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DS2400Q QAM Analyzer Operation Manual

DEVISER 90 DS2400Q

Figure 4-4-4

Figure 4-4-5

Three  pages  of  Limit  setting  have  been  provided
as  Figure  4-4-3,  Figure  4-4-4,  Figure  4-4-5,  Six
Limit  items  included  in  page  one(1/3)  ,  which  is
used for single analogue channel test. The default
value  of  these  Limit  items  are  list  as  Table
4-4-1.The  range  of  these  Limit  items  are  list  as

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Содержание 2400-DL

Страница 1: ...Operation Manual DS2400Q QAM Analyzer Ver 1 1 Tianjin Deviser Electronics Instrument Co Ltd Deviser Part No 2400 DL All rights reserved Printed in CHINA Jun 2011...

Страница 2: ......

Страница 3: ...rate correctly according to the manual Deviser shall have no responsibility for any defect or damage caused by improper use and maintenance or for any product which has been repaired or altered by any...

Страница 4: ...stics 4 1 4 Tilt Level List 4 1 5 Channel Scanning 4 1 6 Spectrum Scanning 4 1 7 Hum Measurement 5 1 8 Limit Measurement 5 1 9 Auto Test 5 1 10 Voltage Measurement 7 1 11 Multiple User Channel 7 1 12...

Страница 5: ...ser Channel Plan 13 3 3 Level Measurement 18 3 3 1 Analogue channel measurement 20 3 3 2 Digital channel measurement 25 3 3 3 Limit Display 29 3 4 Constellation Diagram 30 3 5 BER Statistics Measureme...

Страница 6: ...t 54 3 9 1 Soft Keys Operation 55 3 10 Limit Measurement 56 3 10 1 Test Results List 57 3 10 2 Limit Edit 60 3 11 Auto Test 61 3 11 1 Create New Project 63 3 11 2 Auto Test Storage 69 3 12 File Manage...

Страница 7: ...7 4 3 5 System upgrade 87 4 4 Measurement Parameter Setup 88 4 4 1 Level Unit 88 4 4 2 Level Calibrate 88 4 4 3 Limit Setup 89 4 4 4 Auto Diagnosis 95 4 4 5 Voltage and temperature 95 4 5 Channel Plan...

Страница 8: ...VI 5 1 Battery 104 6 Port 107 7 Specification 108 8 Standard Accessories 112...

Страница 9: ...This model can measure and display most indexes of Digital TV Channel Power MER BER Constellation Diagram Analog TV Single frequency Level Carrier Level of Full Channels Spectrum HUM Also DS2400Q can...

Страница 10: ...SER 2 DS2400Q Features QAM QPSK COFDM Test Level Test Channel Scanning Spectrum Tilt HUM Voltage Measurement Multiple User Channel Plan Setup File Management Intelligent Power Management Character Num...

Страница 11: ...t video level audio level and V A etc For Digital channels DS2400Q supports modulation modes of QAM QPSK and COFDM Here you can get Channel Power MER and BER NOTE MER BER test is only in QAM Modulatio...

Страница 12: ...itude and DS2400Q support 12 channels tilt max 1 5 Channel Scanning DS2400Q supports video and audio level display of all channels which could up to 160 channels most Also its zoom in out of 5 levels...

Страница 13: ...n distortion which comes from the low frequency interference of power supply 1 8 Limit Measurement DS2400Q can fast check the cable system by the limit test function Each enabled channel will be teste...

Страница 14: ...DS2400Q QAM Analyzer Operation Manual DEVISER 6 DS2400Q test the cable system You can set up test items including level spectrum limit test HUM tilt etc And the test result will be saved automatically...

Страница 15: ...ve user channel plans max which contains digital channels or analog channels or mixed channels Also they can be switched easily So it is very suitable for multi network maintenance 1 13 File Managemen...

Страница 16: ...VISER 8 DS2400Q DS2400Q with full charged is able to work over 5 hours The power supply monitoring system will monitor the status of power and ensure the instrument in power saving mode NOTE Charge th...

Страница 17: ...400Q QAM Analyzer Operation Manual DEVISER 9 DS2400Q 2 Introduction 2 1 Appearance Get acquainted with the appearance before use Serial Port RF Interface LCD Keyboard Charge Status POWER Charge Interf...

