Steris VividImage MON-STE21MC-2MP User manual

VividImage®
Medical Grade
Monochrome Monitor
OPERATION MANUAL
MON-STE21MC-2MP
MON-STE21MC-3MP
MON-STE20MC-5MP
MON-STE21MC-3MP

Document # Revision Date
82070-275, Revision A 2 of 22 1/16/2009
Notice for Users
IMPORTANT:
To aid in reporting in case of loss or theft, please
record the monitor’s model and serial numbers in
the space provided. The numbers are located on
the rear of the monitor.
FCC Statement
WARNING – FCC Regulations state that any unauthorized changes or modifications to this equipment
not expressly approved by the manufacturer could void the user’s authority to operate this equipment.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the interference at
his own expense.
Declaration of Conformity
VividImage®Monochrome Monitor-
MON-STE21MC-2MP / MON-STE21MC-3MP / MON-STE20MC-5MP:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
CE:
EN 55022, EN61000-3-2, EN 61000-3-3, EN 55024, IEC 61000-4, EN 60950 (low voltage directive)
Function, Intended Application and Mode of Operation:
The VividImage®Series of monitors are intended to be used in the displaying and viewing of video and
graphics for review and analysis by trained medical practitioners. The mode of operation for this device
is continuous operation.
For a complete list of current certifications, please refer to the Specifications page of this manual.
Model No:
Serial No:
IMPORTANT:
To aid in reporting in the case of loss or theft, or for
service maintenance purposes, please record the
monitor’s model and serial numbers in the space
provided. The numbers are located on the back of
the monitor.

Document # Revision Date
82070-275, Revision A 3 of 22 1/16/2009
Table of Contents
NOTICE FOR USERS .................................................................................................................................... 2
FCC Statement .......................................................................................................................................... 2
Declaration of Conformity........................................................................................................................... 2
TIPS AND SAFETY PRECAUTIONS............................................................................................................. 4
Monitor and Accessory Checklist ............................................................................................................... 4
Mounting .................................................................................................................................................... 4
Location ..................................................................................................................................................... 4
Power Cord ................................................................................................................................................ 4
Manual Scope ............................................................................................................................................ 4
MONITOR SET-UP AND CONNECTIONS..................................................................................................... 5
Step1: Unpacking the Carton .................................................................................................................... 5
Step 2: Mounting the Monitor .................................................................................................................... 5
Figure 1: Rear View of MON-STE21MC-3MP Monitor with Cable Cover Removed........................ 5
Step 3: Connecting the Video Inputs......................................................................................................... 5
Step 4: Connecting the Power Cord.......................................................................................................... 6
Step 5: Raising and Lowering the Monitor ................................................................................................ 6
Figure 2: Screen Rotation.................................................................................................................. 6
Step 6: Tilting and Swiveling the Monitor .................................................................................................. 6
Figure 3: Tilt and Swivel .................................................................................................................... 6
USER INTERFACE ........................................................................................................................................ 7
The User Interface ..................................................................................................................................... 7
Figure 4: The Back Panel User Interface........................................................................................... 7
ON SCREEN DISPLAY – 2MP....................................................................................................................... 8
OSD Adjustments....................................................................................................................................... 8
Figure 5: OSD Display Menu ............................................................................................................. 8
OSD MENU FUNCTION – 2MP...................................................................................................................... 9
Table 1: OSD Menu Function........................................................................................................... 10
STRUCTURE OF OSD MENUS – 2MP........................................................................................................ 11
How To Lock ............................................................................................................................................ 11
How To Unlock......................................................................................................................................... 13
Quick Access Controls ............................................................................................................................. 14
ON SCREEN DISPLAY & MENU FUNCTION – 3MP & 5MP ...................................................................... 15
Table 2: OSD Menu Function........................................................................................................... 15
Quick Access Controls: ............................................................................................................................ 16
FEATURES................................................................................................................................................... 17
MONITOR CARE / TROUBLESHOOTING................................................................................................... 18
Monitor Care ............................................................................................................................................ 18
Storage .................................................................................................................................................... 18
Troubleshooting ....................................................................................................................................... 18
SPECIFICATIONS........................................................................................................................................ 19
Table 3: Specifications..................................................................................................................... 19
GLOSSARY.................................................................................................................................................. 20
INDEX........................................................................................................................................................... 21
CONTACT CUSTOMER SUPPORT............................................................................................................. 22

