What are the precautions for the installation and operation of surveillance cameras?

I. Camera installation:

1. On the premise of knowing the requirements of the field of view of the supervision target, its installation height: the installation height of the indoor camera is appropriate to 2.5 ~ 5m, and the outdoor camera is appropriate to 3.5 ~ 10m; The elevator car box is installed on the top, diagonal to the elevator operator, and the optical axis of the camera is 45 degrees with the two walls and the ceiling of the elevator.



2. The camera and its supporting devices should pay attention to prevent damage and coordinate with the surrounding environment.

3, in the strong electromagnetic interference environment, the camera installation should be insulated from the ground.

4, outdoor installation to take lightning protection measures.

5. The camera must be installed firmly to prevent the jitter of the monitoring picture.

6, debugging the infrared lamp must be carried out at night. The illumination position of the infrared beam is adjusted by the imaging device (such as the monitor) at night. And can effectively adjust the lens aperture Settings.

7, infrared lamp installation height should not exceed 4 meters, too high will affect the reflectivity of light. The Angle should be 20 degrees from the top to the bottom, and the reflectivity will be reduced if the elevation Angle is too large.

8, infrared camera, as far as possible to avoid direct light source, because the infrared lamp power control department is based on the photoresistor installed on the infrared lamp board to control the working power of the infrared lamp on or not.

9, the infrared camera field of view should be avoided as far as possible to have full dark objects, open space, water and other objects absorbing infrared light, CCD camera matching infrared lamp is by emitting infrared light on the object reflected to the CCD camera lens into an image, if the infrared light is absorbed or weakened, will greatly weaken the effective illumination effect of infrared lamp

10, it is necessary to ensure the working indicators of the infrared lamp (see the product leaflet for details), such as the power supply of the infrared lamp must be higher than the working power of the infrared lamp itself.

11, users should first carefully read the use of infrared lights, especially to ensure the safety of personal equipment precautions. Check whether the aforementioned matching aspects meet the requirements, and whether the influencing factors should be taken into account. If the requirements are not met, the equipment used can be adjusted in time.

12, the installation process should pay attention not to touch the lens, CCD target surface, do not let the dust float to the camera above.


13. Installation of pan-tilt:

1) The installation of the pan-tilt should be firm, no shaking when rolling.

2) According to the product technical premise and system design requirements, check whether the rolling Angle range of the pan-tilt meets the requirements.

3) The decoder should be installed around the pan-tilt-head or in the ceiling (but the inspection hole should be left).

14. Avoid exposing the equipment to large motors such as elevators, water pumps and fluorescent columns, as well as various high-power radio equipment environments.

15, choose a good BNC head, this is very hub, poor BNC head will make you worse than death, not an exaggeration.

Aside from the topic, do the project must not cut corners, shoddy, a short time may be no problem, a long time, the problem must be exposed.

Ii. Installation of lines:

1, video cable: SYV75-3 video cable generally transmission within 300 meters, 75-5 transmission within 500 meters, 75-7 can transmit 800 meters; In addition, we need to pay attention to the quality of CCTV coaxial cable, RG59U, RG6 and RG11 are required to be 100% copper core, and 95% copper braided shielding layer. The maximum resistance of the loop connection must not exceed 15 ohms. When the interval exceeds 500 meters, optical fiber cable transmission should be considered.

2, power cord: should choose flame retardant cable, protective skin is relatively strong, under the condition of saving project cost, as far as possible to use thick point to reduce the attenuation of power supply.

3, control line: generally choose with shielding 2*1.0 cable, RVVP2*1.0.

4. Threading pipe: PVC pipe can be used in general. Galvanized steel pipe should be used in buried or explosion-proof projects.

Iii. Installation of control equipment:



1, console, cabinet (frame) installation position should meet the design requirements, installation should be stable and firm, easy to operate and maintain. The back and side of the cabinet rack should meet the maintenance requirements.

2, all control, display, recording and other terminal equipment installation should be smooth, easy to operate. The monitor (screen) should avoid direct external light, and when unavoidable, light avoidance measures should be taken. The equipment installed in the console and cabinet (frame) should have ventilation and heat dissipation measures, and the internal connector should be connected with the equipment firmly.

3. All cables in the control room should be set up with cable grooves and entry holes according to the installation location of the equipment, arranged and bundled neatly, numbered, and with permanent marks.

4, control equipment working environment security system equipment are required to be installed in a clean air conditioning room, and required to be installed on the scale of 19" rack, equipment should be left between the appropriate space, the use of forced ventilation fan.