Страница 18: ...used to access the functions represented by the icons displayed on the bottom of screen 2 2 2 Shortcut keys There are three keys bellow the three soft keys including Press key can directly back to me...

Страница 19: ...DS2400Q QAM Analyzer Operation Manual DEVISER 11 DS2400Q 2 3 Display Description...

Страница 20: ...Function Menu Display Figure3 1 1 The Figure3 1 1 Display the Main Menu which include all of the function icons Soft Keys Enter the selected shortcut interface Switch the selected shortcut on the left...

Страница 21: ...ected shortcut will displays in highlight 3 2 Learn User Channel Plan In order to enhance your work efficiency please create user channel plan before measurement DS2400Q will choose all effective chan...

Страница 22: ...wing is the step of setup user channel plan 1 Connect the instrument with the cable system 2 Press return to main menu and select the Setup shortcut like Figure3 2 1 then press into Setup Menu Figure3...

Страница 23: ...DS2400Q QAM Analyzer Operation Manual DEVISER 15 DS2400Q Figure3 2 2 Now press into Figure3 2 3 CHANNEL PLAN then press select the user channel plan Figure3 2 3...

Страница 24: ...CHANNEL PLAN function displays as Figure 3 2 4 Figure3 2 4 Press to select one channel type 4 Press or into Parameter setting you can define the channel plan as Analogue channel plan digital channel p...

Страница 25: ...annels with level higher than 45dB V and digital channel with power level higher than 32dB V will be enabled in standard channel plan Only the enabled channels will be displayed in each measurement in...

Страница 26: ...Press return to main menu press the or to select the Level shortcut as Figure3 3 1 Then press Figure3 3 1 If there is no valid channel to test the screen will display as figure 3 3 2 Now if you want...

Страница 27: ...l DEVISER 19 DS2400Q Figure3 3 2 The channel list will display as figure 3 3 3 Press or to select the channel and here Press or will page up or page down the channel list Then press into channel infor...

Страница 28: ...parameter could be changed press to change As the figure 3 3 4 ensuring the STATUS is enable the channel will be enabled 3 3 1 Analogue channel measurement If the current channel is a valid analogue c...

Страница 29: ...on Manual DEVISER 21 DS2400Q Video Level Audio Level Figure3 3 5 CH INFO Press this button will display the channel information of this analogue channel as figure 3 3 6 The channel parameters also can...

Страница 30: ...isplay mode One channel and three channels One channel mode The histogram show the video and audio of current channel only Three channels mode The histogram shows the video and audio of current channe...

Страница 31: ...DS2400Q QAM Analyzer Operation Manual DEVISER 23 DS2400Q Figure 3 3 7 Press this button to next page as figure 3 3 8 the user can press this button again to return Figure 3 3 8...

Страница 32: ...annel the screen will be changed Refer to next section SAVE Press this button to save the result of level test refer to 3 13 2 FREQ Press this button to show single frequency measurement interface as...

Страница 33: ...annel measurement In this function DS2400Q is able to measure POWER MER and BER As figure 3 3 10 Figure3 3 10 CH INFO Press this button will display the channel information of this digital channel as...

Страница 34: ...isplay mode One channel and Three channels One channel mode The histogram shows the video and audio of current channel only Three channels mode The histogram shows the video and audio of current chann...

Страница 35: ...DS2400Q QAM Analyzer Operation Manual DEVISER 27 DS2400Q Figure 3 3 12 Press this button to next page as figure 3 3 13 the user can press this button again to return Figure 3 3 13...

Страница 36: ...will be displayed as figure 3 3 5 SAVE Press this button to save the result of level test refer to 3 13 2 FREQ Press this button into frequency measurement interface as figure 3 3 14 In this mode the...

Страница 37: ...SS or FAIL in big font is displayed in the screen to indicate the quality of current channel as the figure 3 3 5 and figure 3 3 10 the limit value to judge the quality of channel can be showed in the...

Страница 38: ...choose constellation icon and then press to enter constellation measurement DS2400Q s constellation diagram function supports modes of QAM Here you can get channel POWER MER BER pre BER and post BER a...

Страница 39: ...ormation and user can modify all of the parameters in this menu FREQ Press this button to display the current frequency POWER MER BER pre BER and post BER and constellation diagram as figure 3 4 2 pre...

