Rohde&Schwarz OSP Getting Started

Brand: Rohde&Schwarz

Model: OSP

Type: Getting Started

R&S®OSP

Open Switch and Control

Platform

Getting Started

1178711702

Version 10

(;ÜÕA2)

The R&S®OSP is a high-performance switch platform from Rohde & Schwarz. It

facilitates RF tests by eliminating the need to rearrange coaxial cable connections

repeatedly during measurements. Instead, the application-specific modules in the

base unit automatically switch the required signal paths.

This document describes the following R&S®OSP base units with firmware ver-

sion 2.50 and later:

●R&S®OSP220 Base Unit 2HU without Touchscreen (order no. 1528.3105.02)

●R&S®OSP230 Base Unit 2HU with Touchscreen (order no. 1528.3105.03)

●R&S®OSP320 Base Unit 3HU without Touchscreen (order no. 1528.3111.02)

●R&S®OSP-B200S2 Satellite 2HU for Base Units (order no. 1528.3134.02/.04)

For all optionally available standard switch modules, refer to the user manual,

which is available for download at https://www.rohde-schwarz.com/product/osp-n

> Manuals

The software contained in this product uses several valuable open source software packages. For infor-

mation, see the "Open Source Acknowledgment" document, which is available for download from the

R&S OSP product page at https://www.rohde-schwarz.com/product/osp-n > Firmware.

Rohde & Schwarz would like to thank the open source community for their valuable contribution to embed-

ded computing.

Muehldorfstr. 15, 81671 Muenchen, Germany

Phone: +49 89 41 29 - 0

Email: [email protected]

Internet: www.rohde-schwarz.com

Subject to change – data without tolerance limits is not binding.

R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.

The terms HDMI, HDMI High-Definition Multimedia Interface, HDMI trade dress and the HDMI Logos are

trademarks or registered trademarks of HDMI Licensing Administrator, Inc.

All other trademarks are the properties of their respective owners.

1178.7117.02 | Version 10 | R&S®OSP

In this manual, products from Rohde & Schwarz are indicated without the ® symbol, e.g. R&S®OSP is indi-

cated as R&S OSP.

Contents

R&S®OSP

3Getting Started 1178.7117.02 ─ 10

Contents

1 Safety and regulatory information....................................... 5

1.1 Korea certification class B...................................................................5

1.2 Safety instructions................................................................................6

1.3 Labels on the product.......................................................................... 8

1.4 Warning messages in the documentation.......................................... 9

1.5 Restrictions on opening a switch unit................................................ 9

1.6 Safety considerations for SSRs........................................................ 10

2 Key features......................................................................... 11

3 Documentation overview.................................................... 12

3.1 Getting started manual.......................................................................12

3.2 User manual........................................................................................ 12

3.3 Data sheets and brochures................................................................12

3.4 Service manual....................................................................................13

3.5 Printed safety instructions.................................................................13

3.6 Instrument security procedures........................................................ 13

3.7 Release notes, open source acknowledgment................................ 13

3.8 Application notes & cards, white papers, etc.................................. 14

3.9 Tutorials............................................................................................... 14

4 Preparing for use................................................................. 15

4.1 Lifting and carrying............................................................................ 15

4.2 Unpacking and checking....................................................................16

4.3 Choosing the operating site.............................................................. 16

4.4 Setting up the product........................................................................17

4.5 Accessory list......................................................................................19

Contents

R&S®OSP

4Getting Started 1178.7117.02 ─ 10

4.6 Considerations for test setups.......................................................... 19

4.7 Connecting to power.......................................................................... 21

4.8 Connecting to LAN............................................................................. 21

4.9 Connecting monitor, mouse and keyboard...................................... 22

4.10 Connecting RF cables........................................................................ 22

4.11 Connecting control cables.................................................................23

4.12 Switching on or off............................................................................. 23

4.13 Checking the installed modules........................................................ 25

4.14 Configuring the initial instrument settings...................................... 26

5 Instrument tour.................................................................... 27

5.1 Front panel view..................................................................................27

5.2 Rear panel view...................................................................................31

6 Trying out the switch unit................................................... 35

6.1 Manual and remote modes of operation...........................................35

6.2 User interface and functional elements............................................37

6.3 Main action buttons............................................................................ 40

6.4 Elements of the status bar................................................................. 41

6.5 Manual module operation: switching / selecting............................. 41

6.6 Contacting customer support............................................................44

Safety and regulatory information

R&S®OSP

5Getting Started 1178.7117.02 ─ 10

1 Safety and regulatory information

The product documentation helps you use the product safely and efficiently. Fol-

low the instructions provided here and in the following chapters.

