Kramer Electronics VS-55A
Contents
1. 5 2 Getting to Know Your VS 55A Switcher The Kramer VS 55A is a high performance 5x1 switcher for stereo audio signals Using RCA connectors one of up to five sources can be routed to an output The VS 55A can be used as an independent audio switcher but is also designed to easily link with other VS 55 series Kramer switchers such as the VS 55V for composite video or the VS 55YC for s Video to form audio follow video systems The VS 55A also provides an EXT connector which allows several units to be combined to form larger switching systems For example two units will form a 10x1 three will form a 15x1 etc A 12VDC power supply is included for typical operation but the optional model VA 50P can power up to six Kramer devices requiring 12VDC All Kramer VM 50 and VS 55 series products can be rack mounted using the model RK 50R rack kit which holds two units in one or two vertical rack spaces Panel features of the VS 55A are described in Figure 2 and Table 2 INPUTS Figure 2 VS 55A Front and Rear Panel Features Table 2 VS 55A Front and Rear Panel Features POWER Switch Supplies power to the machine LINK Socket A 9 pin D sub female socket for parallel operation of several machines or for contact closure remote control Kramer Electronics Ltd 5 3 Getting to Know Your VS 55V Switcher The Kramer VS 55V is a high performance 5x1 vertical interval switcher designed for composite video signals One of2. gt 78 dB Y 1 4 Vpp 75 ohms Y 12 V Power Supply 16 5 x 12 x 4 5 cm 6 5 x 4 7 x 1 8 12 VDC 115 mA 0 64 kg 1 4 lbs Approx Kramer Electronics Ltd 3 3 HOW DOI GET STARTED The fastest way to get started is to take your time and do everything right the first time Taking 15 minutes to read the manual may save you a few hours later You don t even have to read the whole manual If a section doesn t apply to you you don t have to spend your time reading it 4 UNPACKING AND CONTENTS The items contained in your Kramer accessory package are listed below Please save the original box and packaging materials for possible future transportation and shipment gt gt gt Switcher User Manual Kramer Concise Product Catalog 12 V DC Power Supply 4 Rubber Feet 4 1 Optional Accessories The following accessories which are available from Kramer can enhance implementation of your switcher For information regarding cables and additional accessories contact your Kramer dealer gt gt Rack Adapter RK 50R Used to install smaller machines in a standard 1 or 2 U rack One or more machines may be installed on each adapter BNC Y Connector Used for looping purposes and splits the incoming signal to enable connection of an additional machine Termination Plug Used to terminate the line to 75ohm for proper matching A video or s Video distribution amplifier such as the Krame
3. PHASE THD S N Ratio Max Output Accessories Dimensions W D H Power Supply Weight VS 55V 5x1 VS 55 Dual 5x1 5 stereo audio 1Vpp 50 k on RCAs 5 Composite single Component 1Vpp 75ohm on BNCs 5 dual signals on RCA connectors 1 dual signal on RCA 1 stereo audio 1 Composite single connectors 1Vpp 100 ohms on _ Component LINK connector REAS O oe DB9 EXT LINK connector connector RCA DB9 EXT LINK connector connector RCA DB9 EXT connector RCA Electromechanical Electromechanical Electromechanical 270 MHz 100 kHz 150 MHz 5 front panel touch switches remote contact closure 5 front panel touch 5 front panel touch switches remote contact closure switches remote contact closure NA 0 35 Deg Up to 60 V gt 1 6 Vpp 75 ohms 12 V Power Supply 12 V Power Supply 16 5 x 12 x 4 5 cm 6 5 x 4 7 x 1 8 12 VDC 100 mA 0 62kg 1 4 lbs Approx 16 5 x 12 x 4 5 cm 6 5 x 4 7 x 1 8 12 VDC 100 mA 0 62kg 1 4 lbs Approx 16 5 x 12 x 4 5 cm 6 5 x 4 7 x 1 8 12 VDC 100 mA 0 66 kg 1 46 lbs Approx 5 s Video Y C 1Vpp 75ohm Y 0 3 Vpp 75ohm C on 4P connectors 1 s Video Y C 1Vpp 75ohm Y 0 3 Vpp 75ohm C on a 4P connector LINK connector DB9 EXT connector RCA Electromechanical 120 MHz Y i tH n 5 front panel touch switches remote contact closure 0 03 0 07 Deg NA