Document # Revision Date
82070-275, Revision A 4 of 22 1/16/2009
Tips and Safety Precautions
- Do not display a still image for ten (10) or more
hours. An afterimage may remain.
- It may be difficult to see the image on the screen
if the brightness is adjusted to the minimum
setting.
- The quality of the video signal may influence the
quality of the displayed image.
- Do not open the monitor.
- When unpacking, carrying or mounting the
monitor, at least two people are needed. Make
sure the monitor is in the upright position.
Monitor and Accessory Checklist
- Included in the carton are the following items:
1 VividImage®Monochrome Monitor
1 Power Cord
1 VGA Cable (2MP model only)
1 DVI-D cable
1 Quick Start Guide
1 Operation Manual (this document)
Notes:
- Retain the carton and packing material for
storing or transporting the monitor.
Mounting
- Always follow mounting instructions to avoid
physical injury and/or damage to the monitor.
Location
- Use the monitor in a suitable environment. See
“Operating Temperature” and “Storage
Temperature” on the Specifications page of this
manual.
-Use caution around liquids as you would with any
electrical appliance.
- Do not place the monitor on unstable surfaces.
- In all cases, refer to the specifications in this
manual to ensure proper monitor performance.
Use of the monitor outside of operating
specifications will void the monitor warranty and
may cause permanent damage to the monitor.
Power Cord
- Do not damage the power cord. Damage to the
cord may result in fire or electric shock.
- Do not add extension cords.
- Use only the power cord included with the
monitor.
- Insert the power plug directly into the AC outlet.
- Do not remove or insert the power plug with wet
hands. Doing so could result in electric shock.
Manual Scope
-This manual is written for use with the 2MP, 3MP
and 5MP Medical Grade Monochrome monitors.
When describing a different specification
between the models, the model number is given.
(When the model number is not given, the
description is true for all models. For product
appearance, illustrations of model MON-
STE21MC-3MP are used in this manual.)

Document # Revision Date
82070-275, Revision A 5 of 22 1/16/2009
Monitor Set-Up and Connections
Step1: Unpacking the Carton
Included in the carton are the following items:
1 VividImage
®
Monitor
1 Power Cord
1 VGA Cable (2MP model only)
1 DVI-D Cable
1 Quick Start Guide
1 Operation Manual (this document)
If any one of these items is missing, please call Customer Support at [phone].
Step 2: Mounting the Monitor
The monitor can be placed on the included stand or can be mounted to a VESA wall mount kit (not
included.) The VESA hole pattern (100mm) is indicated with a white dot in Figure 1 below. The monitor
also includes a 75mm VESA hole pattern.
Instructions on how to mount the monitor to a VESA mount will be included with the mounting kit.
Figure 1: Rear View of MON-STE21MC-3MP Monitor with Cable Cover Removed
*Port is for the manufacturer to load firmware. It is not for end-user utilization.
MON-STE21MC-2MP includes a D-SUB / VGA port (not shown)
Step 3: Connecting the Video Inputs
The video input cable(s) should be attached to the appropriately labeled ports on the back of the monitor as
shown in Figure 1.
Power AC In
RS232*
DVI
Vacation Switch

Document # Revision Date
82070-275, Revision A 6 of 22 1/16/2009
Step 4: Connecting the Power Cord
Plug the appropriate end of the power cord into the 3-pronged interface on the back of the monitor. Plug the
opposite end of the cord into an outlet. The Vacation Switch on the back of the monitor must be turned on.
The Vacation Switch is a true on/off switch. If this switch is in the “Off” position, the monitor cannot be
turned on using the front button. Turn on the computer. Auto Adjust automatically adjusts the monitor to
optimal settings upon initial setup. For further adjustments, refer to the OSD section of this Operation
document.
Step 5: Raising and Lowering the Monitor
The monitor may be raised or lowered in either Portrait or Landscape mode. To raise or lower, place hands
on each side of the monitor and lift or lower to the desired height.
Figure 2: Screen Rotation
Before rotating, the monitor must be raised to the highest level. To raise the monitor, place hands on each
side and lift up to the highest position, see Figure 2.
To rotate the monitor, place hands on each side and turn clockwise from Landscape to Portrait or
counterclockwise from Portrait to Landscape.
To rotate the On Screen Display (OSD) menu between landscape and portrait, refer to the “OSD Controls”
section of this document under “OSD Rotation.”
Step 6: Tilting and Swiveling the Monitor
Figure 3: Tilt and Swivel
Tilt – Grasp top and bottom sides of the monitor and adjust the tilt as desired. (If the screen is rotated
counterclockwise, the tilt function is not available.)
Swivel – Grasp right and left sides of the monitor and adjust the swivel as desired.
PortraitLandscape

