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Step 6: Motion alarm record channel setup: 

When there is motion 

alarm happened, you can trigger related camera to start recording. In 
“Motion Alarm Handle” menu, you can select one or more record 
channels. Please use [ENTER] or [EDIT] key to enable the flag into 

“

9

”. 

 

Note: In order to make the cameras start recording, in “Recording” 
menu, you must enable recording schedule and set “Rec Type” as 
“Motion Detection” or “Motion | Alarm”. Please refer to chapter 5.12 for 
recording setup.

 

 
Step 7: Motion alarm schedule: 

When the motion alarm is 

happened in schedule, DVR will response such as “On Screen 
Warning”, “Audible Warning”, “Upload to Center” and “Trigger Alarm 
Output”. You can setup 4 time periods for one day and 7 days for one 
week.  

 

Note: Time periods in one day can not be repeated.

  

 

Содержание QT-500 Series

Страница 1: ...l Rev 20 12 2006 This manual is applicable for QT 500 4 QT 500 8 and QT 500 16 embedded DVRs Read this User Manual carefully to ensure that you can use the device correctly and safely The contents of...

Страница 2: ...4 2 Preview 22 4 3 User name and password 25 4 4 PTZ Control 27 4 5 Manual Record 30 4 6 Playback 31 4 7 Backup Recorded Files 36 4 8 Shut Down DVR 39 Chapter 5 Parameters Setup Guide 41 5 1 Administr...

Страница 3: ...8 View Log 105 6 9 System Information 109 Chapter 7 Firmware Upgrade 110 7 1 FTP Server Setup 110 7 2 Upgrade Mode 114 Appendix A 116 Appendix B 116 Appendix B 117 DVR Connect Cable Definition 117 1 U...

Страница 4: ...eo recorder DVR and digital video server DVS It can work stand alone also be used to build a powerful surveillance network widely used in bank telecommunication transportation factories warehouse irri...

Страница 5: ...t max 4 IDE HDDs and each HDD can max support 2000GB z Support FAT32 file system z Support HDD S M A R T technology z Support cycle or none cycle record z Support backup the recorded files and clips S...

Страница 6: ...row band dialup z Support remote parameters setup z Alarm information can be sent to remote center z Network control PTZ z Network record live stream z Network download and playback the recorded files...

Страница 7: ...on 1 Open the DVR box 2 If you want to install 2 HDD for one IDE interface please set master and slave HDD set the jumpers properly in the HD If you want to install 4 HDD please remove CD R W mount br...

Страница 8: ...t u QT 500 4 Rear Panel Index Physical Interface Description 1 Video Input Standard BNC Video Output Connect monitor output video and menu 2 Audio Output 1 channel RCA 1 0 Vp p 75 3 Audio input 4 cha...

Страница 9: ...External Alarm Input 4 8 16 Alarm in 7 Relay Output 2 4 Alarm out 8 AC Input 100V 240VAC 2 4 External Alarm In Out Connection Alarm input port G GND Connect the GND of sensor 1 16 Alarm input support...

Страница 10: ...AC please open the jumper There are 4 jumpers JJ1 JJ2 JJ3 and JJ4 in DVR main board corresponding with 4 alarm output The default is closed Warning If you use AC input for relay output please open th...

Страница 11: ...eans there is alarm Twinkle in red means reading or writing HDD Network status 2 Lamp IR receiver Numeric Keys Input number lower case upper case character and symbols 3 Function Keys MENU 2 3 ESC 1 S...

Страница 12: ...r case upper case and symbol 2 FOCUS in PTZ control 3 In preview mode display or hide the channel status bar Switch between numeric keys and function keys 4 Control Keys Direction Keys ENTER Composed...

Страница 13: ...troller Inde x Name Description 1 POWER Turnoff device 2 DEV Enable Disable IR remote control 3 Numeric Keys Same as numeric keys of front panel 4 EDIT Same as EDIT key of front panel 5 A Same as A ke...

Страница 14: ...panel 13 PTZ Same PTZ key of front panel 14 ESC Same as ESC key of front panel 15 Reserved 16 F1 Same as F1 key of front panel 17 Lens control IRIS FOCUS ZOOM for lens control 18 F2 Same as F2 key of...

Страница 15: ...l be turned off The IR Remote Controller can not control this DVR Switch the DVR off When IR Remote Controller status is on press POWER key for several seconds the DVR will be powered off If the IR Re...

