V8 User Guide
`
`Virtual Research Systems,
`Inc.
`
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`Limited Warranty
`As of September 1998, the information contained in this publication is believed to be
`reliable, but Virtual Research Systems, Inc. makes no warranties as to its accuracy or
`completeness and has no responsibility to update or correct such information.
`
`Virtual Research makes no warranties, express or implied, that the product is free of error or
`is consistent with any particular standard of merchantability or the product will meet
`requirements for any particular application. The product should not be relied upon for
`solving a problem or fulfilling a function whose indirect solution or operation could result in
`injury to a person or loss of property. If the product is used in such manner, it is at the
`product users own risk.
`
`Other than as set forth in this paragraph, in no event will Virtual Research be liable for
`damages, including lost profits, lost savings or other incidental or consequential damages
`arising out of the use or inability to use the product, even if Virtual Research or an
`authorized dealer has been advised of the possibility of such damages. Virtual Research
`warrants to the original purchaser that it(cid:146)s products are free of defects in materials and
`workmanship and will remain so for a period of six (6) months from the date of delivery.
`If Virtual Research is unable to repair or replace any of its products to a condition as
`warranted, the buyer shall be entitled to a refund of the purchase price upon return of the
`product to Virtual Research. The liability of Virtual Research for damages hereunder shall, in
`the aggregate, in no event exceed the amount of such purchase price. This warranty does not
`apply to any product which has been subjected to misuse, negligence, alternation,
`accident, improper maintenance, or damage by excessive physical or heat stress.
`
`THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES
`AND CONDITIONS EXPRESSED, IMPLIED OR STATUTORY AND ALL OTHER
`LIABILITIES OF VIRTUAL RESEARCH, WHETHER IN CONTRACT, TORT OR
`ANY OTHER LEGAL THEORY.
`
`Copyright 1998 Virtual Research Systems, Inc. Revision#2 All rights reserved.
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`Table of Contents
`
`Page
`
`Introduction......................................................................................... 1
`
`Safety Issues ........................................................ 1
`Section One
`Electrical Shock and Hazard ..................................................................................... 1
`Blocked Vision and Hearing ...................................................................................... 1
`Eyestrain/other optical effects .................................................................................... 1
`Lice/other pests transmission between users .............................................................. 1
`
`Getting Started ....................................................2
`Section Two
`Box Contents ........................................................................................................... 2
`Out of the Box Set Up .............................................................................................. 2
`V8 Control Box Features .......................................................................................... 3
`Rear Panel Diagram ...................................................................................... 3
`Front Panel Diagram ..................................................................................... 3
`Power ...................................................................................................................... 4
`HMD Output ............................................................................................................ 4
`Monitor Out ............................................................................................................. 4
`Mono/Stereo ............................................................................................................ 4
`Brightness and Contrast ............................................................................................ 4
`Video Formats ......................................................................................................... 4
`Audio ....................................................................................................................... 4
`Microphone .............................................................................................................. 4
`Pin Out Information .................................................................................................. 5
`Connecting HMD to Computer ................................................................................. 5
`
`Computer Interfacing Manual .......................... 6
`Section Three
`PC/Intergraph ........................................................................................................... 6
`O2 ........................................................................................................................... 6
`Indigo Impact ........................................................................................................... 6
`Octane ..................................................................................................................... 7
`Onyx 2 ..................................................................................................................... 8
`Onyx with Multi Channel Option (MCO) .................................................................. 9
`Camera/NTSC Inputs ............................................................................................... 9
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`Section Four
`
`Using Position Sensors ....................................... 9
`
`Mechanical Adjustments .................................. 10
`Section Five
`Ratchet Knobs ....................................................................................................... 10
`Interpupillary Adjustments (IPD) ............................................................................. 10
`Fore/AFT Motion ................................................................................................... 10
`Focus ..................................................................................................................... 11
`Overlap Adjustment ................................................................................................ 11
`Headphones ........................................................................................................... 11
`Cable Positioning .................................................................................................... 11
`Cleaning V8 Lenses and Optics .............................................................................. 11
`Donning the V8 ...................................................................................................... 12
`
`Technical Adjustments ..................................... 13
`Section Six
`Power Requirements ............................................................................................... 13
`Stereoscopic Viewing ............................................................................................. 13
`
`Trouble Shooting..............................................................................14
`
`Glossary............................................................................................. 16
`
`FCC Statement ................................................................................. 18
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`Introduction
`Thank you for purchasing the Virtual Research V8 Head Mount Display (HMD). This V8 User(cid:146)s Guide
`describes the contents of the V8 HMD and control box along with operational guidelines, instructions
`and care for the V8. Please review this guide carefully and follow instructions to insure correct use and
`care for your HMD. Please feel free to contact us with any questions you may have. You can reach us
`at: info@virtualresearch.com
`
`Section One: Safety Issues
`
`Electrical Shock Hazard
`The desktop power supply included with the V8 produces 24VDC. This voltage is also present on the
`HMD cable bundle, but should not be a hazard to the user. The circuitry in the HMD produces a high
`voltage (>500VAC) spike signal to drive the backlight. This voltage is generated at very low current
`levels and will cause only a moderate sensation when touched. This voltage is accessible only if the
`HMD is disassembled. DO NOT DISASSEMBLE THE V8.
