April 14, 2023

Work to install surveillance cameras at these points! I see, you're also a security expert.

As there are more and more monitoring professionals, newcomers who have just joined industry can start by installing simplest equipment first, gradually gaining hands-on experience and becoming project managers who can manage projects on their own. So, in process of installing a surveillance camera, what should I pay attention to when protecting camera?

Work to install surveillance cameras at these points! I see, you're also a security expert.

A few things to keep in mind while monitoring installation:

1. Location Requirements

For surveillance cameras, location is directly related to visual effect of equipment. Therefore, many users consider surveillance effect as main guideline when choosing a location for installing a surveillance camera. However, they missed a very important point: surveillance camera is not omnipotent, besides, it has its own requirements for choosing a place to install. Better camera and survival effects. When installing indoors, we must do our best to ensure that height of equipment is not lower than 2.5 meters, and outdoors, we also need to place monitoring equipment at a height of more than 3 and half meters from ground. Otherwise, whether in terms of camera self-protection or equipment monitoring, it will have many negative consequences. Only after considering these very basic questions does angle become aspect that we consider.

Work to install surveillance cameras at these points! I see, you're also a security expert.

2. Mounting angle

There are two main types: cylindrical and hemispherical. Among them, cylindrical type is more common and can be used both indoors and outdoors; hemispherical type is usually used indoors and has a small volume that can be fixed to a wall or ceiling.

When installing surveillance camera, you should also pay attention to angle problem. For ordinary cameras without wide dynamic function, direct light source should be avoided, and it is better not to install against light. The principle and method of adjusting backlight compensation of camera ! The surveillance camera must be securely fixed during installation so that screen does not shake. For wall, you can drill holes with a hammer drill, plug dowel, and then fix bracket to wall with screws. problem: choice of camera mount bracket should also be given attention.

Try choosing a dedicated bracket for outdoor use. It won't cost you much, but wind resistance coefficient will be very different. The wireless bridge knows to use a thicker bracket, and camera chooses a bracket that is a bit of a hassle. Yes, camera position changes immediately.

3. Installation height

The installation height of surveillance camera should not be too low to prevent malicious damage by others, and should not be too high as it will be inconvenient for further maintenance. It is recommended that installation height be three or four meters. , which can be obtained by standing on a ladder. For cameras mounted on poles, follow-up maintenance must be taken into account. For example, measures such as installing ladders on poles, renting air vehicles are expensive, and since surveillance cameras are installed at high altitude, auxiliary tools such as ladders are required, so you must pay attention to safety. when climbing stairs to avoid danger of falling from great heights. For higher positions, be sure to fasten your seat belt before you start building.

Work to install surveillance cameras at these points! I see, you're also a security expert.

4. Electrical Safety

Surveillance cameras require separate power supply. When connecting strong electricity, you should also pay attention to safety. You can check with a multimeter and tester first to make sure power is on after power off. An outdoor surveillance camera is also installed. For quality waterproofing, it is best to buy a network surveillance camera with a waterproof tail. In addition, a small waterproof box can be installed under surveillance camera, and a power supply unit and connectors can be placed in waterproof box.

Pay attention to lightning protection. In areas prone to lightning strikes, surveillance cameras must be protected from lightning strikes. Video lightning protection modules and power modules can be used for lightning protection.

There are two power supply methods: DC power supply and PoE power supply. Compared with DC power supply, PoE power supply only needs to be connected to a PoE switch or NVR with a PoE hard disk to supply power. Construction and maintenance is easier and more convenient.

Work to install surveillance cameras at these points! I see, you're also a security expert.

Non-PoE power supply: Each camera needs wires, network cables, PVC sleeves, sockets, safety power supplies... Many accessories, wiring is messy, installation is complicated, and maintenance is easy. easy.

PoE power supply: one camera and one network cable, data and power can be transmitted at same time, simple and convenient.

Comparing two power supply methods, PoE power is easier and cost can be lower than non-PoE power.

Work to install surveillance cameras at these points! I see, you're also a security expert.

5. Lighting Requirements

When using security cameras at night, lighting equipment is usually required to avoid reflections and shadows, and infrared lighting can be used instead of conventional bulbs. However, users should use black and white surveillance cameras and network surveillance cameras with infrared lighting equipment, because black and white surveillance cameras are more sensitive to infrared light, and color surveillance cameras cannot perform infrared functions.

At present, many cameras have started using wide dynamic shooting function to improve image quality in backlit conditions, but this does not mean that camera can continue to work in strong lighting conditions. Because in strong light, direct strong light will easily make it difficult for camera to normally detect an accurate image, and eventually lead to irreversible discoloration of color filter on sensor chip, resulting in banding on surveillance camera image. .

