USER MANUAL - Kramer Electronics
Contents
1. VM 80V 1 8 Video Distribution Amplifier 2 Composite single component video 1Vpp 75ohm on BNCs with termination switches 2x4 Composite single component video 1Vpp 750ohm on BNCs DC or AC internal jumper selection 74 dB NA gt 330 MHz 3dB 2 Vpp 0 12 0 5Deg NA lt 0 1 22 cm x 18cm x 4 5cm 8 7 x 7 x 1 8 1 3 Kg 2 9lbs Approx 100 240VAC 50 60 Hz 10VA VM 10AN 1 10 AV Distribution Amplifier 1 video looping 1Vpp 75ohm on a BNC with a termination switch 1 stereo audio 1Vpp 50 K ohm on RCAs 10 video 1 Vpp 75ohm on BNCs 10 stereo audio 1Vpp 100 ohm on RCAs DC AC internally selectable gt 89dB 1V audio gt 74dB video 20 kHz 1dB gt 77 MHz 3dB 2 5 Vpp 0 33 0 26Deg lt 0 025 lt 0 05 24 5 cm x 16 cm x 5cm 9 6 x 6 3 x 2 1 8 Kg 4 lbs Approx 230VAC 50Hz 115V USA 10 5VA KRAMER ELECTRONICS LTD 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 the 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 VM amplifier package are listed below Please save the original box and packaging materials for possible future shipment of the amplifier gt The ampli2. KRAMER ELECTRONICS Ltd USER MANUAL Video Audio Distribution Amplifiers Models VM 80V VM 10AN IMPORTANT Before proceeding please read paragraph entitled Unpacking and Contents Section 11 1 11 2 11 3 Figure Table Table Of Contents Name INTRODUCTION A Word on Distribution Amplifiers Factors Affecting Quality of Results SPECIFICATIONS HOW DOI GET STARTED UNPACKING AND CONTENTS Optional Accessories VM SERIES AMPLIFIERS Getting to know your VM 80V Getting to know your VM 10AN Amplifier INSTALLATION CONNECTING TO VIDEO DEVICES CONNECTING TO AUDIO DEVICES USING THE VM VIDEO AUDIO AMPLIFIERS Turning on the Amplifier Looping Coupling Coupling Selection Operating the VM 80V Operating the VM 10AN Taking Care of Your Amplifier TROUBLESHOOTING Power and Indicators Audio Signal Video Signal List Of Illustrations Page VM 80V Front Rear Panel Features VM 10AN Front Rear Panel Features List Of Tables VM 80V Front Rear Panel Features VM I1OAN Front Rear Panel Features Page VO O O O DO O o o DA WANI ADA HH HW NV Se O KRAMER ELECTRONICS LTD 1 1 1 1 2 1 3 INTRODUCTION Congratulations on your purchase of this Kramer Electronics amplifier 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
3. 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 amplifiers such as the one you have just purchased Kramer also offers a full line of high quality switchers processors interfaces controllers and computer related products This manual includes configuration operation and option information for the VM 80V and VM 10AN distribution amplifiers A Word On Distribution Amplifiers Distribution amplifiers are used to distribute one source to several acceptors for simultaneous recording or monitoring of one source with no discernible signal degradation They vary in the number of inputs looping capability programming capability number of outputs operating format bandwidth and input output coupling A good quality distribution amplifier amplifies the incoming signal pre compensates the signal for potential losses resulting from the use of long cables noisy source etc and generates several identical buffered and amplified outputs Factors Affecting Quality of Results There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor Connection cables Low quality cables are susceptibl
4. be connected to its inputs for switching The machine provides truly effortless switching between eight video and unbalanced audio inputs and one output Switching is done during vertical interval either of source 1 or of the video available on the external sync socket The switcher may be controlled by touch buttons or by contact closure via a remote socket on the back of the machine Video signal bandwidth is 225 MHz typical allowing the machine to be used in the most demanding applications TP 1 video Line Transmitter If a DA output is sent over a distance of 100 meters or more it is necessary to convert the signal to twisted pair type The TP 1 sends a color video signal over long distances using telephone wire or any other twisted pair wire thus extending the range of operation of a DA The TP 1 maintains the bandwidth of an industrial color video signal up to several hundred meters and of broadcast quality up to 12 MHz signals up to 100 meters At shorter distances as in a studio bandwidth of 30MHz is easily achieved By using the KRAMER TP 1 together with the TP 2 video Line Receiver coax wiring in a studio for example can be completely eliminated The TP 1 can also be used for simplification of security and CCTV installations and for teleconferencing in offices and hospitals using existing unused intercom or telephone wiring VA 11 video audio Combiner Used to distribute video audio signals The machine can be inserted in fro
5. 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 3 Damage deterioration or malfunction resulting from a Accident misuse abuse neglect fire water lightning or other acts of nature unauthorized b product modification or failure to follow instructions supplied with the product c Repair or attempted repair by anyone not authorized by Kramer d Any shipment of the product claims must be presented to the carrier e Removal or installation of the product f Any other cause which does not relate to a product defect g 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 HO