`
`Blocked Vision and Hearing
`By its nature, a head mount display blocks the user(cid:146)s sight and hearing. The danger of tripping over
`cables or other obstacles becomes a real concern while immersed in the virtual world. As system
`manager, you must provide an environment that does not allow the HMD user to fall or otherwise injure
`him/herself. We recommend using V8 only while seated to avoid tripping hazards.
`
`Eyestrain/Other Optical Effects
`V8 will cause eyestrain if the IPD is set incorrectly. Like all head mounts, it is likely to cause some
`eyestrain effects even when correctly adjusted. This eyestrain stems from several causes; with
`perhaps the most significant being the fixed focal plane, which conflicts with the variable depth cues
`present in the imagery. There is no technology that we are aware of that corrects this conflict. Other
`sources of eyestrain could include optical aberrations, distortion, and mismatch of computer imagery
`with mechanical configuration. If you experience noticeable eyestrain, review and correct your
`adjustments and software configuration. If eyestrain persists, limit or end your use of the HMD.
`Please contact Virtual Research if you have questions or concerns about eyestrain.
`
`Lice/Other Pest Transmission between Users
`Although we have not had any instances of user(cid:146)s reporting lice transmission to us, there has been at
`least one anecdotal report of lice transmission in a public use HMD. There are sprays available that will
`kill lice on furniture and clothing. Two of these are RID and A-200. Both are available in drug stores.
`We don(cid:146)t have information on the effectiveness of these sprays on HMDs and encourage you to
`research this if you are considering a multiple user application. These sprays are hazardous and you
`need to judge the benefits vs. risks of using them. Alcohol wipes are useful for cleaning the HMD
`between users. Alcohol will remove skin, oil and makeup that have been transferred to the HMD. As
`far as we know, alcohol has no effect on lice.
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`Section Two: Getting Started
`Please contact Virtual Research Systems, Inc. immediately if you find that any of the contents listed
`below are not present or have arrived damaged. Virtual Research Systems, Inc. (408) 748-8712
`
`Box Contents
`1) V8 HMD with 13 ft. cable.
`2) V8 control box
`3) Universal power supply
`4) Power cord
`5) No-fog cloth
`
`Universal Power Supply:
`Input AC
`115/230 V~
`0.9 / 0.45A
`60/50 Hz
`
`Output DC - Max 30W
`+5V - - - 3A
`+24V - - - 0.7A
`-12V - - - 0.5A
`
`Out of the Box Set Up
`Prior to opening your V8 HMD boxes, be sure you have plenty of room and a hard stable surface to
`work on. We suggest keeping all packing materials for future shipping purposes.
`
`Sale units will include an extra box containing a styrofoam display head. Demo units will not include a
`styrofoam display head. Please treat demo units with additional care.
`
`Open the smaller of the two boxes and remove Styrofoam head. This head is to be used
`Step One
`to place HMD on while not in use or while connecting HMD to your computer.