Therefore, we try to keep camera in "front light" mode whenever possible, but in any case, we should avoid direct exposure of camera lens to strong light for a long time.

If you want to be on site at night, you must use an IPC with good night vision. Night vision range is mainly determined by amount of infrared rays. The night vision distance of single lights is 30 meters, and night vision distance of double lights is 50 meters.

Work to install surveillance cameras at these points! I see, you're also a security expert.

6. Cables and connectors:

As for network camera, its in-line method is obviously more common than traditional analog equipment. However, no matter which transmission method is used, interference is one of issues that should be taken into account. Especially for video signals transmitted by cable, unidirectional transmission of signal lines and high-power electric lines is undoubtedly a taboo in wiring process, not to mention putting them in same transmission line pipe for ease of construction.

Even if they cannot be separated due to environmental restrictions, a distance of at least half a meter must be maintained. Only such a plan better avoids impact of strong magnetic interference on video transmission and for devices using wireless signal transmission, although there are less restrictions on lines.

However, camera itself must also avoid surrounding sources of strong magnetic interference. At same time, provide isolation between camera and ground. In addition, we also need to pay attention to avoid influence and obstruction of line on pan/tilt operation. Network cable of national standard with a wire of oxygen-free copper with a diameter of 0.5, with a gilded crystal head, a wire in a sheath RVV 2 * 0.5 for power cords up to 30 meters, a wire in a sheath RVV 2 * 0.75 for 30-50 meters, RVV 2* for power cords longer than 50 meters 1.0 sheathed wire, threaded pipe usually can use PVC, if underground or explosion proof, use galvanized steel pipe.

Work to install surveillance cameras at these points! I see, you're also a security expert.

7. Installing hardware accessories

In addition to some of full aspects mentioned above, some camera accessory installation specifications are also references that we should not ignore when building. For example, in order for installation sites for pan/tilt cameras, racks, and other equipment to meet design requirements, installation must be stable and durable, as well as easy to operate and maintain. The distance between back and side of shelving and wall must meet requirements of maintenance, if necessary, install protective covers or temperature control devices for cameras, etc.

For links with complex line connections, we must also specify use and characteristics of each line for further maintenance and sorting. The above is what we should pay attention to when setting up a simple key link network monitoring system. Compared to some complex large-scale monitoring systems, these aspects are obviously simpler and more intuitive.

But from a critical point of view, it can be said that these are vital connections that affect quality of camera, and they cannot be ignored. Only when we understand important but easily overlooked elements mentioned above can we enjoy a more efficient and convenient network monitoring effect.

Work to install surveillance cameras at these points! I see, you're also a security expert.

8. Installation and operation tips:

(1).The hard disk format of hard disk recorder is very slow. What is reason?

There must be a problem with hard drive, you can try replacing hard drive

(2) Why does network camera keep turning off?

The power supply is unstable, network connection is poor, and head of network cable is poorly made

(3), network camera is seriously freezing, what is reason?

The video stream of camera is too large, and bandwidth of switch and NVR is not enough

(4) how to install decoder on wall?

Enter address of decoder through computer browser, enter management interface of decoder to be set, or set it with IVMS4200 client software.

(5) how to connect network camera alarm?

A camera that supports alarm input is required, and there is "Alarm Input" on back of camera.

(6).How to connect webcam audio?

Requires a camera that supports audio, and back of camera has words "A in" or "Audio in"

(7) How to calculate power of a centralized DC source?

Regular cameras are powered by DC12V1A. For cameras with infrared fill light, a certain amount of current redundancy must be made. Select DC12V2A power supply to prevent camera from being underpowered when switching to infrared mode.

Work to install surveillance cameras at these points! I see, you're also a security expert.

(8) How far can SYV75-3 video cable transmit?

Theoretically, SYV75-3 video cable can transmit up to 300 meters, but in real projects, few people do it, use 75-3 within 100 meters

(9) How far can SYV75-5 video cable transmit?

Theoretically, SYV75-5 video cable can transmit up to 500 meters, but in real projects, few people do it, use 75-5 within 200 meters

9. How to add a VCR?

(1) Auto add, NVR will automatically scan and all online cameras can be displayed, just select "Add All";

(2) Add manually, select corresponding channel, click "Edit" to enter relevant camera information, "OK"

10. How to change camera IP?

(1) Open camera control interface from a computer browser, find network option, and enter address you want to change;

(2) In NVR, after finding camera, click "Edit" to enter changed address.

