Sony SRG120DH, Technical Manual

Page 1: ... 2013 Sony Corporation HD Color Video Camera SRG 120DH A ES7 100 11 1 Technical Manual ...

Page 2: ...figuration 5 Locations of Controls 7 Basic Functions 10 Overview of Functions 10 Initial Settings and Preset 16 Mode Condition 17 Command List 22 VISCA RS 232 Commands 22 IP Related Setting Command 32 SRG 120DH Commands 34 Specifications 50 Precautions 54 ...

Page 3: ...f VISCA camera protocol in external communication You can use the camera in multi purpose usages with the pan tilt functions of high speed and high noise reduction You can use the infrared remote commander to set the camera and also to select panning tilting and zooming from the setting menu You can store up to 16 kinds of camera direction and camera status into the camera In the case of the infra...

Page 4: ...RS 232 you can operate the camera with the computer To obtain a cable consult the dealer where you bought your camera 2 For details on the LAN connection using LAN cable see page 28 to 12V Power cord supplied HDMI cable not supplied to HDMI VIDEO to HDMI input VISCA cable not supplied 1 to VISCA RS 232 IN to RS 232 to VISCA RS 232 OUT To VISCA IN of other SRG series when connecting to more than on...

Page 5: ...typical system examples with the required components and the main usage of each system Operating a SRG 120DH Using the Supplied Infrared Remote Commander This system allows you To operate the camera readily from a short distance System configuration SRG 120DH Infrared Remote Commander supplied HD video monitor Video signal Signal flow ...

Page 6: ...oller Signal flow Operating Multiple SRG 120DH Using Multiple RM IP10 IP Remote Controllers System configuration You can operate up to 112 cameras using five IP remote controllers The joystick of the IP remote controller allows comfortable pan tilt and zoom operations System configuration SRG 120DH HD video monitor Video signal Remote control LAN signal RM IP10 IP Remote Controller Signal flow SRG...

Page 7: ... image after the lamp lights STANDBY lamp Lights in amber when the power is turned off using the infrared remote commander Rear SYSTEM SELECT switch Used for setting the video format of the signal to be output from the HDMI VIDEO connectors For details see Setting of the SYSTEM SELECT switch page 8 HDMI video connector Supplies the images as a HDMI video signal or DVI video signal IR SELECT switch...

Page 8: ...nnection 12 V connector Connect the supplied AC power adaptor Reset switch The reset switch is enabled only when the BOTTOM switch is set to the LAN connection When you press down this switch with a pointed tip for about five seconds the camera will reboot and only the setting relating to the IP will return to the factory setting Factory settings for IP IP address 192 168 0 100 Subnet mask 255 255...

Page 9: ...n is set to 6 EDID the most suitable format will be output automatically based on the resolution of the Video monitor to be connected If the switch position is set to 7 VISCA CONTROL you can configure the video format via external communication Setting of the BOTTOM switches To change the BOTTOM switch setting select the BOTTOM switch with the power of this unit turned off not including standby st...

Page 10: ...lly adjusts the focus position to maximise the high frequency content of the picture in a center measurement area taking into consideration the high luminance and strong contrast components The minimum focus distance is 10 mm at the optical wide end and 1500 mm at the optical tele end Normal AF Mode This is the normal mode for AF operations Interval AF Mode The mode used for AF movements carried o...

Page 11: ...ot the subject that you want to capture the white color and send the One Push White Balance Trigger The One Push White Balance data is lost when the power is turned off If the power is turned off set One Push White Balance again Manual WB Manual control of R and B gain 256 steps each Automatic Exposure Mode A variety of AE functions are available for optimal output of subjects in lighting conditio...

Page 12: ...0F 1 1000 1 1000 0E 1 725 1 600 0D 1 500 1 425 0C 1 350 1 300 0B 1 250 1 215 0A 1 180 1 150 09 1 125 1 120 08 1 100 1 100 07 1 90 1 75 06 1 60 1 50 05 1 30 1 25 04 1 15 1 12 03 1 8 1 6 02 1 4 1 3 01 1 2 1 2 00 1 1 1 1 AE Iris priority The iris can be set freely by the user to 14 steps between F1 8 and Close The gain and shutter speed are set automatically according to the brightness of the subject...