Intended use

The R&S OSP is designated for switching and control applications, including RF

switching, in industrial, administrative, and laboratory environments. Use the

R&S OSP only for its designated purpose.

Observe the operating conditions and performance limits stated in the data sheet.

Target audience

This document is targeted at all users, including installers, operators, and mainte-

nance personnel.

Where do I find safety information?

Safety information is part of the product documentation. It warns you of potential

dangers and gives instructions on how to prevent personal injury or damage

caused by dangerous situations. Safety information is provided as follows:

●In Chapter 1.2, "Safety instructions", on page 6. The same information is

provided in many languages as printed "Safety Instructions". The printed

"Safety Instructions" are delivered with the product.

●Throughout the documentation, safety instructions are provided when you

need to take care during setup or operation.

1.1 Korea certification class B

이 기기는 가정용(B급) 전자파 적합기기로서 주로 가정에서 사용하는 것을 목적으

로 하며, 모든 지역에서 사용할 수 있습니다.

Korea certification class B

Safety and regulatory information

R&S®OSP

6Getting Started 1178.7117.02 ─ 10

1.2 Safety instructions

Products from the Rohde & Schwarz group of companies are manufactured

according to the highest technical standards. To use the products safely, follow

the instructions provided here and in the product documentation. Keep the prod-

uct documentation nearby and offer it to other users.

Use the product only for its intended use and within its performance limits. Inten-

ded use and limits are described in the product documentation such as the data

sheet, manuals and the printed "Safety Instructions". If you are unsure about the

appropriate use, contact Rohde & Schwarz customer service.

Using the product requires specialists or specially trained personnel. These users

also need sound knowledge of at least one of the languages in which the user

interfaces and the product documentation are available.

Reconfigure or adjust the product only as described in the product documentation

or the data sheet. Any other modifications can affect safety and are not permitted.

Never open the casing of the product. Only service personnel authorized by

Rohde & Schwarz are allowed to repair the product. If any part of the product is

damaged or broken, stop using the product. Contact Rohde & Schwarz customer

service at https://www.rohde-schwarz.com/support.

Lifting and carrying the product

The maximum weight of the product is provided in the data sheet. You can lift or

carry the product by yourself, if you can manage the weight on your own. Alterna-

tively, you can use lifting or transporting equipment. Follow the instructions provi-

ded by the equipment manufacturer.

Choosing the operating site

Only use the product indoors. The product casing is not waterproof. Water that

enters can electrically connect the casing with live parts, which can lead to elec-

tric shock, serious personal injury or death if you touch the casing. If

Rohde & Schwarz provides accessories designed for your product, e.g. a carrying

bag, you can use the product outdoors.

Unless otherwise specified, you can operate the product up to an altitude of

2000 m above sea level. The product is suitable for pollution degree 2 environ-

ments where nonconductive contamination can occur. For more information on

Safety instructions

Safety and regulatory information

R&S®OSP

7Getting Started 1178.7117.02 ─ 10

environmental conditions such as ambient temperature and humidity, see the

data sheet.

Setting up the product

Always place the product on a stable, flat and level surface with the bottom of the

product facing down. If the product is designed for different positions, secure the

product so that it cannot fall over.

If the product has foldable feet, always fold the feet completely in or out to ensure

stability. The feet can collapse if they are not folded out completely or if the prod-

uct is moved without lifting it. The foldable feet are designed to carry the weight of

the product, but not an extra load.

If stacking is possible, keep in mind that a stack of products can fall over and

cause injury.

If you mount products in a rack, ensure that the rack has sufficient load capacity

and stability. Observe the specifications of the rack manufacturer. Always install

the products from the bottom shelf to the top shelf so that the rack stands

securely. Secure the product so that it cannot fall off the rack.

Connecting to power

The product is an overvoltage category II product. Connect the product to a fixed

installation used to supply energy-consuming equipment such as household

appliances and similar loads. Keep in mind that electrically powered products

have risks, such as electric shock, fire, personal injury or even death. Replace

parts that are relevant to safety only by original parts, e.g. power cables or fuses.

