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How AHD cameras connect to AHD DVRs, Connect tutorials ，Connection schematic

Why does my AHD camera have no images? See the right connection

720P 1MP 1080P 2MP AHD Camera Specifications:  Resolution  2.0 Mega Pixel 1080P 1.0 Mega Pixel 720P Image Sensor  CMOS with IR-CUT  Camera type  High performance HD-AHD AHD Coaxial   Effective Pixel  PAL:  1920*1080 @25fps  NTSC: 1920*1080 @30fps  Signal System  PAL/NTSC（NTSC for American/ PAL for European）  Lens size  2.8mm 3.6mm 6mm 8mm 12mm Options(2MP 1080p)  Video Standard  AHD(AHD TVI CVI CVBS Options)  Video Output  BNC High Definition Transmission Distance  Common 75-3 lines up to 300M  Minimum Illumination  0.01LUX/F1.2(Color) 0LUX (IR LED on)  IR-CUT  Auto switch(Switching by Infrared Light )  LED  24pcs/36pcs/48pcs IR LEDs 850mm IR  Shutter Speed  1/53~1/100000s  BLC  Auto  White Balance  Auto White Balance  Interface  BNC & DC Power  Frame Rate  25fps  HLC  Support  Operation Temperature  -10°C~55°C  Working Humidity  10% ~ 95%  Power Supply  DC12V/1A or more than 1A  weight  0.2kg-0.9kg

AHD DVR Hard Drive Disk InstallationStep 1 Loose the screws which are fixed on the box coverStep 2 Push and remove the coverStep3  Connect the hard drive to the DVR SystemStep 4 Fixed the Hard Drive Disk onto the box.Put the cover back to position and fixed the screws.Note that DVRs we sell do not include hard drives. You need to buy by yourself.   You can buy a nice DVR by this link: https://www.ansice.net/collections/dvr-nvr/products/hybrid-dvr-1080n-video-recorder-audio-1-ch-h-264-ahd-tvi-cvi-nvr-4-in-1-dvr-for-ahd-tvi-cvi-coaxial-hd-camera-xvi-coaxial-control-ip-camera-8-ch

H264 DVR NVR storage schedule 720p Cameras:24G/Day/Channel; 960p Cameras:30G/Day/Channel; 1080P cameras 76G/Day/Channel. Hard  Disk Capacity Storage time Numbers of cameras 720P 1MP 960P 1.3MP  1080P 2MP 500G 4 5 DAYS 4 DAYS 1.5 DAYS 1T 4 10 DAYS 5 DAYS 3 DAYS 2T 4 20 DAYS 16 DAYS 6 DAYS 3T 4 30 DAYS 24 DAYS 9 DAYS 4T 4 40 DAYS 32 DAYS 12 DAYS   Click this product link to see a nice AHD TVI CVI CVBS NVR all 5 in 1 DVR