`
`Carefully open the side of the box which the shipping label is affixed. *This denotes
`Step Two
`the top of box. The arrow on the side of the box should be facing down,
`
`Step Three Remove the top layer of foam to reveal HMD.
`
`Step Four
`
`Remove the HMD and the foam packaging to gain access to the power supply and
`power cord. The V8 control box is located in a separate foam pocket by itself within
`this area. Look under the foam cut out to reach the control box.
`
`Each V8 comes with serial numbers located on the position sensor mounting plate and the control box.
`DO NOT REMOVE. Removing these serial numbers may void the Virtual Research six (6) month
`warranty.
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`V8 Control Box Features
`
`Rear Control Box Panel
`
`Front Control Box Panel
`
`The V8 was designed to accept a 640 x 480 60 Hz, non-interlaced input signal. This format is often
`referred to as standard VGA. The connection is made via a 15-pin HD connector similar to that found
`on PC monitors. All inputs on the V8 control box are (cid:147)female(cid:148), refer to the Computer Interfacing
`Manual (Section 3) for cable requirements that are compatible with the V8 and your system. The V8
`control box auto-detects when one input channel (left eye/mono) is being used and feeds an identical
`signal to both displays. The control box automatically switches to stereo mode when a second video
`source is connected to the right eye stereo input. The right eye source must also be standard VGA
`format and the same sync configuration as the left eye source. (i.e. cannot have separate sync on left
`and comp sync on right.)
`
`The V8 control box is designed to accept either separate Horizontal and Vertical sync, composite sync
`on green video, or composite sync on the Horizontal sync line. When providing composit sync on the
`Horizontal sync line the Vertical Sync line should not be driven. When sync on green video is
`provided, both the Horizontal and Vertical sync lines should be undriven. Sync signals should be TTL
`levels. The VGA source is an analog signal, and since the V8 does not quantify the video (as in A/D
`and D/A conversion), it is capable of displaying any number of colors your graphics card is able to
`produce.
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`Power
`Virtual Research supplies a desktop power supply unit with each V8. The power supply has (110 VAC -
`220 VAC) universal input, +5, +24. -12 VDC output. It is important that the correct power supply be
`used to avoid damage to the unit. Do not use a different power supply than that supplied by Virtual
`Research.
`
`50 Pin SCSI Connector
`Do not connect or disconnect the HMD(cid:146)s 50 Pin SCSI connector while the control box power is on.
`
`Monitor Out
`To use an external monitor while using your V8 HMD, be sure to have a cable running from the
`(cid:147)MONITOR OUT(cid:148) connection on the control box into the back of your monitor. Refer to Interfacing
`Manual in Section 3 for the type of cable needed to connect from the V8 control box (cid:147)MONITOR OUT(cid:148)
`connection to the back of monitor.
`
`Mono/Stereo
`The stereo indicator LED will illuminate when a second video source is connected to the (cid:147)Right Eye(cid:148)
`Input.
`
`Brightness and Contrast
`These controls affect overall brightness and contrast of both displays. The displays are individually
`matched to one another during assembly. Please contact Virtual Research if you have any questions.
`
`Video Formats
`The V8 HMD accepts a VGA (640x480 60 Hz.) video format. The V8 does not accept NTSC, PAL or
`SECAM timing. It is possible to connect a V8 to any of these sources with the proper video format
`converter. Contact Virtual Research for details on your system.
`
`Audio
`The audio connection is a standard stereo 3.5mm mini jack. The control box passes the audio signal
`directly to the V8 headphones. Audio signal level supplied to the control box should be the same
`signal that would be supplied directly to stereo headphones.
`
`Microphone (optional)
`Contact Virtual Research for details.
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`Pin Out Information:
`VGA input connector format
`15 pin high density HD female connector
`
`Pin
`1
`2
`3
`4
`5
`6
`7
`8
`9
`10
`11
`12
`13
`14
`15
`
`Signal
`Red
`Green
`Blue
`Ground
`n/c
`Ground
`Ground
`Ground
`n/c
`Ground
`Ground
`n/c
`Horizontal sync
`Vertical sync
`n/c
`
`Connecting the V8
`** REMINDER: Refer to the Interfacing Manual (Section 3) to see which cables are required to
`successfully interface the V8 HMD to your system. **
`
`Step One Mono/Left Eye Input
`Connect one cable from the (cid:147)Left Eye(cid:148) input (mono) into the graphics channel of your
`system.