4. CONNECTOR Hae oaoovo rraua ta RwWNHND N ww YwRNd FP Oownrnan NONDWU Kramer Electronics Ltd 1 INTRODUCTION Congratulations on your purchase of this Kramer Switcher Since 1981 Kramer has been dedicated to the development and manufacture of high quality video audio equipment The Kramer line has become an integral part of many of the best production and presentation facilities around the world In recent years Kramer has redesigned and upgraded most of the line making the best even better Kramer s line of professional video audio electronics is one of the most versatile and complete available and is a true leader in terms of quality workmanship price performance ratio and innovation In addition to the Kramer line of high quality switchers such as the one you have just purchased Kramer also offers a full line of high quality distribution amplifiers processors interfaces controllers and computer related products This manual includes configuration operation and option information for the following Kramer switchers They are grouped here as they are similar in operation and features gt VS 55 5x1 Dual Wideband Switcher gt VS 55A 5x1 Stereo Audio Switcher gt VS 55V 5x1 Video Switcher gt VS 55YC 5x1 s Video Switcher 1 1 A Word on Video Switchers Switchers route one or more sources signals to one or more users They vary in the number of inputs programming cap
5. light industry environment CFR 47 FCC Rules and Regulations Part 15 Radio frequency devices Subpart B Unintentional radiators CAUTION B Servicing the machines can only be done by an authorized Kramer technician Any user who makes changes or modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the equipment B Use the supplied DC power supply to feed power to the machine gt Please use recommended interconnection cables to connect the machine to other components Kramer Electronics Ltd 14 For the latest information on our products and a list of Kramer distributors visit our Web site www kramerelectronics com where updates to this user manual may be found We welcome your questions comments and feedback Safety Warning Disconnect the unit from the power supply before opening servicing Caution Kramer Electronics Ltd Web site www kramerelectronics com E mail info kramerel com P N 2900 002040 REV 4
6. of an identical signal format as at the input of your display Confirm that any other device in the signal path have the proper input and or output selected Use the Video Tester to test the video path leading to from your machine see section 4 1 Video Tester Verify that the lines are well matched through 75ohm impedance otherwise it results in a video level that is too high or too dim Confirm that the connecting cables are of high quality and properly inserted Check level controls located on your source input device or output display Hum bars ground loop are caused by a difference in the ground potential of any two or more devices connected to your signal path WARNING Do not disconnect the ground from any piece of video equipment in your signal path Check the following to remove hum bars Confirm that all interconnected equipment is connected to the same phase of power if possible Remove equipment connected to that phase that may introduce noise such as motors generators etc Disconnect all interconnect cables and reconnect them one at a time until ground loop reappears Disconnect the affected cable and replace or insert an isolation transformer in the signal path Confirm that your sources and output device are powered on and connected properly Audio signals connected to the input of your machine should be properly wired to the output of your source Audio signals connected to the output of your machine shoul
7. of the VS S55YC to the input of your s Video acceptor Connect the output of of the VS 55A to the input of your Audio acceptor Connect the power supply to the VS 55YC and VS 55A Operate the VS 55 machines the sources and the acceptor For example pressing switch 2 of the Input Selector switch bank of the VS 55YC will automatically activate switch 2 of the VS 55A VVVVV V Y VS 55YC Audio Source 5 Amplifier Figure 6 Parallel Signal Switching Kramer Electronics Ltd 11 8 4 Remote Controlling the Switchers All the switchers of the VS 55 family may be contact closure remote controlled via the LINK connector The distance between the switcher and the remote contact closure assembly should preferably no be more than 10 meters Use table 5 below for identification of the 9 pin D sub pin numbers and their use gt Connect a 9 pin D sub male plug and cable screened or flat into the LINK connector of the VS 55 family switcher gt Identify the wires corresponding to the relevant pins in table 5 gt Pin 3 which is 8V VCC should be the common line of the contact closure assembly Momentarily touching one of the wires connected to pins 5 6 7 8 9 of the 9 pin D sub connector will activate the corresponding switch For example forming a momentary connection between pin 7 wire to the VCC wire pin 3 will force the switcher to activate switch 4 Connecting pin 9 wire momentarily to pin 3 wire will activat