Страница 40: ...h the select quadrant on clockwise direction ZOOM IN ZOOM OUT Press this button and switch the status of constellation diagram between zoom in and normal mode Press zoom in key again the selected quad...

Страница 41: ...al DEVISER 33 DS2400Q Figure3 4 4 and are used for switching digital channels circularly Note This function only supports digital channels if the current user plan doesn t have any digital channels th...

Страница 42: ...DS2400Q QAM Analyzer Operation Manual DEVISER 34 DS2400Q Figure 3 4 5...

Страница 43: ...surement Press to return to main menu interface and press or choose statistics icon and then press to enter statistics measurement DS2400Q is able to make BER statistics during set time the user can g...

Страница 44: ...one or more mistakes which can be corrected or not be corrected and then ES plus1 SES Serious error seconds During 1s if the result of the number of errors that can not be correct divided the total b...

Страница 45: ...nu TIME Press this button to set the statistics time DS2400Q supports several fixed time 5 minutes 15 minutes 30 minutes 60 minutes 2 hours 6 hours 12 hours 24 hours and 48hours START STOP Press this...

Страница 46: ...plitter s gain of cable system DS2400Q can get levels of 12 channels and observe the measurement result and graph easily Press to return to main menu interface and press or and choose Tilt icon then p...

Страница 47: ...s Figure 3 6 3 press or to change the highlight line and then press the to select or unselect the channel Here the and button have been defined to page up and page down The means this channel is selec...

Страница 48: ...o return to main menu interface and press the again to enter the Tilt Level List measurement Now the Tilt measurement can be continued 3 6 1 Tilt Mode In tilt test interface the channels will be displ...

Страница 49: ...DS2400Q QAM Analyzer Operation Manual DEVISER 41 DS2400Q Figure 3 6 3 3 6 1 1 Soft Keys Operation LIST Press LIST soft key to enter level list mode as Figure 3 6 4 Figure 3 6 4...

Страница 50: ...er into Figure 3 6 2 to re select tested channels 3 6 2 Level List Mode Press to switch the modes between Tilt and level list In level list mode you can easily get level value of the channels tested a...

Страница 51: ...ed channels Here the and button is defined to switch the tilt channel which s test result will be displayed at the bottom of screen A FAIL or PASS will be displayed at the bottom of the screen the Lim...

Страница 52: ...t the flatness and amplitude of cable TV system quickly Press to return to main menu interface and press or to select the SCAN icon and then press to enter Channel Scanning function as Figure 3 7 1 Th...

Страница 53: ...also display the channel number of scanning start channel and end channel 3 7 1 Soft Keys Operation TAB Press this button can modify the cursor location Then the parameter which highlighted on the ye...

Страница 54: ...witch between 1 2 3 4 and 5 by pressing or 1 Max display 30 channels in the screen 2 Max display 50 channels in the screen 3 Max display 75 channels in the screen 4 Max display 150 channels in the scr...

Страница 55: ...ss this button to next page as figure 3 7 2 the user can press this button again to return Figure 3 7 2 SAVE Press SAVE soft key and enter into Figure 3 13 2 to save the result of tilt test refer to 3...

Страница 56: ...menu interface and press or to select the spectrum icon and then press to enter spectrum function DS2400Q s spectrum function supports double marker display and peak hold function as Figure 3 8 1 Her...

Страница 57: ...he selected parameter can be modified by press or or by figure Input directly AUTO Press AUTO soft key to adjust reference level and scale quickly The meter will automatically adjust them to most opti...

Страница 58: ...lt of tilt test refer to 3 13 2 STOP Pressing STOP soft key the scanning will be stopped and you can continue the scanning by press it again 3 8 2 Parameter Setting You can modify or adjust measuremen...

Страница 59: ...ess or to select the sampling mode AVG or PEAK AVG sample average mode the display result of each point will be an average of several sample value It will be faster than the PEAK mode and also if you...

Страница 60: ...3 8 4 Figure 3 8 4 SCALE After selecting the SCALE parameter press or to choose one scale from 1dB 2dB 5dB and 10dB CENTER FREQUENCY After selecting the CENT parameter you can input the center frequen...

Страница 61: ...eter if you select the MAX HOLD by pressing or the screen will display both the max value and the real time value of each point MARKA After selecting the MARKA parameter the red marker A becomes activ...