`
`Step Two
`
`Stereo/Right Eye Input
`Connect a second cable from the (cid:147)Right Eye/Stereo(cid:148) Input to the second graphics
`channel of your computer. You must have two graphics channels to run your V8 in
`stereo. ** Reminder all V8 control box inputs are female, so you must use male
`connections from the control box to whatever connection your computer accepts.
`Refer to the Interfacing Manual in Section 3. **
`
`Step Three External Monitor Option
`Connect your external VGA monitor to the V8 Control box (cid:147)Monitor Out(cid:148) connection.
`
`Step Four Connecting V8 to control box
`Secure the HMD(cid:146)s 50 Pin SCSI connector to the Control box.
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`Section Three: Computer Interfacing Manual
`
`PC/INTERGRAPH
`Use a standard 15 pin male to 15 pin male (VGA) cable(s) to connect the V8 control box to your graphics
`boards(s). Two graphics boards (channels) are required for stereoscopic viewing (i.e. one for left eye
`viewpoint and one for right eye viewpoint.) Change the video output format of your graphics to
`standard VGA (640 x 480 60Hz). For example, Windows NT users will go to:
`
`Control Panel / Settings / Display
`
`Select 640 x 480 as the screen resolution, and 60Hz frame rate. Users may connect their monitor to the
`V8 control box (cid:147)Monitor Output(cid:148) connector via another VGA cable to view the same image that(cid:146)s seen
`in the HMD.
`
`O2
`Like the PC configuration above, use a standard 15 pin male to 15 pin male (VGA) cable to connect the
`V8 control box to the Monitor connector on the rear of your O2. Since the O2 only has the one graphics
`output, stereoscopic (3D) viewing is not possible. Use the (cid:147)setmon(cid:148) command to change the video
`format output (vfo) to standard VGA (640x480 60Hz). Those users not familiar with the (cid:147)setmon(cid:148)
`command should contact Silicon Graphics or run a (cid:147)man(cid:148) page on the (cid:147)setmon(cid:148) command for further
`details. The (cid:147)setmon(cid:148) command should look something like:
`
`%/usr/gfx/setmon 640x480_60.vfo
`
`Users may connect their O2 monitor to the V8 control box (cid:147)Monitor Output(cid:148) connector via another
`VGA cable to view the same image that(cid:146)s seen in the HMD.
`
`INDIGO IMPACT
`The standard Indigo Impact does not support a VGA graphics format, only higher resolution
`workstation formats like 1280 x 1024 and 1024 x 768. V8 users have the following 3 options to choose
`from.
`
`Option 1 - Silicon Graphics offers Impact customers the Impact Channel Option (ICO) which supports
`many different graphics formats including VGA (640 x 480 60Hz). Use the (cid:147)setmon(cid:148) command to change
`the video format outputs (vfo) of the ICO to the VGA (640x480 60Hz) format found among the list of
`available vfo(cid:146)s. Those users not familiar with the (cid:147)setmon(cid:148) command should contact Silicon Graphics
`or run a (cid:147)man(cid:148) page on the (cid:147)setmon(cid:148) command for further details. The (cid:147)setmon(cid:148) command should look
`something like:
`
`%/usr/gfx/setmon 640x480_60_ext
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`The (cid:147)_ext(cid:148)command will enable the ICO to output separate H and V syncs. Use a 15 pin to 5 BNC (R, G,
`B, H sync, V sync) breakout cable(s) to connect the V8 control box to one of four channels located on
`the ICO. Stereo users will use 2 channels and 2 cables (one for left eye and one for right eye). Connect
`all 5 BNCs (Red, Green, Blue, H sync and V sync) to the ICO and the 15 pin to the V8 control box. Since
`only one H sync and V sync BNC is available for all four channels, customers running in stereo will
`need to T the H sync and V sync BNC(cid:146)s to provide 2 connection points for each. Alternatively, ICO
`users may download a separate VGA vfo from Virtual Research(cid:146)s web site http://
`www.virtualresearch.com in order to run V8 in sync on green mode. After downloading and placing this
`new vfo in the correct directory, use the (cid:147)setmon(cid:148) command as before except use the new vfo. The
`command will look something like:
`
`%/usr/gfx/setmon 640 x 480_60_vr
`
`Use the same 15 pin to 5 BNC (R, G, B, H sync, V sync) cable, but this time do not connect the H and V
`sync.