Document # Revision Date
82070-275, Revision A 7 of 22 1/16/2009
User Interface
The User Interface
The monitor allows you to easily adjust the characteristics of the image being displayed. All of these
adjustments are made using the control buttons on the back of the monitor. An on screen display shows
changes as control buttons are adjusted.
Figure 4: The Back Panel User Interface
No. Button Description
1 Power
Power Indicator-
Green: Normal
Orange: Power Saving, No Signal
Off: Power Off
2 Source
“Input Source Selection” (MON-STE19MC-2MP)
“Gamma Items Selection” *(MON-STE21MC-3MP and MON-STE20MC-5MP)
3 Auto
“Mode Items Selection” (MON-STE19MC-2MP)
“Show Information” (MON-STE21MC-3MP and MON-STE20MC-5MP)
4 Enter Access and control the function of sub-menu when OSD is shown.
5 + Press the “+” to select sub-menu items and increase adjustment when OSD is shown.
6 -
Press the “-“ to select sub-menu items and decrease adjustment when OSD is shown.
(Also used to unlock OSD menu; see page 13, “How to Unlock”)
7 Menu
Start the OSD feature.
Exits the OSD controls.
Exits to the OSD main menu.
*Refer to the Quick Access Controls section on page 16.
Auto
1
2
3
4
5
6
7

Document # Revision Date
82070-275, Revision A 8 of 22 1/16/2009
On Screen Display – 2MP
The following On Screen Displays (OSD) are for the MON-STE19MC-2MP monitor:
(OSD functions for the MON-STE21MC-3MP and MON-STE21MC-5MP can be found on page 15)
OSD Adjustments
1. Power on the Monitor.
2. Press “Menu” button to start the OSD menu.
3. Press “+” or “-” button to select the menu items.
4. Press “Enter” button to enter the menu item.
5. Press “+” or “-” button to select sub-menu items.
6. Press “Enter” button to enter the sub-menu item.
7. Press“+” or “-” button to change the current setting of the function.
8. Exit the OSD menu or go back to the previous action by clicking the ”Menu” button. Changes will be
saved automatically.
Figure 5: OSD Display Menu
Display Menu
Mono Menu
OSD Control Buttons
Current Operation
Auto Brightness
Image Menu
Advanced Menu
Display Menu
OSD Menu
Setup Menu

Document # Revision Date
82070-275, Revision A 9 of 22 1/16/2009
On Screen Display Menu Function – 2MP
The following OSD Menu Functions are for the MON-STE19MC-2MP monitor:
(OSD Menu functions for the MON-STE21MC-3MP and MON-STE21MC-5MP can be found on page 15)
Auto Brightness
Auto light sensor setting.
Brightness
Adjust the brightness of the screen.
This function can only be shown when Auto Brightness is “Off.”
Contrast
Adjust the contrast of the image.
This function can only be shown when Auto Brightness is “Off.”
Auto Adjust
Automatically adjust image Clock, Phase, H-Position, V-Position settings
Auto Balance
Automatically adjust color of the image.
Phase
Adjust the focus of the image.
Clock
Adjust the clock pulse of the image.
H-Position
Move the image left and right on the screen.
V-Position
Move the image up and down on the screen.
Gamma
Adjust Gamma value.
Scaling
Adjust Image size.
Zoom Mode
Change the screen size according to the image aspect ratio.
Start Screen
On/Off start screen.
Auto Mode
On/Off Auto Adjust.
LED Mode
On/Off LED function.
Dis
p
la
y
Menu
Image Menu
This function can only be shown when Source is analog
Mono Menu
Advanced Menu

Document # Revision Date
82070-275, Revision A 10 of 22 1/16/2009
H-Position
Move the OSD left and right on the screen.
V-Position
Move the OSD up and down on the screen.
Rotation
Rotate the OSD.
Time Out
Adjust OSD display time setting.
Language
Choose language of the display on the screen.
All Reset
Recall all factory default settings.
Lock Mode
Lock the OSD function.
Overlapped
Set values when images overlap.
DVI Select
Select DVI source.
Information
Show Firmware, Source and Resolution.
Table 1: OSD Menu Function
OSD Menu
Setu
p
Menu