Страница 62: ...nt to analogue channel Press to return to main menu interface and press or to select the HUM icon and then press to enter HUM function Show as Figure 3 9 1 HUM modulation is also named power hum modul...

Страница 63: ...0Hz soft key the DS2400Q will select the frequency of system power as figure 3 9 2 Figure 3 9 2 or are used to switch analogue channels circularly Also you can input the channel number using the chara...

Страница 64: ...ress to enter LIMIT function As shown in figure 3 10 1 DS2400Q is able to detect cable TV system rapidly and check out the number of unqualified channels and the reason of unqualified channels The amp...

Страница 65: ...mit Test mode 3 10 1 Test Results List After the limit test scanning the general test results of cable system will be listed The test items are consist of minimum video level maximum video level maxim...

Страница 66: ...DS2400Q QAM Analyzer Operation Manual DEVISER 58 DS2400Q Press to list as figure 3 10 3 Figure 3 10 3 Press to view the graph as figure 3 10 4 Figure 3 10 4...

Страница 67: ...DS2400Q Press this button to next page as figure 3 10 5 the user can press this button again to return Figure 3 10 5 RETEST Press RETEST to retest SAVE Press SAVE soft key and enter into Figure 3 13 2...

Страница 68: ...etup in SETUP First enter into SETUP menu press into MEASUREMENT Setting highlight LIMIT SETUP by or the screen displays as figure 3 10 6 Figure 3 10 6 If you want to change a parameter press to selec...

Страница 69: ...lect the R PATH icon and then press to enter R PATH function as Figure 3 11 1 Figure3 11 1 In the interface of the R PATH function the default parameter set is Start frequency 5MHz Stop frequency 65MH...

Страница 70: ...ey to the main menu press or to select the AUTO icon and then press to enter The screen displays as Figure 3 12 1 User can store all test items in one testing project and when you start this project t...

Страница 71: ...on DS2400Q will guide you to build a new project step by step Step 1 Create Project Name Press to create a new project as Figure 3 12 2 You can name the new project Figure 3 12 2 Step 2 Select test it...

Страница 72: ...he green indicates the item has been enabled after set press DOWN to next step or UP to return without save The screen displays as figure 3 12 3 Figure 3 12 3 Step 3 Edit test items According to diffe...

Страница 73: ...hen edit LEVEL test parameter move the cursor by or and disable or enable the measured channels by pressing The channel marked by will be tested in LEVEL item of auto test procedure Be sure to confirm...

Страница 74: ...When edit tilt test parameter move the cursor by or and disable or enable the measured channels by pressing The channel marked by will be tested in TILT item of auto test procedure Be sure to confirm...

Страница 75: ...DS2400Q QAM Analyzer Operation Manual DEVISER 67 DS2400Q Figure 3 12 6 3 When you edit SPECT parameter you are able to edit center frequency span as figure 3 12 7 Figure 3 12 7...

Страница 76: ...ured channels by pressing The analog channel marked by will be tested in HUM item of auto test procedure Be sure to confirm the entry by pressing button and return to previous menu as figure 3 12 8 Fi...

Страница 77: ...e 3 12 9 Step 4 Auto Start After editing limit test parameter press button and return to previous menu Press to start the auto test 3 12 2 Auto Test Storage After the auto test the file name will be a...

Страница 78: ...DS2400Q QAM Analyzer Operation Manual DEVISER 70 DS2400Q Figure 3 12 10...

Страница 79: ...enter FILE management function as Figure 3 13 1 DS2400Q has independent memory space to store the measurement data The measurement data of level test analogue channels QAM test digital channels chann...

Страница 80: ...ILT SCAN SPECT LIMIT and HUM at least one of them Press and select the FILE icon and then press the file list menu will display as figure3 13 2 will be enabled as NEW press this button a SAVE THE FILE...

Страница 81: ...nual DEVISER 73 DS2400Q After rename the new file press or to DATA LIST all the parameters could be saved have been listed and the default status is that all parameters have been selected as figure 3...

Страница 82: ...ER 74 DS2400Q Figure 3 13 4 Press or to modify the cursor location and then press to select or unselect the data item as figure 3 13 5 press to save the file When the new file was saved the file list...

Страница 83: ...er Operation Manual DEVISER 75 DS2400Q Figure 3 13 6 3 13 3 Read File Press or to select the file you would like to read and then press to Load the file LOAD THE FILE dialog will display as figure 3 1...