`
`Option 2 - External video converters (1280x1024 to VGA or 1024x768 to VGA) are available from 3rd
`party vendors that will enable users to interface V8 to their Indigo Impact. Since only one graphics
`channel is available, stereoscopic (3D) viewing is not possible.
`
`Option 3 - Silicon Graphics offers Impact customers the Impact Video Option (IVO) that supports
`standard NTSC and s-video formats. V8 users can then convert this video format to standard VGA
`using an external video converter (NTSC to VGA). These converters are available off of the shelf at
`computer and workstation related stores. Since only one graphics channel is available, stereoscopic
`(3D) viewing is not possible.
`
`OCTANE
`The standard Octane currently does not support a VGA graphics format, only higher resolution
`workstation formats like 1280 x 1024 and 1024 x 768. This may change in the near future, but for now V8
`users have the following three options to choose from.
`Option 1 - Silicon Graphics offers Octane customers the Octane Channel Option (OCO) which supports
`many different graphics formats including VGA (640 x 480 60Hz). Use the (cid:147)setmon(cid:148) command to change
`the video format outputs (vfo) of the OCO to the VGA (640x480 60Hz) format found among the list of
`available vfo(cid:146)s. Those users not familiar with the (cid:147)setmon(cid:148) command should contact Silicon Graphics
`or run a (cid:147)man(cid:148) page on the (cid:147)setmon(cid:148) command for further details. The (cid:147)setmon(cid:148) command should look
`something like:
`
` %/usr/gfx/setmon 640x480_60_ext
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`The (_ext) command will enable the OCO to output separate H and V syncs. Use a 15 pin to 5 BNC (R,
`G, B, H sync, V sync) breakout cable(s) to connect the V8 control box to one of four channels located
`on the OCO. Stereo users will use 2 channels and 2 cables (one for left eye and one for right eye).
`Connect all 5 BNCs (Red, Green, Blue, H sync and V sync) to the OCO and the 15 pin to the V8 control
`box. Since only one H sync and V sync BNC is available for all four channels, customers running in
`stereo will need to T the H sync and V sync BNC(cid:146)s to provide 2 connection points for each.
`Alternatively, OCO users may download a separate VGA vfo, developed by SGI for Virtual Research,
`from Virtual Research(cid:146)s web site http://www.virtualresearch.com in order to run V8 in sync on green
`mode. After downloading and placing this new vfo in the correct directory, use the (cid:147)setmon(cid:148) command
`as before except use the new vfo. The command will look something like:
`
`%/usr/gfx/setmon 640 x 480_60_vr
`
`Use the same 15 pin to 5 BNC (R, G, B, H sync, V sync) cable, but this time do not connect the H and V
`sync.
`
`Option 2 - External video converters (1280x1024 to VGA or 1024x768 to VGA) are available from third
`party vendors that will enable users to interface V8 to their Octane. Since only one graphics channel is
`available, stereoscopic (3D) viewing is not possible.
`
`Option 3 - Silicon Graphics offers Octane customers the Octane Video Option (OVO) that supports
`standard NTSC and s-video formats. V8 users can then convert this video format to standard VGA
`using an external video converter (NTSC to VGA). These converters are available off of the shelf at
`computer and workstation related stores. Since only one graphics channel is available, stereoscopic
`(3D) viewing is not possible.