6. mind that the output signal format must match that of the input signal format CONNECTING TO AUDIO DEVICES Audio sources and output devices such as amplifiers or recorders may be connected to the amplifier through the RCA type connectors VM 10AN located at the back of the machines USING THE VM VIDEO AUDIO AMPLIFIERS Turning On The Amplifier NOTES 1 Amplifier should only be turned on after all connections are completed and all source devices have been turned on Do not attempt to connect or disconnect any video audio or control signals to the amplifier while it is turned on 2 The socket outlet should be near the equipment and should be easily accessible To fully disconnect equipment remove power cord from its socket 1 Press the toggle switch on the far left front panel to the up position In the up position the toggle switch glows and the active input button illuminates as well 2 Operate the sources and acceptors Looping The looping function enables the operator to extend the number of outputs per input The following example describes looping performed by using 3 amplifiers with one input and 5 outputs each A video signal reaches input of amplifier No 1 From looping connector of amplifier No 1 a cable is connected to input socket of amplifier No 2 The loop output of amplifier No 2 is connected to the input socket of amplifier No 3 In this way the input signal is divided into 15 separate output signals The opera
7. the OUTPUT sockets Connect the machine to a mains power source with its power cord Operate source acceptors and the VM 10AN machine TAKING CARE OF YOUR AMPLIFIER Do not locate your amplifier in an environment where it is susceptible to dust or moisture These may damage the electronics and cause erratic operation or failure Do not locate your amplifier where temperature and humidity may be excessive Do not clean your amplifier 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 TROUBLESHOOTING NOTES 1 Please note that if the output signal is disturbed or interrupted by very strong external electromagnetic interference it should return and stabilize when such interference ends If not turn the power switch off and on again to reset the machine 2 If the following recommended actions still do not result in satisfactory operation please consult your KRAMER Dealer KRAMER ELECTRONICS LTD 10 11 1 Power And Indicators Confirm that the rocker switch is in the ON position and that the light is illuminated Confirm that power connections are secured at the amplifier and at the receptacle Make sure the receptacle is active outputting the proper mains voltage gt For model VM 80V perform the following Remove power cord from AC outlet and the machine and then using a fla
8. vertical spaces Front Rear panel features of the VM 10AN are described in Figure 2 and Table 2 KRAMER Video Audio Distributor Ok rO O O O O O O O O O pee 10 O O a OI 230VAC OcOVOOODDNDD INPUT IN 752 LOOP VIDEO AUDIO OUTPUTS wt Figure 2 VM 10AN Front Rear Panel Features Table 2 VM 10AN Front Rear Panel Features Feature Function POWER Illuminated power switch Supplies power to the unit on front panel INPUT Video and audio inputs TERMINATION pushbutton Selects 75ohm or HI z impedance pressed 7S5ohm For looping select Hi z LOOP Video and audio loop connectors VIDEO AUDIO OUTPUTS 10 amplified and buffered video and audio stereo outputs Power connector A 3 prong power cord allows power to be supplied to the unit 6 INSTALLATION The amplifier is provided with four rubber feet packed in a separate bag Fit the feet to the unit place it on the table remote from heat generating sources and make the required connections Use a rack adapter in case a rack installation is required see section 4 1 Rack Adapters in which case do not attach the feet KRAMER ELECTRONICS LTD 8 7 9 1 9 2 9 3 9 4 CONNECTING TO VIDEO DEVICES Video sources and output devices such as amplifiers or recorders may be connected to the amplifier through the BNC connectors located at the back of the machine Please keep in
9. was fine tuned at the factory for transparent operation and unnecessarily adjusting the trimmers will upset this transparency Noise bars roll up or Hum bars ground loop are caused by a difference in the ground potential of any down in the output two or more devices connected to your signal path Passing that voltage difference image through any available interconnection including your video cables compensates or this difference Low frequency hum in the output signal 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 Remove equipment connected to this phase that may be introducing noise such as motors generators etc Disconnect all cables and reconnect them one at a time until ground loop reappears Disconnect the affected cable and replace or insert an isolation device opto isolator or transformer in the signal path KRAMER ELECTRONICS LTD 12 LIMITED WARRANTY Kramer Electronics hereafter Kramer warrants this product to be free from defects in material and workmanship under the following terms HOW LONG IS THE WARRANTY Labor and parts are warranted for three year 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