8. For the name of the nearest Kramer authorized service center consult your authorized dealer LIMITATION OF IMPLIED WARRANTIES All implied warranties including warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this warranty EXCLUSION OF DAMAGES The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option Kramer shall not be liable for 1 Damage to other property caused by defects in this product damages based upon inconvenience loss of use of the product loss of time commercial loss or 2 Any other damages whether incidental consequential or otherwise Some countries may not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limitations and exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from place to place NOTE All products returned to Kramer for service must have prior approval This may be obtained from your dealer This equipment has been tested to determine compliance with the requirements of EN 50081 Electromagnetic compatibility EMC generic emission standard Part 1 Residential commercial and light industry EN 50082 Electromagnetic compatibility EMC generic immunity standard Part 1 Residential commercial and
9. Kramer Electronics Ltd USER MANUAL ELECTRONIC SWITCHERS Models VS 55 VS 55A VS 55V VS 55YC IMPORTANT Before proceeding please read paragraph entitled Unpacking and Contents Kramer Electronics LTD Contents 1 INTRODUCTION 1 1 A Word on Video Switchers 1 2 Factors Affecting Quality of Results 2 SPECIFICATIONS 3 HOW DO I GET STARTED 4 UNPACKING AND CONTENTS 4 1 Optional Accessories 5 ELECTRONIC SWITCHERS 5 1 Getting to Know Your VS 55 Switcher 5 2 Getting to Know Your VS 55A Switcher 5 3 Getting to Know Your VS 55V Switcher 5 4 Getting to Know Your VS 55YC Switcher 6 INSTALLATION 6 1 Rack Mounting 7 CONNECTING TO VIDEO OR AUDIO DEVICES 8 USING THE SWITCHERS 8 1 Connecting and Controlling the Switchers 8 2 Extending a Switcher 8 3 Parallel Signal Switching 8 4 Remote Controlling the Switchers 9 TAKING CARE OF YOUR MACHINE 10 TROUBLESHOOTING 10 1 Video Signal 10 2 Audio Signal Figures FIGURE 1 VS 55 FRONT AND REAR PANEL FEATURES FIGURE 2 VS 55A FRONT AND REAR PANEL FEATURES FIGURE 3 VS 55V FRONT AND REAR PANEL FEATURES FIGURE 4 VS 55YC FRONT AND REAR PANEL FEATURES FIGURE 5 EXTENDING A SWITCHER ADDING INPUTS FIGURE 6 PARALLEL SIGNAL SWITCHING Tables TABLE 1 VS 55 FRONT AND REAR PANEL FEATURES TABLE 2 VS 55A FRONT AND REAR PANEL FEATURES TABLE 3 VS 55V FRONT AND REAR PANEL FEATURES TABLE 4 VS 55YC FRONT AND REAR PANEL FEATURES TABLE 5 PINCONFIGURATION OF THE LINK
10. ability number of outputs operating format audio composite video component etc and switching method i e whether they switch during the vertical interval or not whether they are electronic RS 232 or mechanically controlled A switcher usually switches between several sources inputs and one or more acceptors outputs A switcher that allows several inputs to be connected to several outputs simultaneously is called a matrix switcher Switchers may be of the electronic or mechanical type Most matrices are of the active electronic type with many crosspoints Vertical Interval Switching frequently used in video ensures that the transition from one video source to another is smooth and without interference The switchers described in this manual are electronic switchers have full specifications various control options and expandability and can be rack mounted using special adapters Most of them offer a simple and economic solution for every video audio or wideband signal application 1 2 Factors Affecting Quality of Results There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor gt Connection cables Low quality cables are susceptible to interference they degrade signal quality due to poor matching and cause elevated noise levels They should therefore be of the best quality gt Sockets and connectors of the sources and acceptors So often ignored they should be of highe