Страница 84: ...R 76 DS2400Q Normally the data items can be opened using LIST mode press or to select the data item and then press LIST to list a data item in LIST mode as figure 3 13 8 3 13 9 3 13 10 3 13 11 3 13 12...

Страница 85: ...DS2400Q QAM Analyzer Operation Manual DEVISER 77 DS2400Q Figure 3 13 10 Figure 3 13 11...

Страница 86: ...DS2400Q QAM Analyzer Operation Manual DEVISER 78 DS2400Q Figure 3 13 12 Figure 3 13 13...

Страница 87: ...zer Operation Manual DEVISER 79 DS2400Q Figure 3 13 14 3 13 4 Delete File Select one file by press or and press DELETE to delete this selected file the DELETE FILE dialog will display as figure 3 13 1...

Страница 88: ...DS2400Q QAM Analyzer Operation Manual DEVISER 80 DS2400Q Press ENTER in figure 3 13 15 the file will be deleted as figure 3 13 16 Figure 3 13 16...

Страница 89: ...tup 4 1 Brief Introduction Press to return to main interface and press or to select the SETUP icon and then press to enter SETUP menu as Figure 4 1 1 Figure 4 1 1 INFORMATION General information of th...

Страница 90: ...selection date and time setting files status and system upgrade NOT INSTALL MEASUREMENT Level unit Level Calibrate Limit setup and Voltage temperature measurement CHANNEL PLAN The setup for channel p...

Страница 91: ...M Analyzer Operation Manual DEVISER 83 DS2400Q 4 2 INFORMATION This is the information of the instrument Refer to Figure 4 2 1 It includes serial number software version hardware version and so on Fig...

Страница 92: ...save the power the instrument can be set to shutdown automatically for inactive keypad after 3 minutes 5 minutes 10 minutes 30 minutes and ON never shutdown mode as Figure 4 3 1 To change the LCD brig...

Страница 93: ...al DEVISER 85 DS2400Q 4 3 2 Language Selection The language of DS2400Q can switch among English and Chinese as figure 4 3 2 After choose instrument will transform menu automatically Figure 4 3 2 Note...

Страница 94: ...DS2400Q QAM Analyzer Operation Manual DEVISER 86 DS2400Q 4 3 3 Date and Time When there is something wrong in system date or clock user can calibrate new date or time as Figure 4 3 3 Figure 4 3 3...

Страница 95: ...eration Manual DEVISER 87 DS2400Q 4 3 4 Files Status This interface shows the number of files have been saved and also show the Memory status as figure 4 3 4 Figure 4 3 4 4 3 5 System upgrade This fun...

Страница 96: ...DS2400Q QAM Analyzer Operation Manual DEVISER 88 DS2400Q 4 4 Measurement Parameter Setup 4 4 1 Level Unit Figure 4 4 1 4 4 2 Level Calibrate Figure 4 4 2...

Страница 97: ...2400Q User can make amendment and compensation of the measure data in all level measurement function press MODIFY to highlight the level offset box and then press or to adjust it and press ENTER to en...

Страница 98: ...Three pages of Limit setting have been provided as Figure 4 4 3 Figure 4 4 4 Figure 4 4 5 Six Limit items included in page one 1 3 which is used for single analogue channel test The default value of t...

Страница 99: ...than six dB Item Limit Minimum Video level 60dB V Maximum Video level 100dB V Minimum V A 10dB Maximum V A 20dB Maximum VID 10 dB Maximum VID DEV 3 dB Table 4 4 1 Item Limit Minimum Video level 30 99...

Страница 100: ...R MAX PRE BER and MAX POST BER The default value of these Limit items are list as Table 4 4 3 The range of these Limit items are list as Table 4 4 4 The difference between MAX POWER and MIN POWER must...

Страница 101: ...T BER 1 0E 3 1 0E 9 Table 4 4 4 Page three 3 3 is used for tilt measurement two limit items list including of MIN TILT and MAX TILT The default value of these Limit items are list as Table 4 4 5 The r...

Страница 102: ...oad default values of all limit items on each page please press the TAB to choose the LOAD DEFAULT button on the bottom of that page and then press to confirm NOTE If the digital channels have been in...

Страница 103: ...diagnosis function PASS and FAILURE as figure 4 4 6 Figure 4 4 6 NOTE Before the auto diagnosis function can be work correctly the Limit items in section 4 4 3 must be set the valid values 4 4 5 Volt...