Page 13: ... correcting blocked up shadows and blown out highlights in accordance with the intensity difference It enables you to obtain images in which portions ranging from dark to light can be recognized even when capturing a subject with a large intensity difference that is backlit or includes extremely light portions Images with wide dynamic range are produced by combining long exposure signals normal sh...

Page 14: ... be saved Picture Effect It consists of the following functions Neg Art Negative Positive Reversal Black White Monochrome Image Check for influence of installation environment on infrared remote commander operation The supplied infrared remote commander may not operate only occasionally in the vicinity of the inverter lighting device In this case it is possible that the camera is installed in a pl...

Page 15: ... desired status instantly even without adjusting the following items each time Pan Tilt Position Zoom Position Digital Zoom On Off Focus Auto Manual Focus Position AE Mode Shutter control parameters Bright Control Iris control parameters Gain control parameters Exposure Compensation On Off Exposure Level Backlight Compensation On Off Auto Slow Shutter On Off White Balance Mode R B Gain Aperture Co...

Page 16: ...F Sensitivity Normal AF Mode Normal AF Run Time 5 sec AF Interval 5 sec WB Mode Auto WB Data Rgain Bgain One Push WB Data AE Mode Full Auto WD Mode Off Auto Slow Shutter Mode Off Shutter Position Iris Position Gain Position Bright Position Exposure Compensation On Off Off Exposure Compensation Amount 0 BackLight On Off Off Aperture Level 0Ah High Resolution Mode On Off Off Picture Effect Off High ...

Page 17: ...o Yes 1 DC power is being supplied but the camera has been turned off by a VISCA command 2 The period from the time IF Clear is sent until the Reply Packet is returned 3 The period from the time DC power is turned on or the camera is turned on via a VISCA command and the camera subsequently finishes the pan tilt reset operation and stops at the Home position until the video signal is output Or the...

Page 18: ...ned 3 The period from the time DC power is turned on or the camera is turned on via a VISCA command and the camera subsequently finishes the pan tilt reset operation and stops at the Home position until the video signal is output Or the period from the time the CAM Power ON command is sent until Completion is returned 4 When the menu display is updating operation is not possible White Balance Mode...

Page 19: ... Reset Up Down Direct 6 No No No Yes Yes Yes Yes Yes Yes Yes 5 No CAM_Backlight On Off No No No Yes Yes No No No No Yes 5 No CAM_WIDE D Off Low Mid High No No No Yes Yes No No No No Yes 5 7 No CAM_Defog No No No Yes Yes No No No No Yes 7 No 1 DC power is being supplied but the camera has been turned off by a VISCA command 2 The period from the time IF Clear is sent until the Reply Packet is return...

Page 20: ...o Yes 4 No CAM_ColorHue No No No Yes 4 No 1 DC power is being supplied but the camera has been turned off by a VISCA command 2 The period from the time IF Clear is sent until the Reply Packet is returned 3 The period from the time DC power is turned on or the camera is turned on via a VISCA command and the camera subsequently finishes the pan tilt reset operation and stops at the Home position unt...

Page 21: ...o No No No No No No No No No Yes 5 Yes Infrare Remote Commander No No No Yes Yes No No No No No No No No No No Yes 5 Yes Pan tiltLimitSet LimitSet VISCA No No No Yes Yes Yes Yes No No No No No No No No Yes 5 No Pan tiltLimitSet LimitClear VISCA No No No Yes Yes Yes Yes No No No No No No No No Yes 5 No Memory Set Common No No No No No No No No No No No No No No No No No Memory Reset Common No No No...

Page 22: ...ted Peripheral devices are connected in a daisy chain As shown in Fig 1 the actual internal connection is a one direction ring so that messages return to the controller via the peripheral devices The device address is assigned to each device on the network The address of the controller is fixed at 0 Each VISCA equipment has VISCA IN and VISCA OUT connectors Set the DTR input the S output of the co...