11. anel Features Table 4 VS 55YC Front and Rear Panel Features No Feature Function I POWER Switch Supplies power to the machine 2 INPUT Selector Switches Illuminated touch button switches for selecting the desired input 3 INPUTS Sockets 5 4P connectors that serve as the inputs to the machine 4 OUT Socket 1 4P connector that serves as the output of the machine 5 EXT Socket A single RCA socket that is used for switcher extension 6 12VDC Socket For connecting a DC power supply to the machine 7 LINK Socket A 9 pin D sub female socket for parallel operation of several machines or for contact closure remote control Kramer Electronics Ltd 8 6 INSTALLATION 6 1 Rack Mounting The Kramer VS 55 series switchers may be rack mounted in a standard 19 1 or 2U EIA rack assembly using a special Adapter RK 50R 1U or a 2U model and a mounting bracket see section 4 1 They can also be table mounted using their rubber feet or the provided mounting brackets These devices do not require any specific spacing above or below the unit for ventilation To rack mount any of the machines follow the installation instructions enclosed with the adaptor 7 CONNECTING TO VIDEO OR AUDIO DEVICES Video sources and output devices such as monitors or recorders may be connected to the switchers through the BNC connectors VS 55V through the RCA connectors VS 55 VS 55A or through the 4P connectors VS 55YC located on the back o
12. as been torn reattached removed or otherwise interfered with 3 Damage deterioration or malfunction resulting from i Accident misuse abuse neglect fire water lightning or other acts of nature ii Product modification or failure to follow instructions supplied with the product iii Repair or attempted repair by anyone not authorized by Kramer iv Any shipment of the product claims must be presented to the carrier v Removalor installation of the product vi Any other cause which does not relate to a product defect vii Cartons equipment enclosures cables or accessories used in conjunction with the product WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR We will pay labor and material expenses for covered items We will not pay for the following 1 Removal or installations charges 2 Costs of initial technical adjustments set up including adjustment of user controls or programming These costs are the responsibility of the Kramer dealer from whom the product was purchased 3 Shipping charges HOW YOU CAN GET WARRANTY SERVICE 1 To obtain service on you product you must take or ship it prepaid to any authorized Kramer service center 2 Whenever warranty service is required the original dated invoice or a copy must be presented as proof of warranty coverage and should be included in any shipment of the product Please also include in any mailing a contact name company address and a description of the problem s 3
13. cable between the RCA EXT connectors of the machines An audio cable with two RCA connectors at the ends will do if the distance between the switchers is no more than 5 meters gt Connect a T connector to the output of switcher 1 gt Connect a high quality coax BNC to BNC cable between one of the edges of the T connector and the output socket of switcher 2 gt Connect a high quality coax BNC to BNC cable between the other edge of the T connector and the input of your acceptor gt Connect 5 video sources in this case using the VS 55V to the input sockets of switcher 1 gt Connect another 5 video sources to the input sockets of switcher 2 gt Connect the power supply to the VS 55V machines gt Operate the VS 55V machines the video sources and the acceptor gt The switches on the front of switcher 1 correspond to inputs 1 5 and on switcher 2 to inputs 6 10 When you press a button on switcher 1 for example all the other buttons including the ones on switcher 2 will be off gt To add more switchers forming a 15x1 20x1 etc configuration interconnect all EXT sockets from all switchers using appropriate connectors and T connect all outputs in a similar way You should use a T connector for all video outputs but the last From the first machine s T connector connect a BNC to BNC cable to the second machine s T connector from the second machine to the third and so on The