11. How to change address code of ball machine?

In general, speed domes do not need to change address code. There are two ways to change address code of analog dome machine:

(1) To change hard switch, there is a corresponding dial switch on ball machine movement, which is usually binary, and dial switch is set to desired address;

(2) Software modification, through preset position, call up menu of speed dome, it is possible to change address code, enter and modify.

12. How to determine millimeter of a lens?

In general, divide distance required for subject by 2 and then divide by 1000 to get number of millimeters of lens, and then adjust number of millimeters accordingly according to required shooting angle.

Work to install surveillance cameras at these points! I see, you're also a security expert.

Lens focal length

The focal length of camera lens is 2.8mm/4mm/6mm/8mm/12mm, etc. For each series of products, you can choose focal length of lens, which can meet needs of shooting in various indoor and outdoor open air. Generally speaking, longer focal length, smaller field of view and longer viewing distance.

Work to install surveillance cameras at these points! I see, you're also a security expert.

In real use scenarios, 2.8mm focal length is suitable for relatively narrow spaces such as elevators and stairs, while 4mm focal length is suitable for larger scenes such as conference rooms and shops, as well as more open spaces, such as parking lots, factory workshops, and backyards. In other places, you can choose a lens above 6mm, specific choice can be determined according to your needs.

Work to install surveillance cameras at these points! I see, you're also a security expert.

13. Where is focus of camera adjusted?

There are "FOCUS" and "ZOOM" labels on side or back of camera, which can be adjusted with a screwdriver

14. How to choose a disk array?

Firstly, calculate storage capacity needed for all front camera images, divide it by capacity of one hard drive to get number of drives, add number of management drives needed for RAID and number of hot drives. spare disks and get number of disks in array.

15. How is the network dome machine controlled?

NVR, client computer and network keyboard can control Network Ball machine.

Work to install surveillance cameras at these points! I see, you're also a security expert.

What is 16,485?

Communication interface 485 is a hardware description of a communication interface, it only needs two communication lines, meaning it can transfer data between two or more devices. This data connection is a half-duplex communication method. The device can only send data or receive data. 485, used for security monitoring, usually refers to PTZ control interface. After setting protocol and speed between control device and controlled device, a control operation can be performed.

17. How to adjust optical fiber according to actual situation?

Select fiber type and number of fibers according to total number of fibers and transmission mode required by system's optical transmission equipment. Determine number of fibers according to required transmission distance.

18. How far should fiber optic transceiver be tuned?

After signal transmission distance of network cable is exceeded (usually 100 meters), you should consider using fiber optic transmission.

Work to install surveillance cameras at these points! I see, you're also a security expert.

19. How to debug DVR remote control?

(1) In main menu, enter system settings - network settings - DDNS - enable DDNS checkbox - select appropriate domain name service station in DDNS type - enter username and password registered on this site - Of course.

(2) Enter router where DVR is connected to Internet, find "Rules" option, add port and save it.

20. Why can't analog DVR find mouse?

1. If it is mouse that comes with Hikvision, first press middle scroll wheel several times continuously. If not, please change USB interface. 2. Change main output port in system settings

21. What is recording memory of a 3 millionth camera in one hour?

Storage space for a 1-hour recording for a 3 millionth camera is about 3 GB. Depending on stream size set by camera, required hard disk space will be different

22. What is recording memory of a 2 millionth camera for one hour?

Two million cameras take up about 2 GB of disk space to record 1 hour of video, and amount of hard disk space required depends on stream size set by camera.

23. When 3 million are connected to a nominal 16-channel 2 million DVR, is it necessary to halve number of access channels?

NVR access channels = total NVR bandwidth ÷ camera code stream, larger code stream, fewer access channels, and theoretical code stream of a 3MP camera is 1/3 more than that of a 2M camera< /p>

24. How to choose an all-in-one platform for machine and decoder?

The all-in-one platform is a device that integrates decoding, control, splicing and other functions in one device. A decoder is simply decoding and wall uploading (gluing, screen splitting), which can be selected according to functional requirements of users.

25. What is role of a streaming media server?

When a large number of clients or surveillance webcams access network, ordinary DVRs cannot handle too much network load. At this time, streaming media server is required to pass client's access pressure to server.

Work to install surveillance cameras at these points! I see, you're also a security expert.

26. Do I still need a DVR when using a disk array?

The storage function of disk array where data is stored must be managed by storage server. Generally speaking, if there is a disk array, then DVR is not needed?

27. What is difference between an all-in-one machine and a mechanism?

The mechanism is a universal machine without a body, and universal machine can work independently, but mechanism cannot work independently. For normal operation, it must be connected to ball.