`
`ONYX 2
`A 13W3 to 15 pin (VGA type) cable will be required (2 cables for stereo) to connect to the V8 control
`box to the Onyx 2. We use a cable that contains dipswitches on the 13W3 connector and suggest our
`customers use the same. These dipswitches allow users to isolate particular pins for various sync
`modes. If your 13W3 to 15 pin cable does not have these switches, please try the following options
`and let us know what you find.
`
`Option 1 - Use (cid:147)ircombine(cid:148) to configure all available graphics channels (usually 2 or 8) for VGA
`resolution. All available Channels must be configured before clicking (cid:147)Download(cid:148). If you are
`unfamiliar with the (cid:147)ircombine(cid:148) command we suggest that you run a (cid:147)man(cid:148) page to learn more about it.
`The VGA vfo for the channel or channels used by the HMD should look something like: 640x480_60
`Select this format and change the default sync configuration of (cid:147)Composite(cid:148) sync on green to separate
`(cid:147)Horizontal(cid:148) and Vertical. This is done by clicking on the (cid:147)Composite(cid:148) sync box menu and selecting
`(cid:147)Horizontal(cid:148). You will also need to de-select the check mark in the green box denoting that the sync
`signal will appear on green. All three boxes (cid:147)R(cid:148), (cid:147)G(cid:148), and (cid:147)B(cid:148) should not contain a check. Lastly, set
`the dipswitches of the 13W3 to 15pin cable for separate H and V sync. Click (cid:147)Download(cid:148) to start.
`Option 2 - Silicon Graphics has written a special vfo.cmb file for Virtual Research(cid:146)s V8 that may be
`
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`downloaded from our web site (www.virtualresearch.com). This vfo will allow the V8 to operate in sync
`on green mode. After downloading this new vfo and placing it in the correct directory, use (cid:147)ircombine(cid:148)
`to again configure all available channels. Note that the Onyx 2 supports the ability to run a variety of
`resolutions at once (i.e. Channel 1 outputting 640x480 60Hz and Channel 2 outputting 1280x1024 60Hz).
`However, please review your SGI Onyx 2 manual, as there are some restrictions. After configuring at
`least one channel with this new vfo(640 x 480_60.pc), select (cid:147)Composite(cid:148) sync and check the (cid:147)G(cid:148) box
`for sync on green mode. You will also need to set the dipswitches of the 13W3 to 15 pin cables for
`sync on green support. Click (cid:147)Download(cid:148) to begin.
`
`ONYX with MULTI CHANNEL OPTION (MCO)
`Previous generations of the Onyx series machines used the Multi Channel Option (MCO) for
`supporting multiple output channels and stereoscopic viewing for HMDs. Use the (cid:147)setmon(cid:148) command
`to change the video format outputs (vfo) of the MCO to VGA (640x480 60Hz) with separate H and V
`sync. Those users not familiar with the (cid:147)setmon(cid:148) command should contact Silicon Graphics or run a
`(cid:147)man(cid:148) page on the (cid:147)setmon(cid:148) command for further details. It is best to conduct the following
`configuration from a remote terminal, as the Onyx(cid:146)s Monitor will disengage when the MCO is activated.
`Reverting back to the original settings may be difficult if any problems arise. The (cid:147)setmon(cid:148) command
`should look something like:
`
`%/usr/gfx/setmon -S -s 640x480_60.vfo
`
`A (cid:147)man(cid:148) page on the (cid:147)setmon(cid:148) command will further explain the use of parameters like (cid:147)-S(cid:148) and (cid:147)-s(cid:148).
`Use a 15 pin to 5 BNC (R, G, B, H sync, V sync) breakout cable(s) to connect the V8 control box to the
`desired channel(s) of the MCO. Stereo users will use 2 channels and 2 cables (one for left eye and one
`for right eye). Connect all 5 BNCs (Red, Green, Blue, H sync and V sync) to the MCO.
`
`CAMERA/NTSC INPUTS
`V8 users can convert NTSC and SVHS video formats to standard VGA using an external NTSC to VGA
`video converter. These converters are available off of the shelf at most computer stores. As with
`computer interfaces, 2 inputs are required for stereoscopic viewing.