Страница 104: ...oltage will be displayed on the screen When it is lower than 10 6V this meter will remind that it will shut down automatically soon Figure 4 4 7 4 4 5 2 Trunk Voltage AC LINE This meter will automatic...

Страница 105: ...anual DEVISER 97 DS2400Q Figure 4 4 8 4 4 5 3 Temperature Inside DS2400Q can monitor inside temperature itself and you can press or to choose the display unit Celsius or Fahrenheit refer to Figure 4 4...

Страница 106: ...DS2400Q QAM Analyzer Operation Manual DEVISER 98 DS2400Q Figure4 4 10...

Страница 107: ...lect User Plan Up to five user plans can be built and saved The user plans are labeled as A B C D and E User can choose one as current user plan as Figure 4 5 1 Then the meter will measure according t...

Страница 108: ...mode or standard alphanumeric mode After choose the meter will show the channel number as you desired in any measurement mode Refer to Figure 4 5 2 Figure 4 5 2 4 5 3 Learn User Plan You can build an...

Страница 109: ...her user plans you can enter into SELECT USER PLAN and then make the LEARN USER PLAN operation Detailed operation refer to 3 2 4 5 4 Edit User Plan The user plan is combined by following Digital numer...

Страница 110: ...DEVISER 102 DS2400Q Figure 4 5 3 EDIT CHANNEL PLAN will show the channels list on the screen as Figure4 5 3 you can only exit this function by press the HOME key press or to highlight one channel and...

Страница 111: ...DS2400Q QAM Analyzer Operation Manual DEVISER 103 DS2400Q Figure 4 5 4 NOTE Any edit here will be saved when you exit the screen...

Страница 112: ...s below 11V the battery icon flashes in screen Once the voltage of the battery is lower than 10 6V the instrument will shut down automatically The charge time is about 3 hours NOTE 1 The meter can be...

Страница 113: ...harger output plug to DS2400Q DC charge socket 2 Connect the charger to AC 100V 240V Power and the charger indicator will light with red 3 When indicator become to green the instrument has been fully...

Страница 114: ...DS2400Q QAM Analyzer Operation Manual DEVISER 106 DS2400Q NOTE The instrument can not be charged in the temperature beyond 10 35 otherwise the battery life will be shorten...

Страница 115: ...hrough the 5 Pin communication port Refer to figure 6 1 Figure 6 1 1 TXD 2 RXD 3 NC 4 5V 5 GND Management PC software Toolbox is provided as standard You can remotely control the instrument to do the...

Страница 116: ...uracy 50 10 6 20 5 Resolution 10 KHz Receive bandwidth 280 KHz Channel Type Analogue TV TV Digital TV QPSK COFDM 16 32 64 128 256 QAM Analog Level Measurement Range 30dB V to 120dB V Accuracy 1 5dB Re...

Страница 117: ...bandwidth Enactment MER 39dB representative Accuracy 2dB BER 1E 3 to 1E 9 Before and After R S Decoding Power measure type QAM QPSK COFDM Average Power Level range 30dB V to 110dB V Accuracy 2 0dB res...

Страница 118: ...on Frequency spectrum Bandwidth 2 5MHz 6 25MHz 12 5MHz 25MHz 62 5MHz fullband Scale 1 2 5 10 dB div Tilt measurement Number of channels 4 to 12 Resolution 0 1dB Trunk Voltage measurement Input range 0...

Страница 119: ...0Q Store Temperature 20 50 Dimensions Handset about 218mm 95mm 49mm Weight Handset about 700g Display 320 240 OLED Power supply Battery 11 1V 1 6AH Lithium battery Charger AC 100 V to 240V 50 60Hz Wor...

Страница 120: ...r Operation Manual DEVISER 112 DS2400Q 8 Standard Accessories Standard Accessories Quantit y DS2400Q 1 AC DC power adapter charger 1 Data cable Serial to USB 1 Carrying bag 1 F connect 2 Manual and To...

Страница 121: ...QAM Analyzer Operation Manual DEVISER 113 DS2400Q Add NO 40 YiBin Road Nankai District Tianjin 300113 China Tel 86 22 27645003 803 Fax 86 22 27645002 Http www devisertek com E Mail overseasbiz deviser...

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