Take the following measures for your safety:

●Before switching on the product, ensure that the voltage and frequency indica-

ted on the product match the available power source. If the power adapter

does not adjust automatically, set the correct value and check the rating of the

fuse.

●Only use the power cable delivered with the product. It complies with country-

specific safety requirements. Only insert the plug into an outlet with protective

conductor terminal.

●Only use intact cables and route them carefully so that they cannot be dam-

aged. Check the power cables regularly to ensure that they are undamaged.

Also ensure that nobody can trip over loose cables.

Safety instructions

Safety and regulatory information

R&S®OSP

8Getting Started 1178.7117.02 ─ 10

●If you connect the product to an external power supply, use the one delivered

with the product or recommended in the product documentation. The external

power supply must conform to the country-specific regulations.

●Only connect the product to a power source with a fuse protection of maxi-

mum 20 A.

●Ensure that you can disconnect the product from the power source at any

time. Pull the power plug to disconnect the product. The power plug must be

easily accessible. If the product is integrated into a system that does not meet

these requirements, provide an easily accessible circuit breaker at the system

level.

Cleaning the product

Use a dry, lint-free cloth to clean the product. When cleaning, keep in mind that

the casing is not waterproof. Do not use liquid cleaning agents.

Meaning of safety labels

Safety labels on the product warn against potential hazards.

Potential hazard

Read the product documentation to avoid personal injury or product damage.

Electrical hazard

Indicates live parts. Risk of electric shock, fire, personal injury or even death.

Hot surface

Do not touch. Risk of skin burns. Risk of fire.

Protective conductor terminal

Connect this terminal to a grounded external conductor or to protective ground. This

connection protects you against electric shock if an electric problem occurs.

1.3 Labels on the product

Labels on the casing inform about:

●Personal safety, see "Meaning of safety labels" on page 8

●Product and environment safety, see Table 1-1

●Identification of the product, for example as in the top left of Figure 5-1

Labels on the product

Safety and regulatory information

R&S®OSP

9Getting Started 1178.7117.02 ─ 10

Table 1-1: Labels regarding product and environment safety

Potential hazard

Read the product documentation to avoid personal injury or product damage.

China RoHS certification, certifies compliance with the Chinese government's regula-

tion on the restriction of hazardous substances (RoHS).

Labeling in line with EN 50419 for disposal of electrical and electronic equipment after

the product has come to the end of its service life. See "Disposal" in the user manual.

1.4 Warning messages in the documentation

A warning message points out a risk or danger that you need to be aware of. The

signal word indicates the severity of the safety hazard and how likely it will occur

if you do not follow the safety precautions.

WARNING

Potentially hazardous situation. Could result in death or serious injury if not avoi-

ded.

CAUTION

Potentially hazardous situation. Could result in minor or moderate injury if not

avoided.

NOTICE

Potential risks of damage. Could result in damage to the supported product or to

other property.

1.5 Restrictions on opening a switch unit

Do not open an R&S OSP, to avoid personal injury and instrument damage.

●If opening is required for mounting a module, let Rohde & Schwarz service

personnel mount this module.

●If opening is not required, follow the mounting instructions in the user manual.

Restrictions on opening a switch unit

Safety and regulatory information

R&S®OSP

10Getting Started 1178.7117.02 ─ 10

1.6 Safety considerations for SSRs

Risk of injury and damage due to inappropriate SSR usage

At power loss, solid-state relays (SSRs) have no defined switching state. Hence,

other than an electromechanical monostable relay, if there is a malfunction (for

example, missing supply voltage), typically the SSR ports go to a high-impedance

state. But the relay does not actively switch off a connected load. This failure can

lead to a risk of personal injury and damage of equipment.

To prevent this risk, you must implement a dedicated concept for failsafe opera-

tion of your system in a competent manner.

Risk of damage due to inappropriate SSR usage

Solid-state relays (SSRs) are intended for high-frequency and high-speed switch-

ing, but their semiconductor elements are damaged easily by excess current, volt-

age peaks or a short circuit. Hence, inappropriate conditions or usage can dam-

age SSRs or connected components and lead to associated problems.

To prevent this risk, avoid excess current, voltage peaks and short circuits.

Risk of SSR damage due to inappropriate operating conditions

Solid-state relays (SSRs) for RF applications are intended for switching low pow-

ers. To avoid damage due to overload, refer to the operating conditions according

to the data sheet.