Document # Revision Date
82070-275, Revision A 11 of 22 1/16/2009
Structure of On Screen Display Menus – 2MP
The following Structure of OSD Menus are for the MON-STE19MC-2MP monitor:
How To Lock
1. Press “Menu” key to start OSD menu.
2. Select “Setup Menu” and press “Enter.”
3. Select “Lock Mode” and press “Enter.”
All Reset
Lock Mode
Overlapped
DVI Select
Information
Setup Menu
All Reset
Lock Mode
Overlapped
DVI Select
Information
Setup Menu

Document # Revision Date
82070-275, Revision A 12 of 22 1/16/2009
4. Selecting “Lock Mode” and pressing “Enter” will automatically save the settings.
Lock Mode
•Off: OSD Menu is not locked. Pressing “Menu” starts the OSD menu and all functions can be
adjusted.
•Mode 1: OSD Menu is locked and no functions can be adjusted.
•Mode 2: OSD Menu is locked except “Brightness.” Pressing “Menu” displays the “Brightness”
control menu.
•Default: Default value is “Off.”
5. Press “Menu” button and exit OSD:
•If setting is in “Off” mode, pressing “Menu” will show this image:
Setup Menu
Lock Mode
Dis
p
la
y
Menu
Auto Brightness
Off
Mode 1
Mode 2
Lock Mode
Setup Menu

Document # Revision Date
82070-275, Revision A 13 of 22 1/16/2009
•If setting is in “Mode 1,” pressing “Menu” will show this image:
•If setting is in “Mode 2,” pressing “Menu” will show this image:
How To Unlock
If setting is in “Mode 1” or “Mode 2” and you want to unlock, hold the “-” key (the button on back of the
monitor; see page 7, No. 6) until message on the screen displays “OSD unlocked.” Lock function is
then removed.
Notes:
•If Lock function is removed (unlocked) using the above methods, it will be locked again when OSD
function is not used for 15 minutes.
•Setting in “Off” mode removes lock function indefinitely and will not be locked automatically.
Auto Bri
g
htness
Off
300
400
500
600
OSD unlocked
OSD Locked

Document # Revision Date
82070-275, Revision A 14 of 22 1/16/2009
Quick Access Controls
The Quick Access Controls allow direct adjustment of settings by pressing either the “Source” or “Auto”
buttons on the user interface. (These settings are not accessed through the “Menu” button.)
1. Input Source Selection
Press “Source” to select the input source.
•DVI-D: Acquire digital signal from the DVI-I connector.
•VGA: Acquire analog signal from the D-sub connector.
•DVI-A: Acquire analog signal from the DVI-I connector.
2. Mode item Selection
Press “Auto” to select the display mode.
•User Mode: User identifies the standard display operation.
•DICOM Mode: System sets the DICOM standard operation.
•LB Mode: To imitate the operation for white light lamp box.
User Mode DICOM Mode LB Mode
DVI-D VGA DVI-A

Document # Revision Date
82070-275, Revision A 15 of 22 1/16/2009
On Screen Display Menu Function – 3MP & 5MP
The following OSD Menu Functions are for the MON-STE21MC-3MP and MON-STE20MC-5MP monitors:
Main Menu Sub Menu Description
Brightness Brightness Adjust the brightness of the screen
Contrast Contrast Adjust the contrast of the image
Gamma
Gamma Off:
Gamma 1.8:
Gamma 2.0:
Gamma 2.2:
Gamma DICOM:
Gamma User:
Gamma function OFF
Set the Gamma value to 1.8
Set the Gamma value to 2.0
Set the Gamma value to 2.2
Set the Gamma to standard value
Set the Gamma value for user
Light Sensor
Light OFF:
Light 300:
Light 400:
Light 500:
Light 600:
Light sensor OFF
Set the light sensor to 300
Set the light sensor to 400
Set the light sensor to 500
Set the light sensor to 600
Sys Info
HF:
VF:
Res:
Mdl:
Mver:
Fver:
SN:
Horizontal Scanning Frequency
Vertical Scanning Frequency
Display Resolution
The Model of MCU & FPGA
MCU Version
FPGA Version
Serial Number
OSD Rotate OSD Normal:
OSD Rotate:
The OSD is landscape
Rotate the OSD from landscape to portrait
MISC Reset Start: Restore to factory settings
Table 2: OSD Menu Function
Main Menu OSD Control
Button State