Page 23: ...dress 2 is A0h Some of the setting commands for SRG can be sent to all devices at one time broadcast In the case of broadcast the header should be 88h in hexadecimal When the terminator is FFh it signifies the end of the packet The broadcast function is not available for VISCA over IP Bit 7 MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 LSB 1 0 FF Bit 7 MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0...

Page 24: ...setting command Completion message A message returned by this unit when the execution of command or inquiry is completed In the case of inquiry commands reply data for the inquiry is contained after the 3rd byte of the packet If the Acknowledge message is omitted the socket number will contain 0 Reply Packet Note Acknowledge X0 4Y FF Y socket number Completion Commands X0 5Y FF Y socket number Com...

Page 25: ... X 1 for VISCA over IP Error message Command canceled will be returned for this command but this is not a fault It indicates that the command has been canceled VISCA Device Setting Command Before starting control of this unit be sure to send the Address command and the IF_Clear command using the broadcast function For VISCA network administration Address Sets an address of a peripheral device Use ...

Page 26: ...a command lacking parameters 81 01 04 38 02 FF Example 90 60 03 FF Command Buffer Full Could not accept the command as there are two commands currently being executed 81 01 04 08 02 FF Example 90 61 41 FF Command Not Executable 90 62 41 FF Could not execute the command in the current mode Inquiry Command 81 09 04 38 FF Example 90 50 02 FF Completion Does not return Acknowledge 81 09 05 38 FF Examp...

Page 27: ...sockets have been used Command Canceled z0 6y 04 FF y Socket No Returned when a command which is being executed in a socket specified by the cancel command is canceled The completion message for the command is not returned No Socket z0 6y 05 FF y Socket No Returned when no command is executed in a socket specified by the cancel command or when an invalid socket number is specified Command Not Exec...

Page 28: ...connection the controllers and peripheral devices are connected by star type through a LAN For the connection using RS 232 see Fig 1 on page 22 VISCA Equipment VISCA Controller VISCA Controller VISCA Equipment VISCA Equipment LAN L2 switch etc IP communication connection While the IP communication connection the address of each device cannot be set in the VISCA message as it is because the control...

Page 29: ... to the controller is common VISCA device setting command This is the device setting command from the controller to the peripheral device When the peripheral device receives this classifications command the peripheral device performs the function depend on the command Address Sets the address of the peripheral device and does not return a reply to the controller While using VISCA over IP the addre...

Page 30: ... Stores the reply for the command or inquiry Acknowledge message completion message or error message VISCA device setting command Stores the packet of the VISCA device setting command Control command The following are stored on the payload division of the control command Name Value Description RESET 01h Resets the sequence number to 0 The value that was set as the sequence number is ignored ERROR ...

Page 31: ...bnormality in the sequence number Inquiry has been performed If the result by the reply message is needed retransmit by updating the sequence number Error message Error message Command is not performed If the error cause eliminates normal reply is returned Acknowledge reply message Eliminate the error cause If normal reply returns continue processing Inquiry of the VISCA device setting command Rep...

Page 32: ...Setting Protocol Inquiry reply The camera replies according to the inquiry from the controller 3 Setting Protocol Network setting The controller sets the network setting of the camera 4 Setting Protocol Network setting reply The camera replies according to the network setting of the controller The network setting of the IP card is performed as communication sequence in the following 1 Inquiry The ...

Page 33: ...ting UDP Broadcast address 255 255 255 255 Specified port number 52380 02 MAC 1 FF IPADR 1 FF MASK 1 FF NAME xxxxxxxx 1 FF 03 Network setting reply UDP Broadcast address 255 255 255 255 Specified port number 52380 02 ACK 2 xxxx 3 FF 03 1 Uses the ASCII code 2 Uses the ASCII code When the network setting has failed returns as NAK 3 Uses the ASCII code Returns by adding the detail message if necessa...