14. d be properly wired to the input of your machine or recorder Confirm that any other amplifiers in the signal path have the proper input and or output selected Pay special attention to input amplifiers that may be built into your acceptor Confirm that the connecting cables are of high quality and properly built Take special care in noting the wiring configuration of balanced to unbalanced cables Check level controls located on your source input device or output display or recorder Kramer Electronics Ltd 13 K LIMITED WARRANTY Kramer Electronics hereafter Kramer warrants this product free from defects in material and workmanship under the following terms HOW LONGIS THE WARRANTY Labor and parts are warranted for seven years from the date of the first customer purchase WHO IS PROTECTED Only the first purchase customer may enforce this warranty WHAT IS COVERED AND WHAT IS NOT COVERED Except as below this warranty covers all defects in material or workmanship in this product The following are not covered by the warranty 1 Any product which is not distributed by Kramer or which is not purchased from an authorized Kramer dealer If you are uncertain as to whether a dealer is authorized please contact Kramer at one of the agents listed in the Web site www kramerelectronics com 2 Any product on which the serial number has been defaced modified or removed or on which the WARRANTY VOID IF TAMPERED sticker h
15. e switch 2 gt Be careful not to short pin 3 VCC and pin 2 ground as it may blow the fuse of the machine gt Connecting several switchers and their LINK connectors in parallel will enable the user to activate all interconnected switchers with one momentary connection Table 5 Pin Configuration of the LINK Connector 9 TAKING CARE OF YOUR MACHINE Do not locate your machine in an environment where it is susceptible to dust or moisture Both of these may damage the electronics and cause erratic operation or failure Do not locate your machine where temperature and humidity may be excessive Do not clean your machine with abrasives or strong cleaners Doing so may remove or damage the finish or may allow moisture to build up Take care not to allow dust or particles to build up inside unused or open connectors Kramer Electronics Ltd 2 10 TROUBLESHOOTING 10 1 Video Signal Problem No video at the output device regardless of input selected Video level is too high or too dim Noise bars roll up or down in the output image or Low Frequency Hum in the output signal 10 2Audio Signal No audio at the output device regardless of input selected Audio level is too low Confirm that your source and output devices are powered on and connected properly The input of your machine should be of an identical signal format at the output of your source Signals at the output of your machine should be
16. f the unit The active inputs should be terminated by the connecting source The output signal format should match that of the input signal format e g if Composite video is input then Composite video is output The signals supported by the various models are video s video RGB YUV and audio signals 8 USING THE SWITCHERS 8 1 Connecting and Controlling the Switchers 1 Connect all inputs of the VS 55 family switcher to the sources to be switched taking care to use the right high quality cables If linking is needed interconnect the linked units with a DB9 male to male flat cable Use video cables for video audio cables for audio etc Use of the wrong cable will impair output quality 2 Connect the output of the VS 55 type switcher to the input s of the acceptor again using high quality cables turn on all units sources acceptors and the VS 55 units and you are ready to go 3 If there no video signal is connected to input 1 then the VS 55V and VS 55YC units operate as electronic switchers without Vertical Interval switching 4 If you would like to extend the number of switched inputs say forming a 10x1switcher it can only be done by using two machines of the same type e g two VS 55Vs or two VS 55YCs etc In order to do so you should connect both EXT connectors to each other using a screened cable an audio cable will do the job well Then connect outputs of both machines to each other using a T connector The c