Monostable vs. failsafe

Without power, a solid-state relay (SSR) quits operating as a switch:

●It is in a non-defined high-impedance state

●It does not have any stable switching state

Sometimes, SSRs are considered as behaving like a monostable relay. And the

term "monostable relay" is often considered to be equivalent with the term "fail-

safe relay". However, this interpretation is misleading.

For more information, refer to the user manual.

Safety considerations for SSRs

Key features

R&S®OSP

11Getting Started 1178.7117.02 ─ 10

2 Key features

The R&S OSP is a highly flexible, modular switch and control platform. Each

switch unit can be equipped with several application-specific switch modules.

The platform meets the requirements of diverse test scenarios in production, labs

and development environments. Scenarios range from desktop configurations for

laboratory measurements to complex, rack-integrated test systems.

The R&S OSP220/230/320 described in this manual are the second generation of

switch units from Rohde & Schwarz, replacing the R&S OSP120/130/150.

Outstanding key features are:

●5 to 10 module slots and up to 16 module buses provide maximum flexibility

●Fast setup of test and measurement configurations

●Replace complex wirings by a single switch and control platform

●Easy interconnection configuration of primary and secondary switch units

●Optional installation of several remotely controlled satellite units (see p. 29)

●Reliable measurements and reproducible tests

●Automation for cost-efficient test sequences

●Electromechanical relay modules up to 67 GHz

●Solid-state relay modules with switching and settling times down to the µs

range

●Backward compatible to all standard modules of the previous switch unit gen-

eration R&S OSP120/130/150, as described in the user manual

The available switch modules are described in the user manual.

For a detailed specification of the R&S OSP, refer to the data sheet, available for

download at www.rohde-schwarz.com/brochure-datasheet/osp-n.

Note that switch units are no measurement instruments. They support effi-

cient working with test and measurement setups, but switch units do not dis-

play measurement results or power levels.

Documentation overview

R&S®OSP

12Getting Started 1178.7117.02 ─ 10

3 Documentation overview

This section provides an overview of the R&S OSP user documentation. Unless

specified otherwise, you find the documents at:

www.rohde-schwarz.com/product/osp-n

3.1 Getting started manual

Introduces the R&S OSP and describes how to set up and start working with it.

Includes, e.g., basic operations and safety instructions. A printed version is deliv-

ered with the switch unit. A PDF version is available for download at www.rohde-

schwarz.com/manual/osp-n. Also, you can download it from the switch unit during

"WebGUI" control at "Main" > "Context Menu" > "Downloads...".

3.2 User manual

Contains the description of all switch unit modes and functions. It also provides

an introduction to remote control, a complete description of the remote control

commands with programming examples, and information on maintenance, interfa-

ces and error messages. Includes the contents of the getting started manual.

A PDF version is available for download at www.rohde-schwarz.com/manual/osp-

n. Also, you can download it from the switch unit during "WebGUI" control at

"Main" > "Context Menu" > "Downloads...".

A separate R&S OSP-B200R/B200S2 Satellite System user manual is also avail-

able for download at www.rohde-schwarz.com/manual/osp-n.

3.3 Data sheets and brochures

The data sheet contains the technical specifications of the R&S OSP. It also lists

the firmware applications and their order numbers, and optional accessories.

The brochure provides an overview of the instrument and deals with the specific

characteristics.

Data sheets and brochures

Documentation overview

R&S®OSP

13Getting Started 1178.7117.02 ─ 10

See www.rohde-schwarz.com/brochure-datasheet/osp-n

If there is a data mismatch between the data sheet and other documentation, the

information given in the data sheet is valid.

3.4 Service manual

Describes handling failed modules, module replacement, troubleshooting and

special remote control commands for service purposes. The document also con-

tains spare part lists and mechanical drawings. The service manual ("Classified

Service Document") is available for Rohde & Schwarz personnel, only.

3.5 Printed safety instructions

Provides safety information in many languages. The printed document is deliv-

ered with the product.

3.6 Instrument security procedures

Deals with security issues when working with the R&S OSP in secure areas. It is

available for download on the internet.

3.7 Release notes, open source acknowledgment

The release notes list new features, improvements and known issues of the cur-

rent firmware version, and describe the firmware installation. The open-source

acknowledgment document (OSA) provides verbatim license texts of the used

open-source software.

The documents are available for download at www.rohde-schwarz.com/firmware/

osp-n. The OSA is available for download also from the switch unit during "Web-

GUI" control at "Main" > "Context Menu" > "Downloads..."..

