started R&S ® LCX Series 21 User Manual 1 179.2260.02 ─ 08 4.1.5 Considerations for test setup Cable selection and electromagnetic interference (EMI) Electromagnetic interference (EMI) can affect the measurem…

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Getting started
R&S
®
LCX Series
20User Manual 1179.2260.02 ─ 08
Prevent overheating as follows:
● Keep a minimum distance of 10 cm between the fan openings of the product
and any object in the vicinity to provide sufficient airflow and ventilation.
● Do not place the product next to heat-generating equipment such as radiators
or other products.
4.1.4.2 Mounting the R&S LCX in a rack
To prepare the rack
1. Observe the requirements and instructions in "Setting up the product" on page 10.
2.
NOTICE! Insufficient airflow can cause overheating and damage the product.
Design and implement an efficient ventilation concept for the rack.
Mounting the R&S LCX in a rack
To mount the R&S LCX in a rack:
1. Use an adapter kit that fits the dimensions of the R&S LCX to prepare the
R&S LCX for rack mounting.
a) Order the rack adapter kit designed for the R&S LCX. For the order number,
see the specifications document.
b) Mount the adapter kit. Follow the assembly instructions provided with the
adapter kit.
2. Lift the R&S LCX to shelf height.
3. Push the R&S LCX onto the shelf until the rack brackets fit closely to the rack.
4. Tighten all screws at the rack brackets with a tightening torque of 1.2 Nm to secure
the R&S LCX at the rack.
Unmounting the R&S LCX from a rack
To unmount the R&S LCX from a rack:
1. Loosen the screws at the rack brackets.
2. Bring the lifting equipment to shelf height.
3. Remove the R&S LCX from the rack.
4. If placing the R&S LCX on a bench top again, unmount the adapter kit from the
R&S LCX. Follow the instructions provided with the adapter kit.
Preparing for use
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