10. W 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 For the name of the nearest Kramer authorized service center consult your authorized dealer gt 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 Kramer s liability for any defective 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
11. a high quality video stereo amplifier which compensates for video and audio signal losses when long cables are used In any video audio setup requiring considerable distances between video audio source and acceptors signal loss and thus depreciation in the quality of both picture and sound is a real problem To prevent this phenomenon a VM 9S amplifier is installed adjacent to the video audio source KRAMER ELECTRONICS LTD 4 VS 4E A precision mechanical 4x4 video audio switcher Several video audio sources may be connected to its inputs for switching The machine may be used in every application where easy and fast video and audio source selection is needed and for high isolation between inputs All unselected inputs are internally terminated with 75 Ohm resistors The VS 4E switches video SDI and any other high frequency signals The VS 4E is housed in a small enclosure occupying very little desk space VS 81AV A precision mechanical 8x1 video stereo audio switcher Several video audio sources may be connected to its inputs for switching The machine offers fast and easy video audio source and acceptor selection The VS 81AV provides high isolation between inputs and outputs and all unselected video inputs are internally terminated with 75 Ohm resistors The VS 81AV is housed in a professional 19 rack mountable enclosure VS 801xl 8 1 Composite or Single Component video amp unbalanced audio switcher Several video audio sources may
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13. e to interference they degrade signal quality due to poor matching and cause elevated noise levels They should therefore be of the best quality Sockets and connectors of the sources and acceptors So often ignored they should be of highest quality since Zero Ohm connection resistance is the target Sockets and connectors also must match the required impedance 75 ohms in video Cheap low quality connectors tend to rust thus causing flaws in the signal path Amplifying circuitry Must have quality performance when the desired end result is high linearity low distortion and low noise operation Distance between sources and acceptors Plays a major role in the final 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 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 KRAMER ELECTRONICS LTD 2 2 SPECIFICATIONS Function Inputs Type Outputs Input Coupling S N Ratio Audio Bandwidth Video Bandwidth Max video Output Differential Gain Differential Phase Audio THD N K Factor Dimensions W D H Weight Power Source
14. fier gt AC power cable where applicable gt User Manual gt Rubber feet For additional information regarding optional cables and additional accessories contact your Kramer dealer 4 1 Optional Accessories The following Kramer accessories can enhance implementation of your amplifier gt Rack Adapter Used to install small machines in a standard 1U rack One or more machines may be installed in each adapter gt BNC Y Connector Splits the incoming signal for looping purposes to enable connection of an additional machine gt SP 40 video audio Processor Serially connected between the video audio source and the VM amplifier for video and audio processing The machine is a high quality processor used for video control and correction in duplication and production studios camera control luminance and white balance correction The SP 40 is capable of Composite to Y C conversion and bi directional Transcoding The machine allows video gain control down to full fade definition control contrast control color saturation control black level control audio mix control for mixing between the selected source and an audio AUX source and a screen splitter control for before after comparison The unique limiter switch in the SP 40 allows true signal limiting and special effects gt SP 11 video audio Processor can be serially connected between the video audio source and the VM amplifier for video and audio control c
15. gure 1 and Table 1 CH2 ADJ CH1 ADJ O O O O HF LEVEL HF LEVEL pil or KRAMER ELECTRONICS LTD 6 CH2 ADJ CH1 ADJ O O O O HF LEveL HF LEVEL CH 1 IN CH 2 IN _ 0 0 6 6 759 1 8 750 CH 1 OUT CH 2 OUT bodd b E Figure 1 VM 80V Front Rear Panel Features Table 1 VM 80V Front Rear Panel Features Feature Function POWER Illuminated power switch Supplies power to the unit on front panel HF CHANNEL 2 LEVEL CHANNEL 2 HF CHANNEL 1 LEVEL CHANNEL 1 Channel 1 INPUT ae 1 8 Selector Switch Channel 2 INPUT ie Channel 1 OUT Channel 2 OUT Power connector A 3 prong AC connector allows power to be supplied to the unit Directly underneath this connector a fuse holder houses the appropriate fuse KRAMER ELECTRONICS LTD 7 5 2 Getting To Know Your VM 10AN Amplifier The Kramer VM 10AN is a compact high quality 1 10 distribution amplifier using BNC connectors for composite video and RCA connectors for stereo audio signals It accepts one set of inputs provides correct buffering and isolation and distributes it to up to ten identical outputs designed to drive monitors projectors and other receiving devices Bandwidth exceeding 70MHz ensures transparent performance with typical video and audio sources Looping inputs make it easy to expand to larger distribution systems The VM 10AN can also be mounted in a standard 19 rack using the RK 10 kit which holds one unit in two