17. he output of the machine A single RCA socket that is used for switcher extension For connecting a DC power supply to the machine A 9 pin D sub female socket for parallel operation of several machines or for contact closure remote control Kramer Electronics Ltd 5 4 G etting to Know Your VS 55YC Switcher The Kramer VS 55YC is a high performance 5x1 vertical interval switcher designed for s Video Y C signals One of up to five sources can be routed to one monitor projector or other receiving device Since it switches during the vertical interval transitions are glitch free when sources share common reference sync The LINK connector is designed to allow the use of a VS 55A to form audio follow video systems The VS 55YC also provides an EXT connector which allows several units to be combined to form larger switching systems For example two units will form a 10x1 three will form a 15x1 etc A 12VDC power supply is included for typical operation but the optional model VA 50P can power up to six Kramer devices requiring 12VDC All Kramer VM 50 and VS 55 series products can be rack mounted using the model RK 50R kit that holds two units in one or two vertical rack spaces Panel features of the VS 55YC are described in Figure 4 and Table 4 INPUT SELECTOR _ 1 2 3 4 5 Vertical Interval s Video Switcher vs 55YC INPUTS 3 Figure 4 VS 55YC Front and Rear P
18. lays the VS 55 can also operate in the opposite direction allowing one source to be routed to any one of five destinations The VS 55 also provides an EXT connector which allows several units to be combined to form larger switching systems For example two units will form a 10x1 three will form a 15x1 etc A 12VDC power supply is included for typical operation but the optional model VA 50P can power up to six Kramer devices requiring 12VDC All Kramer VM 50 and VS 55 series products can be rack mounted using the model RK 50R kit that holds two units in one or two vertical rack spaces Panel features of the VS 55 are described in Figure 1 and Table 1 2 INPUT SELECTOR CITT KRAMER 5x1 Dual Wideband Switcher VS 55 LINK 00000 O B 12VDC OUT IN EXT 50mA Figure 1 VS 55 Front and Rear Panel Features Table 1 VS 55 Front and Rear Panel Features Supplies power to the machine Illuminated touch button switches for selecting the desired input 5 Dual RCA connectors that can serve as inputs or outputs 1 Dual RCA connector that can serve as output or input A single RCA socket that is used for switcher extension For connecting a DC power supply to the machine A 9 pin D sub female socket for parallel operation of several machines or for contact closure remote control Kramer Electronics Ltd 5
19. ombined output should then be connected to your acceptor The concept of operation is as following the machines sense each other s status via the EXT connector and when a certain machine senses that the other is active it shuts off it s own output circuitry so in every given instance only one machine is actively connected to the acceptor 5 The cables leading from the combined output to the acceptor s input and between the outputs of the VS 55 linked machines should be as short as possible 6 Connect the VS 55 machines to an appropriate 12 V DC source observing correct polarity center pin is positive 7 Turn on the sources The VS 55 switcher s and the acceptors 8 If you have connected two or more machines via the EXT connector when turning on the system sometimes a random combination of switches may light Press any of the switches on any of the interconnected VS 55 units and the system will reset 9 The VS 55 family allows remote controlling the switcher s using the LINK connector Connect a DB9 male plug with 9 wires leading from it to the remote location A momentary touch of one of the relevant pins see table 1 to the common VCC pin pin no 8 forces the switcher to activate the corresponding connection Kramer Electronics Ltd 9 8 2 Extending a Switcher Figure 5 illustrates typical switching extension setup using two VS 55V switchers to create a 10x1 switcher gt First connect a dual or shielded
20. r VM 3V VM 50V VM 10ARII VM 20ARII video VM 3S VM 50YC VM 5YC VM 10YC s Video for distributing the output signals to several acceptors simultaneously An Audio Distribution Amplifier such as Kramer VM 50A VM 80A etc for distributing the output signals to several acceptors simultaneously A line amplifier such as Kramer VM 9S 104L video VM 9YC 103YC s Video for transmitting signals over long distances minimizing cable losses VIDEO TESTER A new unique patented indispensable tool for the video professional the Video Tester is used to test a video path leading to from an amplifier By pressing only one touch switch it can trace missing signals distinguish between good and jittery VCR sourced signals and identify the presence of good signals Whenever a video signal is missing because of bad connections cable breaks or faulty sources the Video Tester is all you need Kramer Electronics Ltd 4 5 ELECTRONIC SWITCHERS This section describes the controls and connections of your switcher Understanding all the controls and connections helps you realize the full power of your switcher 5 1 Getting to Know Your VS 55 Switcher The Kramer VS 55 is a high quality dual wideband switcher for use with any set of dual signals such as stereo audio s Video Y C balanced audio etc It allows one of up to five dual sources to be routed to one dual output Since the signal path is passive using high quality re