Document # Revision Date
82070-275, Revision A 16 of 22 1/16/2009
Quick Access Controls:
1. Source
Press “Source” to select the setting of Gamma.
2. Mode item Selection
Press “Auto” and the information will appear in the display.
Gamma Off Gamma 1.8 Gamma 2.0
Gamma User Gamma DICOM Gamma 2.2

Document # Revision Date
82070-275, Revision A 17 of 22 1/16/2009
Features
•DVI
The integrated interface ratified by the Digital Display Working Group (DDWG) that allows both digital
and analog connectors off of one port. The “I” stands for integration for both digital and analog. The
digital portion is DVI based.
•DFP (Digital Flat Panel)
An all-digital interface for flat panel monitors which is signal compatible with DVI. As a DVI-based digital
only connection, only a simple adapter is necessary for compatibility between DFP and other DVI-based
digital connectors such as DVI and P&D.
•P&D (Plug and Display)
The VESA standard for digital flat panel monitor interfaces. It is more robust than DFP since it allows for
other options off of a signal connector (options like USB, analog video and IEEE-1394-995). The VESA
committee has recognized that DFP is a subset of P&D. As a DVI-based connector (for the digital input
pins), only a simple adapter is necessary for compatibility between P&D and other DVI-based digital
connectors such as DVI and DFP.
•Pivoting Stand
Allows users to adjust the monitor to the orientation that best fits their application, either Landscape
orientation for wide documents, or Portrait orientation for the ability to preview a full page on one screen
at one time. The Portrait orientation also works well for full screen video conferencing.
•OSD (On-Screen Display) Controls
Allows you to quickly and easily adjust all elements of your screen image using simple OSD controls.
•Ergo Design Features
Enhances human ergonomics to improve the user’s work environment. Examples include OSD controls
for quick and easy image adjustments and tilt/swivel base for preferred viewing angle.
•Intelligent Power Management System
Provides innovative power-saving methods that allow the monitor to shift to a lower power consumption
level when on but not in use, saving electrical energy costs and reducing emissions.
•Multiple Frequency Technology
Automatically adjusts monitor to the display card’s scanning frequency; displaying the resolution
required.
•Full Screen Capability
Allows you to use the entire screen area in most resolutions, significantly expanding image size.
•Wide Viewing Angle Technology
Allows the user to be able to see the monitor from any angle from any orientation — Portrait or
Landscape. Provides the same viewing angles either up, down, left or right.
•Gamma
Internal circuitry automatically converts 8-bit data from the PC to 10-bit and back to 8-bit, producing a
smooth image. Gamma can be set by using preset values or creating a custom setting.

Document # Revision Date
82070-275, Revision A 18 of 22 1/16/2009
Monitor Care / Troubleshooting
Monitor Care
Always remove the plug from the AC outlet when
cleaning the monitor.
LCD Panel
Use a mild soap & water mixture with a soft
cleaning cloth. Do not use ammonia based
cleaning solutions. LCD cleaning wipes, available
where electronics are sold, can also be used.
Cabinet
The monitor cabinet (all but the screen) can be
cleaned with any alcohol based glass cleaner.
CAUTION!
Never use an organic solvent such as thinner,
benzine, alcohol or glass cleaner on the screen.
Storage
If the monitor will not be used for a long period of
time, be sure to remove the power plug from the
AC outlet (if accessible). Store in its original
carton if available. Store in a dry location in
temperatures between -4 and 140 degrees
Fahrenheit, as listed on the Specifications page of
this manual.
Troubleshooting
Please follow these troubleshooting tips prior to
contacting customer support.
The image is not displayed on the screen
- Is the power cord connected properly?
- Are the power cord and AC outlet functional?
- Are the computer and/or video source(s)
connected to the monitor properly?
- Are the computer and/or video source(s)
turned on?
- Is the Vacation switch on the back of the
monitor turned on?
- Has an input (video) signal been selected that
correlates to the video input(s) on the monitor?
- Is the monitor connected to a computer that is
in power-saving mode (check computer
manual for this feature)?
- Is the video cable functional?
OSD is not sized properly
- Use the OSD Image Adjust controls to
increase or decrease the total size.
Not tilting / rotating
- Refer to “Monitor Set-up and Connections”
section of this manual.
The image is glaring or dark
- Decrease/Increase the brightness of the
monitor by using the “Brightness” submenu.
- Decrease/Increase the “Black Level” of the
monitor by using the “Black Level” submenu.
- If using a camera as the video source, perform
a “White Balance” and check the “Iris Control”
on the camera (see camera’s operating
manual for instructions), if applicable.