Страница 16: ...tion and OSD format setup Mask area setup View tampering area and response setup Video signal loss Motion detection sensitivity area and response setup Recording Overwrite Stop recording Resolution an...

Страница 17: ...e ATM IP address ATM type Text information Utilities Restore parameters Upgrade firmware HDD management Clear alarm output Reboot Power off View log System information 3 3 2 Menu Operation How to ente...

Страница 18: ...frame named Active Frame It can be moved from one icon to another by using or key When the Active Frame is located on one icon you can press ENTER key to enter into the secondary menu For example move...

Страница 19: ...ple on the right side of Select Camera there is a list box for you to select one camera 3 Edit Box This is for you to input characters Press EDIT key to enter into edit status you can input characters...

Страница 20: ...o edit status for example in the camera name edit box at the bottom of screen the input status is appeared Here it means you can press numeric keys to input digital number Press A key to change input...

Страница 21: ...t DVR When DVR is started POWER lamp is in green On the monitor or VGA display DSP and HDD initialization process will be shown The first line represents DSP initialization If the DSP icon is it means...

Страница 22: ...us icon Set system date and time in Display menu referring to 5 2 9 Change camera name in Image menu referring to 5 3 2 In the screen it will display record and alarm status of each camera These two k...

Страница 23: ...on Color Status Description White No video signal Yellow Video input Pink Manual recording Green Real time recording Blue Motion detect recording Red External alarm recording Camera alarm status is fo...

Страница 24: ...10 channels press one numeric key to switch corresponding channel For example press 2 key to preview 2nd camera If DVR has 10 or more than 10 channels press two numeric keys to switch corresponding c...

Страница 25: ...y to enter into Password edit box input corresponding password press ENTER key to exit edit box The Active Frame will be moved to Confirm button Press ENTER key to enter into main menu If there is bee...

Страница 26: ...Step 2 Enter into password modification menu Move the Active Frame to Password icon by using keys Press ENTER key to enter into following password menu...

Страница 27: ...r Step 4 Modify password successfully Move the Active Frame to Confirm button press ENTER key If the password is modified successfully you will get the main menu Or an error dialog will be pop up You...

Страница 28: ...hannels press one numeric key to select For example press 2 key to select 2nd camera PTZ If DVR has 10 or more than 10 channels you must press two numeric keys to select For example press 0 2 to selec...

Страница 29: ...t PTZ control mode the camera will stay at the current position Note The PTZ preset number is set already Please refer to PTZ menu for preset setup V1 4 firmware can support 128 preset numbers at most...

Страница 30: ...can enter into the Manual Record interface In menu mode press REC key to enter into Manual Record interface directly Description Manual record interface has following parts channel number channel stat...

Страница 31: ...op all channel recording Exit manual record Press ESC key to enter into preview mode Press MENU key to enter into main menu Press PLAY key to enter into playback menu Press PTZ key to enter into PTZ c...

Страница 32: ...ion You can define the search time section Move Active Frame to the time edit box use numeric keys to input the detail time Card Number DVR can get text number through RS 232 or network port The text...

Страница 33: ...e numeric keys or or keys to select page File List Box List the matched files File started time file size are displayed in the list box You can use or keys to move the scroll bar to select file Backup...

Страница 34: ...nnel number record type and time section move Active Frame to Play button press ENTER key DVR will start to playback based on time section 3 Search by Card No and Playback file In the playback interfa...

Страница 35: ...r MENU z Open Close sound PLAY z Adjust play progress Backward Forward The unit is z Adjust play speed Normal speed is 1x Use to increase play speed 2X 4X 8X and MAX Use to decrease play speed 1 2X 1...

Страница 36: ...ed files In the preview mode press PLAY key in the login dialog select username and input the correct password you can enter into the playback interface In the menu mode just press PLAY key you can en...

Страница 37: ...ton press ENTER key DVR will start to find and list the matched files Step 2 Select the files that you want to backup In the file list box use or keys to move the scroll bar When the scroll bar stays...

Страница 38: ...s EDIT again to stop selecting This segment is selected 3 You can repeat step 2 to select many segments 30 segments can be selected in all 4 After you select all segments press ESC key a message windo...