`
`Section Four: Using Position Sensors
`
`Position Sensors: V8 is designed to support a variety of position sensing options. The position sensor
`mounting plate behind the top ratchet provides mounting screws for Polhemus (Fastrak, Isotrak,
`Insidetrak), Ascension Flock of Birds and the Intersense series of sensors.
`
`* The Logitech Ultrasonic sensors require a triangular mounting pattern. Virtual Research can supply
`(at no charge) a second position sensor mounting plate for the Logitech receiver.
`Other sensors are becoming widely available. If you would like to mount another sensor, beside the
`above options, please contact Virtual Research. We are always glad to have feedback on your
`experience with new sensors.
`Position sensor cabling is most easily handled if you attach it to the V8 cable bundle. This can be done
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`with electrical tape wrapped at about 18(cid:148) intervals around both cables. However, this can leave a sticky
`residue when you remove the tape. We do not recommend plastic cable ties since they tend to snag on
`their surroundings. If you order a V8 and a position sensor together from Virtual Research, we can
`attach the position sensor to the V8 at time of assembly.
`
`If you are using an electromagnetic position sensor, you will get better performance if you mount the
`transmitter above the user(cid:146)s head rather than below. The clear path from transmitter to receiver reduces
`noise possibly induced by the V8.
`Section Five: Mechanical Adjustments
`
`Ratchet Knobs
`The ratchet knobs adjust the size of the HMD making it possible to secure the HMD snuggly to your
`head. To open turn ratchet knobs counter clockwise and to close turn ratchet knobs clockwise.
`Tension of ratchet knobs can be adjusted by turning the Phillips screw at center of knob.
`
`Interpupillary Distance (IPD)
`Interpupillary distance is the distance between the right and left pupils. Adjustments are made via the
`dual function knobs located at the front of the V8 HMD shell. Twist knobs until both images are evenly
`visible. Close one eye at a time to confirm the image is centered in front of the eye. Incorrect
`positioning of the IPD adjustment may lead to eyestrain.
`Range: 52mm - 74mm.
`
`Fore/AFT Motion - Eye Relief
`Slide the dual function IPD knobs forward and back to adjust eye relief (the distance between the eyes
`and optics). This allows the V8 to be worn with glasses. It is best to don the HMD with the optics in
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`the fully forward position. Grasp both IPD knobs together and slide them toward the front of the HMD.
`After the HMD is on the head, pull IPD knobs toward the face until a suitable distance is set. The
`closer the optics are to the eyes, the greater the immersive effect. Eye Relief Range: 10mm - 30mm.
`
`Focus
`There are no focus adjustments on the V8. If you wear glasses we strongly encourage that you keep
`them on while using the V8 HMD.
`
`The V8 focal plane is set at 3 ft. If you wear glasses for Myopia, Hyperopia or Presbyopia and you can
`adjust within this focal plane, then you may not need to wear your glasses. If you think you may have
`trouble viewing within this focal plane, then wear your glasses while using the V8 HMD.
`* If you have astigmatism, you must wear your glasses while using the V8. *
`
`Overlap Adjustment
`Contact Virtual Research for information.
`
`Headphones
`Headphones are designed to pivot on the sides of the headband. When donning the V8 unit, rotate the
`headphones above the headband. After video is adjusted, pull the headphones down. This makes
`fitting faster and easier.
`*Headphone Removal: If you are not using your HMD with audio, you can remove the V8 headphones. The
`headphone will snap off the end of the detented rod that it slides on. First remove the capture screw at the bottom of
`the rod, unplug the signal connection at the earphone, and pull down. Tuck the cable into the end of the padded leather
`on the headband to keep it from dangling and flip the arm upward.
`
`Cable Positioning
`V8 is designed to be lightweight and well balanced. The cable bundle provides a significant
`counterbalancing effect without adding weight to the product. The cable bundle should drop directly
`behind the user(cid:146)s shoulder and down the back. If the cable is draped in front of the user(cid:146)s shoulder, the
`V8 may become front heavy. The position sensor cable should follow the cable bundle to add
`additional counterbalance and to minimize the tangle of cables.
`
`Cleaning V8 Lenses and Opt