21. second free T output of machine 1 should be connected to your video acceptor gt All interconnected machines should be close to each other otherwise signal quality might be affected KRAMER INPUT SELECTOR POWER a ae y KA KRAMER Vertical Interval Video Switcher vs 55V Vertical Interval Video Switcher vs 55V INPUTS OUT oles Se ot oezo on OOQOQOQOOQO oP EXT Soma a A 1 Link EXT connectors 2 Link OUTputs with a Sources 1 5 Acceptor Sources 6 10 T connector Figure 5 Extending a Switcher Adding Inputs Kramer Electronics Ltd 10 8 3 Parallel Signal Switching Figure 6 illustrates a typical setup for switching s Video and Audio signals in parallel thus forming an Audio follow video switcher For parallel switching as many switchers may be added as needed For example three VS 55V switchers may be operated in parallel forming a YUV or and RGB 5x1 switching system gt Connect a 9 pin D sub to 9 pin D sub flat cable between the LINK connectors of the switchers Connect 5 s Video sources to the input sockets of the VS 55YC switcher using high quality cables with 4P connectors at the ends Connect 5 stereo audio sources to the input sockets of the VS 55A switcher using high quality cables with RCA connectors at the ends Connect the output of
22. st quality since Zero Ohm connection resistance is the objective Sockets and connectors also must match the required impedance 75ohm in video Cheap low quality connectors tend to rust thus causing breaks in the signal path gt Amplifying circuitry Must have quality performance when high linearity low distortion and low noise operation are the desired end result gt Distance between sources and acceptors Plays a major role in the result For long distances over 15 meters between sources and acceptors special measures should be taken in order to avoid cable losses These include using higher quality cables or adding line amplifiers gt Interference from neighboring electrical appliances These can have an adverse effect on signal quality Balanced audio lines are less prone to interference but unbalanced audio should be installed far from any mains power cables electric motors transmitters etc even when the cables are shielded No operator serviceable parts inside unit Use only the Kramer Electronics input power wall adapter that is provided with this unit Disconnect power and unplug unit from wall before installing or removing device or servicing unit 1 For example model number AD2512C part number 2535 000251 Kramer Electronics Ltd 2 2 SPECIFICATIONS Configuration Inputs Outputs Switching system Vertical Interval Bandwidth Control DIFF GAIN DIFF
23. up to five sources can be routed to one monitor projector or other receiving device Since it switches during the vertical interval transitions are glitch free when sources share common reference sync The LINK connector is designed to allow the use of a VS 55A to form audio follow video systems The VS 55V also provides an EXT connector which allows several units to be combined to form larger switching systems For example two units will form a 10x1 three will form a 15x1 etc A 12VDC power supply is included for typical operation but the optional model VA 50P can power up to six Kramer devices requiring 12VDC All Kramer VM 50 and VS 55 series products can be rack mounted using the model RK 50R kit that holds two units in one or two vertical rack spaces Panel features of the VS 55V are described in Figure 3 and Table 3 POWER HYCO m INPUT SELECTOR 1 2 3 4 5 Vertical Interval Video Switcher vs 55V LINK fo ooo o INPUTS e200 f 3 12VDC EXT A Figure 3 VS 55V Front and Rear Panel Features Table 3 VS 55V Front and Rear Panel Features Feature POWER Switch INPUT Selector Switches INPUTS Sockets OUT Socket EXT Socket 12VDC Socket LINK Socket Function Supplies power to the machine Illuminated touch button switches for selecting the desired input 5 BNC connectors that serve as the inputs to the machine 1 BNC connector that serves as t
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