Страница 39: ...e Controller Press POWER key for above 3 seconds In preview mode a login dialog will pop up select user name and input password press Enter to enter into power off dialog and press Confirm to shut dow...

Страница 40: ...mally Use the power switch of real panel When DVR is run if you switch off the power the HDD in DVR will be damaged Please avoid such operation Take away the power cable Please avoid taking away the p...

Страница 41: ...ampering alarm schedule z Video lost alarm schedule z Motion detection alarm schedule z External alarm schedule z Alarm output schedule z Transaction z RS232 work mode z Change video output standard 5...

Страница 42: ...box only admin is existed You can use key move Active Frame to password edit box and press EDIT key to enter into edit status Press numeric keys to input the new password The password is only combined...

Страница 43: ...tton and press ENTER if password and verify password are the same the password will be saved and taken into effective If password and verify password are not same a warning message box will be appeare...

Страница 44: ...Enter into User Management menu Please refer to chapter 5 1 Step 2 Add new user name In the User Management menu move Active Frame to Add button and press ENTER in the pop up dialog input the new use...

Страница 45: ...to input the new password Step 3 Setup the rights for new user The new added user has not any operational rights You must setup rights for him In the users list box of User Management menu use keys t...

Страница 46: ...eturn User Management menu If you press Cancel button the user s rights will be aborted Step 4 Save the new user s password and rights In the User Management menu press Confirm button the user s passw...

Страница 47: ...mat HDD reboot DVR and shut down DVR etc Voice Client talks with DVR Preview Network live preview Alarm Remote control DVR alarm output Local Video Out Remote control DVR video output Com Control DVR...

Страница 48: ...annel for users Delete user In User Management interface you can use keys to select one user then use move Active Frame to Del button press ENTER in the pop up confirmation dialog press Confirm button...

Страница 49: ...ress ENTER key to finish modification Select Confirm button and press ENTER you can save the new unit name and make it into effect Press Cancel button or ESC key to abort modification Device ID When y...

Страница 50: ...e and take effect or press Cancel to abort modification 5 4 Video Output Standard and VGA Setup Video output standard There is one VOUT BNC connector at the rear panel of DVR It is used to connect wit...

Страница 51: ...00 600 60Hz and 800 600 75Hz You can use key to select Press Confirm button to save or Cancel to abort 5 5 OSD Setup OSD is abbreviation of On Screen Display For our embedded DVRDVS it includes displa...

Страница 52: ...rent Flashing Opaque Flashing Move Active Frame to OSD item you can select one mode Display position and format Move Active Frame to Position button on the right side of OSD press ENTER to enter into...

Страница 53: ...you save the modification you can find the modification will be taken into effective You can press Cancel button or ESC key to abort Camera Name In Image Setup menu you can define name for each camera...

Страница 54: ...p the camera name position You can copy the position to any other camera The setup steps are Step 1 Enter into Image Setup menu Step 2 Select one camera Step 3 Enable the check box on the right side o...

Страница 55: ...r into Image Setup menu Step 2 Select camera Please use keys to select one camera Step 3 Adjust brightness contrast saturation and hue Move Active Frame to the Adjust button on the right side of Brigh...

Страница 56: ...s Confirm button to save parameters and make them into effective Otherwise press Cancel button or ESC key to abort modification 5 7 Mask Area Setup In some cases maybe you want mask the sensitive area...

Страница 57: ...or NTSC you can use keys to move the yellow pane to your hope position and press EDIT key the yellow pane will be turned into red then you can use keys to extend the red pane This red area is the mask...

Страница 58: ...Confirm button to save the mask area press Cancel button to abort Here is the example for mask area function If you disable the mask check box you can cancel the mask area...

Страница 59: ...ct the sensitivity for View Tampering item The sensitivity options are Low Normal and High Select one of them will active Area Setup and Policy Setup function Step 4 View tampering area setup Move Act...

Страница 60: ...can not be repeated Please reboot DVR to make the parameters into effective Step 7 Setup alarm policy If there is view tampering alarm happened in schedule DVR will response based on the policy You ca...

Страница 61: ...ew tampering area Note Only one view tampering area can be setup for each camera The view tampering area can not be copied If the schedule is modified you must reboot the device to make the parameters...

Страница 62: ...ppened in the schedule DVR will response Note The 4 time periods can not be repeated Please reboot DVR to make parameters into effective Step 5 Setup alarm policy You can select one or more response s...