Page 34: ... AF Trigger Infinity 8x 01 04 18 02 FF Forced infinity Near Limit 8x 01 04 28 0p 0q 0r 0s FF pqrs Focus Near Limit Position AF Sensitivity Normal 8x 01 04 58 02 FF AF Sensitivity High Low Low 8x 01 04 58 03 FF CAM_AFMode Normal AF 8x 01 04 57 00 FF AF Movement Mode Interval AF 8x 01 04 57 01 FF Zoom Trigger AF 8x 01 04 57 02 FF Active Interval Time 8x 01 04 27 0p 0q 0r 0s FF pq Movement Time rs In...

Page 35: ...p 8x 01 04 0D 02 FF Down 8x 01 04 0D 03 FF Direct 8x 01 04 4D 00 00 0p 0q FF pq Bright Position CAM_ExpComp On 8x 01 04 3E 02 FF Exposure Compensation ON OFF Off 8x 01 04 3E 03 FF Reset 8x 01 04 0E 00 FF Exposure Comp Amount Setting Up 8x 01 04 0E 02 FF Down 8x 01 04 0E 03 FF Direct 8x 01 04 4E 00 00 0p 0q FF pq ExpComp Position CAM_BackLight On 8x 01 04 33 02 FF Back Light Comp ON OFF Off 8x 01 0...

Page 36: ...en 5 cyan 6 blue The range of q is from 0 to E The initial value is 7 Phase direction with 8 or more Phase direction with 6 or less SYS_Menu Off 8x 01 06 06 03 FF Erasing menu display Video Format Change4 SYSTEM SELECT SWITCH 7 only VISCA Control enabled 8x 01 7E 01 1E 0p 0q FF pq 0 1920 1080p 59 94 2 1920 1080p 29 97 3 1920 1080i 59 94 4 1280 720p 59 94 5 1280 720p 29 97 8 1920 1080p 50 A 1920 10...

Page 37: ...0Y 0Y 0Y 0Z 0Z 0Z 0Z FF Home 8x 01 06 04 FF Reset 8x 01 06 05 FF Pan tiltLimitSet LimitSet 8x 01 06 07 00 0W 0Y 0Y 0Y 0Y 0Z 0Z 0Z 0Z FF W 1 UpRight YYYY Pan Limit Position EC01 to 1400 ZZZZ Tilt Limit Position FB01 to 0500 W 0 DownLeft YYYY Pan Limit Position EC00 to 13FF ZZZZ Tilt Limit Position FB00 to 04FF LimitClear 8x 01 06 07 01 0W 07 0F 0F 0F 07 0F 0F 0F FF 1 After the ACK for One Push WB T...

Page 38: ...0p 0q FF pq R Gain CAM_BGainInq 8x 09 04 44 FF y0 50 00 00 0p 0q FF pq B Gain CAM_AEModeInq 8x 09 04 39 FF y0 50 00 FF Full Auto y0 50 03 FF Manual y0 50 0A FF Shutter Priority y0 50 0B FF Iris Priority y0 50 0D FF Bright CAM_SlowShutterModeInq 8x 09 04 5A FF y0 50 02 FF Auto y0 50 03 FF Manual CAM_ShutterPosInq 8x 09 04 4A FF y0 50 00 00 0p 0q FF pq Shutter Position CAM_IrisPosInq 8x 09 04 4B FF ...

Page 39: ...50 02 FF 1920 1080p 29 97 y0 50 03 FF 1920 1080i 59 94 y0 50 04 FF 1280 720p 59 94 y0 50 05 FF 1280 720p 29 97 y0 50 08 FF 1920 1080p 50 y0 50 0A FF 1920 1080p 25 y0 50 0B FF 1920 1080i 50 y0 50 0C FF 1280 720p 50 y0 50 0D FF 1280 720p 25 Color SystemInq 8x 09 7E 01 03 FF y0 50 00 FF HDMI YUV y0 50 01 FF HDMI GBR y0 50 02 FF DVI GBR y0 50 03 FF DVI YUV IR_Receive 8x 09 06 08 FF y0 50 02 FF ON y0 5...