Release notes, open source acknowledgment

Documentation overview

R&S®OSP

14Getting Started 1178.7117.02 ─ 10

3.8 Application notes & cards, white papers, etc.

These documents deal with special applications or background information on

particular topics. See www.rohde-schwarz.com/application/osp and www.rohde-

schwarz.com/application/osp-n.

Also, we recommend reading the application note "Guidance on Selecting and

Handling Coaxial RF Connectors", which is available on the Internet at

www.rohde-schwarz.com/appnote/1MA99.

3.9 Tutorials

Tutorials offer guided examples and demonstrations on operating the R&S OSP.

They are provided on the product page of the internet.

Tutorials

Preparing for use

R&S®OSP

15Getting Started 1178.7117.02 ─ 10

4 Preparing for use

Here, you can find basic information about setting up the product for the first time.

●Lifting and carrying..........................................................................................15

●Unpacking and checking................................................................................. 16

●Choosing the operating site............................................................................ 16

●Setting up the product..................................................................................... 17

●Accessory list.................................................................................................. 19

●Considerations for test setups.........................................................................19

●Connecting to power....................................................................................... 21

●Connecting to LAN.......................................................................................... 21

●Connecting monitor, mouse and keyboard......................................................22

●Connecting RF cables.....................................................................................22

●Connecting control cables...............................................................................23

●Switching on or off...........................................................................................23

●Checking the installed modules...................................................................... 25

●Configuring the initial instrument settings....................................................... 26

4.1 Lifting and carrying

See "Lifting and carrying the product" on page 6.

The R&S OSP has protruding handles at the left and right of its front panel. Each

handle is designed to carry the weight of the switch unit. Also, the handles pro-

vide some mechanical protection for the front panel.

Figure 4-1: Handles (1) for lifting and carrying the R&S

OSP. Underneath: foldable feet (2)

Lifting and carrying

Preparing for use

R&S®OSP

16Getting Started 1178.7117.02 ─ 10

4.2 Unpacking and checking

1. Unpack the product carefully.

2. Retain the original packing material. Use it when transporting or shipping the

product later.

3. Using the delivery notes, check the equipment for completeness.

4. Check the equipment for damage.

If the delivery is incomplete or equipment is damaged, contact

Rohde & Schwarz.

4.3 Choosing the operating site

Specific operating conditions ensure proper operation and avoid damage to the

product and connected devices. For information on environmental conditions

such as ambient temperature and humidity, see the data sheet.

See also "Choosing the operating site" on page 6.

Electromagnetic compatibility classes

The electromagnetic compatibility (EMC) class indicates where you can operate

the product. The EMC class of the product is given in the data sheet.

●Class B equipment is suitable for use in:

– Residential environments

– Environments that are directly connected to a low-voltage supply network

that supplies residential buildings

●Class A equipment is intended for use in industrial environments. It can cause

radio disturbances in residential environments due to possible conducted and

radiated disturbances. It is therefore not suitable for class B environments.

If class A equipment causes radio disturbances, take appropriate measures to

eliminate them.

Choosing the operating site

Preparing for use

R&S®OSP

17Getting Started 1178.7117.02 ─ 10

4.4 Setting up the product

See also "Intended use" on page 5 and "Setting up the product" on page 7.

4.4.1 Placing the product on a bench top

To place the product on a bench top

1. Place the product on a stable, flat and level surface. Ensure that the surface

can support the weight of the product. For information on the weight, see the

data sheet.

2. CAUTION! Foldable feet can collapse. See "Setting up the product"

on page 7.

Always fold the feet completely in or out. With folded-out feet, do not place

anything on top or underneath the product.

3. WARNING! A stack of products can fall over and cause injury. Never stack

more than three products on top of each other. Instead, mount them in a rack.

Stack as follows:

● If the products have foldable feet, fold them in completely.

● It is best if all products have the same dimensions (width and length). If the

products have different dimensions, stack according to size and place the

smallest product on top.

● Do not exceed the permissible total load placed on the product at the bot-

tom of the stack:

– 50 kg when stacking products of identical dimensions (left figure).

– 25 kg when stacking smaller products on top (middle figure).