Страница 63: ...will make alarm Step 1 Enter into Image Setup menu Step 2 Select camera Use key to select one camera Step 3 Select motion detection sensitivity On the right side of Motion Det Level item there is a li...

Страница 64: ...2 15 There is one yellow panel on the upper left side The motion area setup steps are the same as that of mask area setup refer to chapter 5 7 The only differences are that you can use PTZ key to set...

Страница 65: ...tch key z Right enlarge red pane z Left shrink red pane z Down enlarge red pane z Up shrink red pane z PTZ Set whole screen as motion area z A Clear all motion areas z ENTER Save and return Image Setu...

Страница 66: ...the cameras start recording in Recording menu you must enable recording schedule and set Rec Type as Motion Detection or Motion Alarm Please refer to chapter 5 12 for recording setup Step 7 Motion al...

Страница 67: ...seconds When the motion alarm is disappeared DVR will restore preview mode Step 9 Save motion alarm setup Press Confirm button to return Image Setup menu In the Image Setup menu press Confirm button t...

Страница 68: ...ew mode For preview mode item you can use key to select one mode If DVR has only 1 channel you can select only 1 Screen option If DVR has 4 channels there are 1 Screen and 4 Screen options If DVR has...

Страница 69: ...view mode this frame is divided into 4 windows Each window represents one camera You can move Active Frame among the windows There is one bar under the square to display the preview order of all camer...

Страница 70: ...e the earliest recorded files and continue recording If you select Stop recording option when all HDDs are all full DVR will handle it as Hard Disk Full exception please refer to chapter 5 17 for exce...

Страница 71: ...ch movement DVR will use high bit rate In this case DVR can save HDD usage and network bandwidth If you select fixed bit rate DVR will use the fixed bit rate to compress image The bit rate size is def...

Страница 72: ...ord MaxPreRecord is to save all data in PreRecord buffer The PreRecord time is related with bit rate The lower bit rate the longer PreRecord time is If the bit rate Max bit rate is very low and you se...

Страница 73: ...hursday Friday Saturday and Sunday Use keys to select one day Move Active Frame to the check box on the right side of All Day item press ENTER or EDIT key to enable All Day option means disable and 9...

Страница 74: ...ble all day recording option For Day item there are options Monday Tuesday Wednesday Thursday Friday Saturday and Sunday Use keys to select one day Move Active Frame to the check box on the right side...

Страница 75: ...days Step 5 Save Press Confirm back to Recording menu Press Confirm again to save the parameters and return main menu Note 1 If record type is Motion Detect or other related types you must setup Moti...

Страница 76: ...ere are 16 external alarm input and 4 relay output In Alarms menu you can setup for each external alarm input In main menu move Active Frame to Alarms icon and press ENTER key to enter into alarms men...

Страница 77: ...els to record for each alarm input In the sub menu you can use ENTER or EDIT key to enable record channel means disable and 9 means enable Note In order to trigger the channel to record in Recording m...

Страница 78: ...tton and return Alarms menu In Alarms menu press Confirm button to save the parameters Step 8 PTZ Linkage Move Active Frame to PTZ Linkage button press ENTER key to enter into PTZ Linkage setup menu F...

Страница 79: ...he parameters Press Cancel button or ESC key to abort Alarm relay output setup Step 1 In Alarms menu use keys to select one alarm output Step 2 Select delay time The delay time is when the alarm disap...

Страница 80: ...m button to return Alarms menu Step 5 Copy one alarm output parameters to other alarm output In Alarms menu you can copy parameters of current alarm output to other alarm output Step 6 Save setup When...

Страница 81: ...u can enter into Network menu as following Network menu description NIC type Default is 10M 100M Auto the other options are 10M Half Dup 10M Full Dup 100M Half Dup and 100M Full Dup IP address This IP...

Страница 82: ...for using DNS feature Multicast IP It is one D class IP address among 224 0 0 0 239 255 255 255 If you do not use multicast function you do not need to set Some routers will prohibit multicast functi...

Страница 83: ...PoE function set PPPoE flag as Input PPPoE username password and verify password that ISP provided Step 6 Save parameters In Network menu press Confirm to save parameters Reboot DVR to make parameters...