5. Ensure that the fire line, zero line and ground line of the power supply in the monitoring room are connected in accordance with the specifications. When the monitoring central equipment (supervisor, hard disk video recorder, matrix, video distributor) is on, the AC voltage level of the analog multimeter is used to measure the ground voltage of the above equipment housing and the video cable connector connected to the camera. The higher the voltage, the more likely to cause damage to the video output section of the camera. When the voltage is not zero, to avoid live unplug and plug the video cable.

Four, monitoring engineering common 50 questions

1. Why use regulated power supply in power supply system?

Prevent damage to monitoring equipment because of power supply voltage fluctuation (too high, too low).

2. Influence of whether the power supply is not disorderly on the server-side monitoring system?

The power supply is not messy will make the computer can not work properly, and even damage the computer power supply or motherboard.

3. The main functions and parameters to pay attention to when selecting the regulated power supply?

A: output power;

B: overvoltage protection function;

C: over-current protection function;

D: Output voltage range AC110 or AC220.

4. How to choose regulated power supply?

According to the actual situation, the output power of the regulated power supply is required to be greater than or equal to the sum of the total power of all electrical equipment.

5. How to use regulated power supply?

A: Firstly, the AC AC220v power supply is connected to the input terminal of the regulated power supply;

B: Connect the power line of the equipment requiring voltage regulation protection to the output end of AC220v of the voltage regulation power supply.

6. What is UPS power supply?

That is, the power supply is not interrupted. It has the functions of voltage stabilization, frequency stabilization, anti-interference and surge prevention.

Function: if the sudden power outage, UPS can continue to power the electrical equipment for a period of time.

7. The main functional parameters of UPS power supply?

A: maximum electric exile time;

B: Surge protection function;

8. How to choose the UPS power supply?

A: According to the size of the power consumption of the equipment to be protected.

B: According to the time required to maintain the power supply after the equipment to be protected is cut off.

9, to the computer equipped with UPS power benefits?

A: Prevent damage to the computer due to voltage instability or sudden power failure.

B: Provide the time for data retention and shutdown after power off.

10. What is the function of leakage protector?

When the electrical equipment leakage phenomenon, timely automatic power cut, protect the safety of staff and equipment.

11. Installation method of leakage protector?

The leakage protector is used together with the air switch and is installed at the front end of the equipment power supply.

12, leakage protection function test of leakage protector?

In the case of power, press the leakage test button (generally yellow), the air switch should jump away; At the same time the blue button jumps. The air switch can be closed only when the blue button is pressed.

13, the use of leakage protector?

A: The protector is used with the air switch.

B: Enter air switch → air switch output → leakage protector input → leakage protector output → load before AC is increased.

14. Determination method of whether the leakage protector is damaged?

A: Let the leakage protector empty load.

B: Power on to test whether its function is normal.

15. How does the infrared lamp work?

Multiple infrared light beams are emitted by lighting multiple groups of infrared light emitting diodes (λ=850nm).

16. The important role of infrared lamp in monitoring system?

A: It provides light source compensation when the light is insufficient, so that the camera can image clearly.

B: It ensures the concealment of the monitoring system.

17, accurate selection of infrared lamp method?

A: According to the size of the monitoring area.

B: The interval between the camera and the monitoring target.

18. How is the infrared lamp installed in the monitoring system?

Generally hoisted under the camera, the Angle is consistent with the camera lens.

19, the infrared lamp is damaged simple determination method?

Use the camera to point at the infrared lamp. When the infrared lamp works normally, the infrared lamp can be clearly seen through the supervisor. If the infrared lamp does not emit light, the infrared lamp may be damaged.

20. What are the main functions and parameters of conventional infrared lamps?

A: Central wavelength? λ=850nm;

B: Effective interval?? 10(meters)~100? (m);

C: launch Angle 70 degrees;

D: Power supply AC? 130~260V;

E: Operating temperature -30℃~60℃F: power consumption 12W;

G: Waterproof grade GB55H: all-weather aluminum structure.

21, the installation and use of conventional infrared lamp?

A: It is usually mounted under the camera.

B: The power supply is AC130V ~ AC260V.

22. Classification of multimeter?

A: Table of numbers;

B: Simulation table;

ACV: AC voltage level Ω resistance level;

ACA: alternating current profile - > | - diode;

DCV: DC voltage range DCA: DC current range.

23, multimeter in the measurement process range selection method?

A: When the range of the measured value is not known, the maximum range should be selected for measurement.

B: If the range is known, the range can be selected appropriately to improve the accuracy.

24. How to use a multimeter to detect short and broken lines in the construction process of three-level network wiring?

The multimeter resistance level was used for path detection. Short circuit detection.