28. What is difference between LED and matrix lamps?

These two lights are essentially same, but dot matrix lights are more powerful and last longer than conventional LED lights.

29. How to calculate number of hybrid DVRs connected to network and simulation?

There is no need to calculate number of connected analog cameras, and number of BNC input interfaces on DVR is upper limit. For network cameras, according to pixel height of camera multiplied by number of cameras, it must be less than network access bandwidth of NVR. One channel of analog signal can be disabled, and one channel of network signal can be disabled. be added.

30. What if display is disabled after adding IPC?

1), IPC IP address setting is not in same network segment as NVR address

2) The network connection is not smooth, check if all 8 cores of network cable are connected.

31. What to do if there is no sound in local preview?

1. First check that audio cable and cartridge power cable are connected correctly

2. Is preview interface sound switch enabled

32. How to choose a camera lens millimeter?

As a rule of thumb, divide required field distance by 2 and then divide by 1000 to get approximate millimeters of required lens, and then adjust millimeters accordingly according to required shooting angle. The larger shooting angle, larger lens is smaller.

33. Why does screen turn black when previewing images using mobile client?

1. The server device is not connected to network. 2. The device added by client is incorrect, and IP address, port, username and password are incorrect

Work to install surveillance cameras at these points! I see, you're also a security expert.

34. The monitor display does not need a monitor. How can I connect it to my desktop computer?

Connect RJ45 interface on DVR to computer with a network cable and access video of VCR through computer client software

35. How to hook up a pickup?

Pickups on market usually have three wires: power cable + (mostly red) audio line + (mostly white) G common ground (mostly black), power cord "+" connected to "+" of power, " +" audio. connected to AUDIO IN of camera's audio input, and common ground G is connected to "-" of power supply and G of audio input

36. If you want to share part of video in a surveillance room to view in another surveillance room, how do you do it?

In analog system, one signal can be transmitted to another surveillance room through a video distributor, and network system can be directly connected to network cable, and image can be viewed through client computer

37. When will encoder be used? NVS encoder?

English encoder name: NETVIDEO SERVER (network video server) is also called video encoder, and its function is to encode analog camera video signal into network signal. When an analog camera's video signal needs to be connected to a network system, an encoder is required.

IPC and NVR support two encoding standards: H.264 and H.265. The latter is a next-generation coding standard that can compress video to half size without losing image quality. In case of same bandwidth, H.265 can carry higher definition video.

38. Does elevator use an encoder? What are pros and cons?

The encoder is used in elevator because accompanying cable in elevator is only a coaxial cable and there is no network cable. When more economical and practical elevator network cables are popularized in market, it is recommended to consider using a network camera. The encoder's maximum resolution is WD1, which is not as high as network camera pixels.

39. What is relationship between CCTV cameras and video capture cards?

The signal collected by video capture card is transmitted by frontal analog camera. Once collected and encoded with a capture card, digital set is transmitted to a computer, which is displayed and stored in real time. For reasons of stability and cost, capture cards are currently used on market. There aren't many of them.

Work to install surveillance cameras at these points! I see, you're also a security expert.

40. How to connect centralized power supply of camera?

The so-called centralized power supply means that power for all external equipment is uniformly supplied from central control room. There are two cases: 1. Centrally supply mains power to front, and place camera power adapter on side of camera. When wiring in this case, power line must be separated from video signal line, and power line must be protected by JDG pipes 2. Centralized power supply The DC power required for camera is routed to front end, while camera's power adapter is placed in control room at rear end. In this case, when wiring, power line and video line can share same line. If requirements are not strict, PVC pipes can be used. At same time, pay attention to relationship between DC transmission distance and wire diameter: farther transmission, larger required wire diameter.

41. What is wide dynamic range?

Wide dynamic shooting technology is a technology that allows camera to see characteristics of an image when optical fiber contrast is very strong. When image contains both areas of high brightness photographed by bright light sources (sunlight, lamps or reflections, etc.) and areas of relatively low brightness such as shadows and backlight, image output by camera will be bright. areas due to overexposure. The dark area becomes black due to underexposure, which seriously affects image quality. Camera performance in brightest and darkest areas in same scene is limited. This limitation is commonly referred to as "dynamic range"

42. What factors affect stable operation of network monitoring? Let me talk about most common factors:

1. Bandwidth, as name suggests, switch configuration

2. The choice of network cable and transmission cable depends on quality and speed

3. Crystal head, building technology level of construction workers

4. Comprehensive platform choice, big brands are trustworthy