Setting up the product

Preparing for use

R&S®OSP

18Getting Started 1178.7117.02 ─ 10

Left = Stacked correctly, same dimensions

Middle = Stacked correctly, different dimensions

Right = Stacked incorrectly, too many products

4. NOTICE! Overheating can damage the product.

Prevent overheating as follows:

● Keep a minimum distance of 10 cm between the fan openings of the prod-

uct and any object in the vicinity to provide sufficient airflow and ventila-

tion.

● Do not place the product next to heat-generating equipment such as radia-

tors or other products.

4.4.2 Mounting the product in a rack

Note that the satellite unit R&S OSP-B200S2 is not designed for rack-mounting.

To prepare the rack

1. Observe the requirements and instructions in "Setting up the product"

on page 7.

2. NOTICE! Insufficient airflow can cause overheating and damage the product.

Design and implement an efficient ventilation concept for the rack.

To mount the product in a 19'' rack

1. Use an adapter kit to prepare the product for rack mounting.

a) Order the rack adapter kit designed for the product:

● For 2 HU (R&S OSP220 and R&S OSP230), use R&S ZZA-KNA21

(order no. 1177.8026.00)

● For 3 HU (R&S OSP320), use R&S ZZA-KNA31 (order no.

1177.8032.00)

b) Mount the adapter kit. Follow the assembly instructions provided with the

adapter kit.

2. Grab the R&S OSP by its handles (Figure 4-1).

3. Insert it onto the shelf until the rack brackets fit closely to the rack.

4. Tighten all screws on the rack brackets, typically with a torque of 4.6 Nm, to

secure the product in the rack.

Setting up the product

Preparing for use

R&S®OSP

19Getting Started 1178.7117.02 ─ 10

To unmount the product from a rack

1. Loosen the screws at the rack brackets.

2. Remove the product from the rack.

3. If placing the product on a bench top again, unmount the adapter kit from the

product. Follow the instructions provided with the adapter kit.

4.5 Accessory list

The R&S OSP base unit comes with the following accessories:

●Printed "Getting Started" manual, English (order no. 1178.7117.02)

●Ethernet (LAN) cable, 2 m, RJ45 (1:1), category 6 (order no. 0041.9748.00)

●Power supply cable, delivered country-specific to fit your local wall outlet for-

mat, see Table 4-1

Table 4-1: Power cords

Power supply cables according to country-specific standards Order no.

European standard

Angular adapter for European standard

0025.2365.00

0086.4400.44

British standard 0006.7013.00

Swiss standard 0006.7020.00

US American standard 0006.7036.00

Australian standard 0006.7107.00

Chinese standard 0041.4752.00

Japanese standard 0041.6232.00

Brazilian standard 3587.8102.00

4.6 Considerations for test setups

Preventing electrostatic discharge (ESD)

Electrostatic discharge is most likely to occur when you connect or disconnect a

DUT.

Considerations for test setups

Preparing for use

R&S®OSP

20Getting Started 1178.7117.02 ─ 10

►NOTICE! Electrostatic discharge can damage the electronic components of

the product and the device under test (DUT).

Ground yourself to prevent electrostatic discharge damage:

a) Use a wrist strap and cord to connect yourself to ground.

b) Use a conductive floor mat and heel strap combination.

A risk of damage due to ESD is typically limited to switch units that are equipped

with modules that have one or more of the following features:

●Digital input or output ports (I/O ports)

●Solid-state relays (SSR)

●Integrated amplifiers in special modules that are delivered as part of a test

system

Preventing electromagnetic interference (EMI)

Electromagnetic interference (EMI) can affect the measurement results.

To suppress electromagnetic radiation during operation:

●Use high-quality shielded cables, for example, double-shielded RF, LAN and

HDMI cables.

Note: USB cables are of varying and often poor quality. Therefore, consider

the quality of each individual USB cable.

●Always terminate open cable ends.

●Note the EMC classification in the data sheet.

●Ensure that connected external devices comply with EMC regulations.

Preventing overload on internal terminations

Overloading an electromechanical RF relay with internal port termination can

damage or destroy the relay.

The maximum load that the internal termination of one port can handle is approxi-

mately 1 W. However, if the relay has several terminated ports, their cumulative

maximum load is less than the sum. For example, an SP6T relay with 6 internally

terminated ports cannot handle 6 W, but typically 3 W, only.

To avoid the risk of damage due to overloading internal terminations, limit the load

to the "Max. termination power per relay" that is specified in the data sheet.

Considerations for test setups

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Rohde&Schwarz OSP Getting Started

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