25. How to use the multimeter to detect the power supply of the monitoring equipment in the maintenance process of the three-level network?

A: Video and audio controller. Power supply: input AC220V power supply board output +5 (3) -5 (1)

B: The power supply of the control host is 220V

C: The source of the monitoring sub-machine is:

26, the use of digital multimeter AC voltage measurement method?

Select ACV750V

27, the use of digital multimeter DC voltage measurement method?

Select DCV20V

28, hard disk video recorder accurate switch machine method?

A: Open the peripherals first, then the main engine.

B: First turn off the main machine, then turn off the external equipment.

29, hard disk video recorder simple maintenance and governance?

A: Check each connection line.

B: Remove dust often.

C: Often clean up the hard disk of the hard disk recorder.

30, hard disk video recorder in the operation of the process of sudden power failure should be how to deal with?

A: Shut off all peripheral power supplies first.

B: When an incoming call comes in, turn on the external device first, and then turn on the main engine in order to power on.

C: Let the system self-test completed, run the control system.

31, the role of the sound card in the hard disk video recorder?

The audio signal is converted from analog to digital to analog.

32, hard disk video recorder in the sound card interface function and role?

A: SPK - sound output;

B: LINEIN - linear output;

C: MIC -- Mic input;

33. The classification of speakers?

A: Active;

B: passive;

34, the method of speaker selection?

A: Active and passive

B: Antimagnetic

C: Power

D: Material

E: Sound quality

35. What are the notes for the transmission part?

Choose high-quality wire to reduce rework, regardless of the network cable or fiber, the selection of materials is very poor or improper use of a lot of problems.

36, the role of hard disk video recorder acquisition card in the server side monitoring system?

Video signal acquisition, the analog video signal into digital signal.

37. The function of each interface of the acquisition card on the hard disk video recorder?

A: Lotus seat: Video Input interface (RCA);

B: S - video input interface;

C: +5 volt or +12 volt output port.

38, video and audio controller in the server side of the main functions and role of the monitoring system?

A: Video signal acquisition.

B: Sending and receiving audio signals.

C: Built-in modem remote transmission module.

D: Remote access connection.

39. The name and function of the interface on the video and audio controller?

A: BNC block (8-channel video input)

B: NC block (local output) for local video output.

C: BNC block (local extension input) for video and audio controller cascade (video output from the device);

D: Type D 15-hole (used to connect to the monitoring host) for data and audio connection;

E: D-type 9-pin (data line).

40, the name of the input and output lines on the video and audio controller and the role played in the system?

A: The 15-core connection of type D is the connection for communication with the control host.

B: The 9-pin connection of type D is the communication connection between it and the computer.

41. What is the main function and role of the monitoring host in the server-side monitoring system?

A: Data audio communication with the video audio controller.

B: Data and audio communication with the monitoring sub-machine.

42. What is the name of the interface on the monitoring host and its function?

A: RJ-45 interface data, audio, communication (between monitoring sub-machine)

B: Data communication and audio exchange between D15 and video and audio controller.

43, the name of the input and output lines on the monitoring host and the role played in the system?

A: 1 pair is the RS-485 communication line.

B: 1 pairs are audio IN.

The C: 1 pair is the audio OUT.

D: 1 pair is the spare line.

44. How to check the power supply of the equipment through the status of the power indicator light on the video and audio controller (or monitoring host) panel?

The power indicator light is on for normal power supply, and if it is not on, check whether the power supply equipment is working normally.

45. What is the main function and role of the monitoring sub-machine in the server side monitoring system?

A: Call, alarm, intercom, attendance check function.

B: The video, audio and data signals from the guard post are transmitted to the computers in the duty room through special cables.

46. The name and function of the interface on the monitoring sub-machine?

A: Five BNC blocks are video interfaces (the first four are sentry, pan-tilt, relay, expansion and output)

B: Three RJ-45 crystal blocks are communication interfaces (data, audio and communication interfaces).

47, the name of the input and output lines on the monitoring sub-machine and the role played in the system?

8-core network cable: data audio communication cable;

Video Output (BNC) 75 Euro -5 coaxial cable for video signal transmission line.

48. Check the working condition of the monitoring sub-machine power through the status of the digital display on the panel of the monitoring sub-machine

After the sub-machine is powered on, the digital display code "-----------" indicates that the power supply works normally.

49. Hardware composition of server-side monitoring system?

A: Computers and speakers, microphones.

B: Video and audio controller.

C: Monitoring host (basic equipment).

50, server side system hardware connection?