Страница 84: ...d WX Pelco D VCOM VC 2000 NetStreamer SAE YAAN Samsung Kalatel 312 CELOTEX TLPelco p TLHHX 2000 BBV RM110 KC3360S ACES ALSON INV3609HD Howell Tc Pelco P Tc Pelco D AUTO M AUTO H ANTEN CHANGLIN DeltaDo...

Страница 85: ...es one preset number dwell time and dwell speed Please make sure the PTZ you are using can support sequence function before you start to setup You can save 16 sequence Cruise setup Cruise is rememberi...

Страница 86: ...can delete this preset number After deleting press Return button to PTZ menu In PTZ menu press Confirm button to save all modification Please make sure the PTZ you are using can support preset functio...

Страница 87: ...ion Please make sure the PTZ you are using can support sequence function Cruise setup In PTZ menu press Setup button on the right side of Cruise item you can enter into Cruise setup menu Press RecCru...

Страница 88: ...parameters Including baud rate data bit stop bit parity flow control etc Work mode The RS 232 can be used as Console PPP or Transparent Channel Console Connect with PC serial port You can use HyperTe...

Страница 89: ...ote IP and Local IP are in the same sub net Username password and Verify password Only used when work mode is PPP Used for login when remote PC dialup through PSTN Phone Only used when work mode is PP...

Страница 90: ...te can be selected under 4FPS You can adjust bit rate resolution and frame rate according to real conditions Step 3 Save setup In Recording menu press Confirm button to save parameters Step 4 Setup Mo...

Страница 91: ...parameters Step 2 Open Network and Dial up Connections in control panel then press New Connection select Dial up to private network according to the guide Select the corresponding MODEM input the tel...

Страница 92: ......

Страница 93: ...he same as that DVR PPP setup Step 4 During the dialup connection it will give the message of verification of username and password after successfully verification the message will be given on process...

Страница 94: ...IP address through Ping command and can Ping link DVR Please refer to the following picture Step 6 You can preview the image of 192 1 0 2 by using client end software...

Страница 95: ...iffer Enter into Exceptions menu Including the following handle methods Audible Warning DVR beep warning Upload to Center Send exception information to center host PC Trigger Alarm Output trigger loca...

Страница 96: ...recorded and playback The following description indicates how to carry out relevant parameter setting according to different links to ATM machine In Transaction Information menu there are 4 kinds of...

Страница 97: ...nd length of transaction type Transaction type and code When the ATM machine is sending transaction information to bank center DVR will capture the data package through network and analyze the data ac...

Страница 98: ...tocol The software will send the transaction information directly to the DVR DVR will receive analyze and overlay the text on live video 2 Receive data sent by ATM through serial port The connection i...

Страница 99: ...DVR as transparent channel mode as following A software must be run in the ATM machine and send the credit card number transaction code to DVR through RS 232 port Please provide detail ATM machine com...

Страница 100: ...M through serial port In the case you must set the RS 232 of DVR as transparent channel mode as following Also a software must be run in ATM machine and send command to DVR through RS 232 port based o...

Страница 101: ......

Страница 102: ...menu Including SavePara RestorePara Upgrade Hard Disk Stop Alarm Out Reboot Power Off View Log and System Info Enter into Utilities menu 6 1 Save Parameters Save factory default parameters into FLASH...

Страница 103: ...r DVR The IP address gateway and port number will not be restored 6 3 Upgrade You can use this function to upgrade the firmware Please confirm the language is matched Press Upgrade icon in the pop up...

Страница 104: ...DVR will connect with FTP server through network and download the firmware file If you select USB mode please make sure you connect one USB flash memory with DVR and the firmware file is in it s root...

Страница 105: ...ing stop all recording After formatting you must reboot DVR otherwise DVR will not work normally 6 5 Clear Alarm Out Clear the alarm output manually 6 6 Reboot Reboot DVR 6 7 Power Off Shut down DVR 6...

Страница 106: ...l Shut Panel Login Panel Logout Panel Config Panel File Play Panel Time Play Local Start Record Local Stop Record Panel PTZ Panel Preview Panel Set Time Local Upgrade Net Login Net Logout Net Start Re...

Страница 107: ...to Search Log button press ENTER key to start searching Step 4 When searching is finished DVR will list all matched alarm information In the list box the information includes Index Occur Time Major T...