Page 40: ...2 0 1 0 0 0 13 7 0 6 0 5 0 4 AF Mode 0 Normal 1 Interval 2 Zoom Trigger 3 2 AF Sensitivity 1 Normal 0 Low 1 Digital Zoom 1 On 0 Off 0 Focus Mode 1 Auto 0 Manual 14 7 0 6 0 5 0 4 0 3 Low Contrast Detection 1 Yes 0 No 2 Camera Memory Recall 1 Executing 0 Stopped 1 Focus Command 1 Executing 0 Stopped 0 Zoom Command 1 Executing 0 Stopped 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comme...

Page 41: ...Position 3 2 1 0 14 7 0 6 0 5 0 4 0 3 Exposure Comp Position 2 1 0 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comments 6 7 0 6 0 5 0 4 0 3 WB Mode 2 1 0 7 7 0 6 0 5 0 4 0 3 Aperture Gain 2 1 0 8 7 0 6 0 5 0 4 Exposure Mode 3 2 1 0 9 7 0 6 0 5 HighResolution 1 On 0 Off 4 WideD 1 Other than Off 0 Off 3 0 2 Back Light 1 On 0 Off 1 Exposure Comp 1 On 0 Off 0 Slow Shutter 1 Auto 0 Manua...

Page 42: ...e Bit Comments 12 7 0 6 0 5 0 4 1 3 0 2 1 1 1 0 System 1 1 50 1 25 0 1 59 94 1 29 97 13 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 14 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comments 6 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 7 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 8 7 0 6 0 5 0 4 0 3 Camera ID HH 2 1 0 9 7 0 6 0 5 0 4 0 3 Camera ID HL 2 1 0 10 7 0 6 0 5 0 4 0 3 Camera ID ...

Page 43: ...omments 12 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 1 13 7 0 6 Gamma 5 4 3 High Sensitivity mode 1 ON 0 OFF 2 NR Level 1 0 14 7 0 6 Chroma Suppress 5 4 3 Gain Limit 2 1 0 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comments 6 7 0 6 0 5 0 4 0 3 AF Interval Time H 2 1 0 7 7 0 6 0 5 0 4 0 3 AF Interval Time L 2 1 0 8 7 0 6 0 5 0 4 0 3 1 2 0 1 0 0 0 9 7 0 6 0 5 0 4 0 3 1 2 0 1 0 0 0 10 7 0 6 0 5 0...

Page 44: ...eserved Byte Bit Comments 12 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 13 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 14 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comments 6 7 0 6 0 5 0 4 0 3 0 2 0 1 Reserved 0 Reserved 7 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 defog mode 0 Off 1 On 8 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 9 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 10 7 0 6 0 5 0 4 0 3 0 2 0 1 0 ...

Page 45: ...eserved 5 4 3 2 1 0 Byte Bit Comments 12 7 0 6 Reserved 5 4 3 2 1 0 13 7 0 6 Reserved 5 4 3 2 1 0 14 7 0 6 Reserved 5 4 3 2 1 0 15 7 1 Terminator FFh 6 1 5 1 4 1 3 1 2 1 1 1 0 1 Byte Bit Comments 6 7 0 6 Reserved 5 4 3 2 1 0 7 7 0 6 Reserved 5 4 3 2 1 0 8 7 0 6 Reserved 5 4 3 2 1 0 9 7 0 6 Reserved 5 4 3 2 1 0 10 7 0 6 Reserved 5 4 3 2 1 0 11 7 0 6 Reserved 5 4 3 2 1 0 Enlargement Function3 Query ...