16. he 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 5 5 VM SERIES AMPLIFIERS This section describes all the controls and connections of your amplifier Understanding the controls and connections helps you realize its full power 5 1 Getting To Know Your VM 80V The Kramer VM 80V is a broadcast quality distribution amplifier designed primarily for composite video signals on BNC connectors Using a simple rear panel switch it can be configured either as a single 1 8 DA or as two separate 1 4s In either mode its purpose is to provide identical outputs to drive multiple monitors projectors or other receiving devices Bandwidth exceeding 330MHz ensures transparent performance even with high resolution analog and SDI serial digital video signals The inputs can be un terminated to provide looping capability making it easy to create larger systems The VM 80A is the companion unit for distributing balanced audio signals Two sets of recessed front panel controls are provided for fine tuning of gain and high frequency EQ The VM 80V is housed in a rugged professional half rack enclosure with an internal power supply connected by a standard detachable AC power cord Two 80 series products can be mounted in one vertical rack space using the RK 80 kit Front Rear panel features of the VM 80V are described in Fi
17. nt of a DA allowing the DA to distribute a video signal and two audio signals simultaneously It sends a color video signal and a stereo audio signal in real time using only one standard coax cable The machine maintains the bandwidth of an industrial color video signal and the output signal may be viewed and recorded as a normal video signal By using the VA 11 together with the VA 12 video audio Separator the audio stereo signal may be recovered so audio signals may be sent in a hidden mode to be recovered only by the VA 12 The VA 11 can be used for simplification of security and CCTV installations using existing video coax wiring for video and audio transmissions 611T 611R 611T Fiber Optic Transmitter and 611R Fiber Optic Receiver Part of the KRAMER TOOLS series and designed for studio and other demanding applications these machines in combination may be used to send one of the distributed channels to distances of 5 25Km The full bandwidth 611T and matching 611R use state of the art fiber optic circuitry and allow the user via rear panel trimmers to adjust input and output video levels and high frequency peaking to achieve best performance 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 t
18. orrection The machine provides camera control and luminance white balance correction The SP 11 is also capable of performing composite to Y C conversion and bi directional transcoding The machine allows full control over the video signal video gain down to full fade log or linear definition control log or linear contrast control color saturation control black level control red green and blue controls and a screen splitter control for before after comparison The Input switch control is audio follow video gt 104L video Line Amplifier Serially connected between the video source and the VM amplifier the machine is used for video line amplification and cable compensation video field work and SDI signal distribution Signal loss and the resulting depreciation in picture quality is a real problem in any video setup requiring considerable distance between video source and acceptors The KRAMER 104L video Line Amplifier one of the KRAMER TOOLS is a high quality amplifier which prevents video signal losses over long cables For best results the 104L amplifier is installed adjacent to the video source The 104L is housed in the compact KRAMER TOOLS enclosure and is fed by a 12VDC source High bandwidth and front accessible controls make it suitable for the most demanding analog and SDI studio applications gt VM 9YC video audio Line Amplifier Serially connected between the video audio source and the VM amplifier the machine is
19. t head screwdriver remove fuse holder located directly below the power connector on your amplifier Confirm that the fuse is good by looking for the wire connected between the ends of the fuse If the wire is broken replace the fuse with another with the same rating gt For model VM 10AN perform the following Remove the power cord from the AC outlet and then using a philips screwdriver carefully remove the cover of the machine Locate the fuse near the power socket on the printed circuit board Confirm that the fuse is good by looking for the wire connected between the ends of the fuse If the wire is broken replace the fuse with another with the same rating Reinstall the cover of the machine 11 2 Audio Signal VM 10AN Only Problem No audio at the output Confirm that your sources and output device are turned on and connected device Regardless of Input properly Audio signals connected to the input of your amplifier should be Selected properly wired to the output of your source Audio signals connected to the output of your amplifier should be properly wired to the input of your amplifier 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 amplifier or recording device Audio level is too low Confirm that the connecting cables are of high quality and properly built Take special care in no