Страница 108: ...Time for Query option to active Major Type Minor Type Start Time and Stop Time items Step 2 Select Operation for major type and select one option for minor type Step 3 Input start time and stop time S...

Страница 109: ...6 9 System Information Press System Info icon in Utilities menu you can get DVR system information...

Страница 110: ...two cases that you need to upgrade DVR firmware One is update old firmware The other is when the code in DVR FLASH is crashed Note Make sure that the DVR and the firmware are compatible before the up...

Страница 111: ...2 Select Logging in the menu choose Log Options in the sub menu and give the choice as following 3 Select Users rights under Security menu item The following dialog box will be pop up...

Страница 112: ...password dialog input password target in New Password and Verify Password edit box Click OK to save and exit the dialog box 6 In the User Rights Security Dialog select User Name as target In Home Dir...

Страница 113: ...7 Next time you need not setup again just double click and open wftpd32 exe to upgrade the DVR DVS firmware...

Страница 114: ...rver and HyperTerminal software and make sure DVR and host PC are in the same sub net Please use DTE cable to connect DVR will host PC Step 1 Setup and run HyperTerminal The parameters are Baud rate 1...

Страница 115: ...firmware file are setup and run correctly After upgrade finished press any key to reboot DVR...

Страница 116: ...Appendix A For Disk occupation calculation you can use the Quaddrix HDD calculator this tool is available in the Quaddrix web page www quaddrix com in the Tech Support section HDD CALCULATOR...

Страница 117: ...to the actual demand but must be within 100m 2 standard RJ45 head one tool for RJ45 Suggestion have a network cable test tool to test each cable made Pin definition To make the network cable according...

Страница 118: ...corresponding relationship of the direct cable 2 Use the following method to make the cross network cable when DVR is directly connected with client end PC The corresponding relationship of cross cab...

Страница 119: ...nterface like PC COM port Pin definition It means DVR input and O means DVR output Pin index Name I O Description 1 DCD I Carrier Detect 2 RXD I Receive Data 3 TXD O Transfer Data 4 DTR O Terminal Dev...

Страница 120: ...ical Level 1 0Vp p resistance 75 Video output 1 channel BNC Electrical Level 1 0Vp p resistance 75 Video loop out 4 8 16 Total frame rate PAL 100FPS NTSC 120FPS PAL 100FPS NTSC 120FPS PAL 200FPS NTSC...

Страница 121: ...GB or 2 HDD IDE CD RW DVD RW USB interface 1 USB interface USB1 1 can support USB flash memory USB HDD USB CD RW DVD RW VGA interface 1 VGA interface support resolution 800 600 60Hz 800 600 75Hz 1024...

Страница 122: ...D R RW CRX225E Converter cable 5 BENQ external EW162I OK2 IDE CD R W 1 Sony CD R RW CRX225E 2 NEC DVD R RW CD R RW ND 3500A 3 Toshiba Samsung CD RW SH R522 4 LG GCE 8525B CD R W IDE HDD Maxtor 1 Diamo...

Страница 123: ...9 ce ST3160022ACE 160GB 7 DB35 Series ST3250823ACE 250GB 8 DB35 Series ST3300831ACE 300GB 9 SV35 Series ST3160812AV 160GB 10 SV35 Series ST3250824AV 250GB West Digital 1 WD Caviar WD400BB 2 WD Caviar...

Страница 124: ...D information 6 4 Recording mode Manual record All time record Motion detection record Alarm record Motion Alarm record Motion Alarm record 5 12 Recording para Bit rate Frame rate Image quality etc 5...

Страница 125: ...g video loss status display 4 2 ASDL Using PPPoE dialup function support DNS 5 14 Preview TCP UDP RTP Multicast Control Control DVR through network Alarm Send alarm information to host PC through netw...

Страница 126: ...Front panel cable is broken 2 Fan is broken After plugging in power turning on switch POWER light turn to green the indicator lights in the panel turn on at the same time but fan does not work The ATX...

Страница 127: ...1 Baud rate is not matched 2 RS 232 cable is broken 3 Serial port of PC is broken 4 RS 232 port of DVR is broken DVR can not control PTZ through RS 485 port 1 RS 485 cable is not connected correctly...

Страница 128: ...rates within the allowed range of temperature and humidity as in specification 2 If the circuit board is wet dust on circuit board can cause a short circuit The circuit board plug and socket housing f...

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