Document # Revision Date
82070-275, Revision A 19 of 22 1/16/2009
Specifications
21 Mono 2-MP 21 Mono 3-MP 20 Mono 5-MP
VividImage®Model # MON-STE21M-2MP MON-STE21M-3MP MON-STE20M-5MP
INPUTS:
RGBHV (computer) ●●●
DVI ●●●
Resolution 1600 x 1200 2048 x 1536 2560 x 2048
Aspect Ratio 4:3 4:3 5:4
Brightness 1000 cd/m2 800 cd/m2 850 cd/m2
Contrast 700 to 1 700 to 1 600 to 1
Viewing Angle (horz &vert) 170 170 170
Stand Tilt / Swivel Tilt / Swivel Tilt / Swivel
Landscape and Portrait Mode ●●●
Dimensions (in / mm)
Width 18.89 / 480 18.89 / 480 18.66 / 474
Height 15.35 / 390 15.35 / 390 14.96 / 380
Depth 4.13 / 105 4.13 / 105 4.06 / 103
Weight (lb / kg) 15.4 / 7 15.4 / 7 16.3 / 7.4
Active Matrix LCD ●●●
Operating Temperature 32 to 104 Fahrenheit / 0 to 40 Celsius
Storage Temperature -4 to 140 Fahrenheit / -20 to 60 Celsius
Voltage: Monitor Input 100-240V AC 100-240V AC 100-240V AC
Mounting Hole Pattern (VESA) 75 & 100mm 75 & 100mm 75 & 100mm
Power Requirements 75 Watts max 75 Watts max 100 Watts max
Certifications
CE Marking (EN 60601-1-2), China CCIB/CCEE Approval, CISPR
Requirements, Eastern European Approvals (EN 600601-1-1), Energy
Star Compliant, FCC Approval, ISO 13406-2 Compliant (Pixel Defect
Guidelines), MPR-II Compliant, PC2001 Compliant, Taiwan BSMI
Approval, UL Medical Standard Listed, UL 60601, VCCI Approvals
Table 3: Specifications

Document # Revision Date
82070-275, Revision A 20 of 22 1/16/2009
Glossary
Black Level: This adjustment allows the display to be set to discriminate between small differences in dark
or near black areas of the image. The adjustment should make a black area of the image (such as a deep
shadow where all detail is lost in the image) appear black. The black level is decreased (less black) until a
change toward light or grey is perceived in this area, then the adjustment should be increased slightly to
restore the dark area to black. It is important to perform this adjustment on a truly black area in the image to
avoid making dark areas appear lighter than they actually are.
Brightness: The intensity of light emitted from the LCD Display. This control is similar to the effect of
changing the light behind a stained glass window. As the illumination is increased the overall light output of
the image is increased. The proper adjustment takes into consideration the ambient light in the room. For a
brightly lit room, the brightness of the display may be increased to improve the visibility of the image. In a
dimly lit room, the brightness may be decreased to reduce the impact on the eye.
Clock: This adjustment is seldom necessary, but if there is a problem with the frequency of the monitor
pixel clock that it cannot exactly match the clock signal from the camera, an adjustment may be required.
The symptom of a clock adjustment problem is the appearance of vertical bands in the image. Adjustment
of the clock will help eliminate these artifacts.
Contrast: Contrast is a function of differences in intensity between the darkest and the brightest areas of a
picture. When contrast is high the picture contains sharp blacks and whites. When low, the picture shows
only variations in gray tones.
Gamma: The way brightness is distributed across the intensity spectrum by a monitor, printer or scanner.
Depending on the device, the gamma may have a significant effect on the way colors are perceived.
Gamma is technically the relationship between the input voltage and resulting intensity of the output. A
perfect linear device would have a gamma of 1.0 and be plotted on a graph called a "tone curve" as a
straight line. Although a scanner is fairly linear, the tone curve of a monitor or printer is bent, yielding a
gamma in the range of 1.8 to 2.6, which affects midrange tones.
Phase: This adjustment is seldom necessary, but if there is a problem with the monitor pixel clock phase or
position in relation to the pixel clock generated by the camera, a phase adjustment may be required. The
symptom of phase problems is the appearance of horizontal lines flickering through the image.