20. the power cord from the wall outlet 2 Using a Philips screwdriver remove the screws from the cover and remove the cover 3 Locate the internal jumper on the internal printed board near the input sockets and remove it 4 Reinstall the cover KRAMER ELECTRONICS LTD 9 9 5 2e 2e ae 2e x ko x ko x Operating the VM 80V Connect a cable from the video sources to the input sockets of the VM 80V If a 1 8 operation is needed press the rear button marked 1 8 If looping is needed release the rear termination switch If looping is not needed press the switch in to the 75 Ohm position If 1 8 operation is selected one of the termination switches should always be in Hi Z state released and the other according to looping requirements Connect up to 8 acceptors to the OUTPUT sockets Adjust if necessary the trimmers on the front panel of the machine to achieve best results Connect a mains power source to the socket on the rear panel of the VM 80V Operate source acceptors and the VM 80V machine 9 6 Operating the VM 10AN 10 11 Connect a video cable from the video source to the video input socket of the VM 10AN and an audio stereo cable from the source to the Right and Left Audio inputs sockets If looping is needed release the rear termination switch If looping is not needed press the switch in to the 75 Ohm position Connect up to 10 Video Audio stereo acceptors to
21. ting the wiring configuration of balanced to unbalanced cables Check level controls located on your source input device or output device KRAMER ELECTRONICS LTD 11 11 3 Video Signal VM 80V VM 10AN No video at the output device regardless of input selected Video level is too high or too low Confirm that your sources and output device are turned on and connected properly Video signals connected to the input of your amplifier should be of an identical signal format at the output of your source Video signals at the output of your amplifier should be of an identical signal format as at the input of your display or recorder Confirm that any other amplifiers 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 amplifier see section 4 1 Video Tester The amplifiers in this manual have termination switches on each input Verify that the video line is well interfaced through 75ohm impedance otherwise it results in a video level that is too high or too low Check if looping is used and if termination switch is in the proper position for this state Confirm that the connecting cables are of high quality properly built and terminated with 75ohm BNC connectors Check level controls located on your source input device or output device Adjust VM 80V only if necessary video output levels using the front panel trimmers Bear in mind that the machine
22. to place NOTE All products returned to Kramer for service must have prior approval This may be obtained from your dealer NOTICE 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 light industry environment CFR 47 FCC Rules and Regulations Part 15 Radio frequency devices Subpart B Unintentional radiators CAUTION Servicing of the above mentioned machines is only allowed to a Kramer authorized technician or Engineer Any user who makes changes or modifications to the unit without the express approval of the manufacturer will void user authority to operate the equipment Use the DC power supply provided to supply power to the machine and controllers Please use recommended interconnect cables to connect the machine to controllers and other components 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 CE P N eee Rev 4 Kramer Electronics Ltd Web site www kr
23. tor must always switch the termination switch of all the amplifiers but the last to Hi z The last amplifier s termination switch should always be at 750hm to maintain well matched video line of 750hm impedance from first to last amplifier Note that if looping function is not used the termination switch should be set to 75 ohm Coupling The coupling function enables the operator to determine whether the incoming video signal is DC or AC coupled When DC coupling is selected and proper standard video signal is applied to the amplifier s input the output signal is equal to the input signal When AC coupling is selected DC components of the incoming signal are removed DC coupling is in general preferable at it allows full signal transparency AC coupling in some occasions might cause some linearity distortions in low and high frequencies due to undesirable behavior of capacitors However a problem may arise when the incoming signal is riding on a large DC offset level especially when the acceptors are highly effected by deviation of DC offsets A to D converters LCD monitors etc which in turn results in a distorted picture For these cases AC coupling should be selected Coupling Selection The VM 80V and the VM 10AN come from the factory with DC coupling Selecting AC Coupling is performed by removing the internal jumper To remove jumper perform the following steps 1 Disconnect the machine from the mains supply by removing
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