Page 46: ...1 215 0A 1 180 1 150 09 1 125 1 120 08 1 100 1 100 07 1 90 1 75 06 1 60 1 50 05 1 30 1 25 04 1 15 1 12 03 1 8 1 6 02 1 4 1 3 01 1 2 1 2 00 1 1 1 1 Iris 11 F1 8 10 F2 0 0F F2 4 0E F2 8 0D F3 4 0C F4 0B F4 8 0A F5 6 09 F6 8 08 F8 07 F9 6 06 F11 05 F14 00 CLOSE Gain 0F 43dB 0E 39dB 0D 36dB 0C 33dB 0B 30dB 0A 27dB 09 24dB 08 21dB 07 18dB 06 15dB 05 12dB 04 9dB 03 6dB 02 3dB 01 0dB Gain Limit 0F 43dB 0...

Page 47: ... 0dB 0A F5 6 0dB 09 F6 8 0dB 08 F8 0dB 07 F9 6 0dB 06 F11 0dB 05 F14 0dB 00 CLOSE 0dB Display Compensation Amount Exposure Comp 0E 7 10 5dB 0D 6 9dB 0C 5 7 5dB 0B 4 6dB 0A 3 4 5dB 09 2 3dB 08 1 1 5dB 07 0 0dB 06 1 1 5dB 05 2 3dB 04 3 4 5dB 03 4 6dB 02 5 7 5dB 01 6 9dB 00 7 10 5dB Optical Zoom Ratio and Zoom Position for reference Zoom Position 0000 Wide end to 4000 Tele end Optical Zoom Ratio Opti...

Page 48: ...6h 185 17h 251 18h1 302 1 Max pan speed is 18h max tilt speed is 17h Digital Zoom Digital Zoom Ratio Digital Zoom Position Data 1 4000 2 6000 3 6A80 4 7000 5 7300 6 7540 7 76C0 8 7800 9 78C0 10 7980 11 7A00 12 7AC0 Focus NEAR limit and focus distance Focus position 1000 Far end to E000 Near end NEAR Limit Focus Distance 1000 Over Inf 2000 10m 3000 5m 4000 3 3m 5000 2 5m 6000 2m 7000 1 7m 8000 1 5m...

Page 49: ... 0 Initialization completed 11 0 Initialization failed optional Pan Tilt Position for reference Parameter position PAN EC00 100 degree to 1400 100 degree TILT FB00 25 degree to 0500 25 degree LED Status Status POWER Green STANDBY Orange Main power ON Power On including initializing period On Off When receiving infrared signals form Infrared Remote Commander Blinking Off At position detection error...

Page 50: ... 50 IRE high sensitivity mode ON 60fps Shutter speed 1 1 to 1 10000 sec 22 steps Video S N 50 dB Pan tilt action Horizontal 100 degrees Maximum panning speed 300 degrees sec Vertical 25 degrees Maximum tilting speed 126 degrees sec Input output connectors HDMI video Type A 19 pin Control input output VISCA IN Mini DIN 8 pin type RS 232 VISCA OUT Mini DIN 8 pin type RS 232 LAN connector RJ 45 8 pin...

Page 51: ...nder 1 For safety 1 Operating Instructions CD ROM 1 Design and specifications are subject to change without notice The terms HDMI and HDMI High Definition Multimedia Interface and the HDMI Logo are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries ...

Page 52: ...76 5 3 1 64 156 6 9 64 2 5 2 5 60 2 23 64 60 2 23 64 66 2 19 32 50 1 31 32 40 1 37 64 33 1 19 64 63 2 31 64 17 43 64 40 1 37 64 29 5 1 5 32 24 19 32 14 35 64 64 2 33 64 64 2 33 64 M3 M3 M3 Leg 4 Ø8 A Ø5 depth 5 1 4 20UNC depth 7 Tripod screw hole Top Front Bottom Rear Side Unit mm inches ...

Page 53: ...and the following disclaimer 2 Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and or other materials provided with the distribution 3 The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission THIS SOFTWARE IS PROVIDED B...

Page 54: ...r store the camera in the following extreme conditions Extremely hot or cold places operating temperature 0 C to 40 C 32 F to 104 F Close to generators of powerful electromagnetic radiation such as radio or TV transmitters Where it is subject to fluorescent light reflections Where it is subject to unstable flickering etc lighting conditions Where it is subject to strong vibration Care of the unit ...