Language

 

1.Testing of Color Reproducibility.

 

 

A color monitor should be selected for testing this parameter.

 

Firstly, observe people and clothing from a distance to see if there is any color distortion.

 

Compare objects with bright colors and observe the sensitivity of the surveillance camera.

 

 

2. Measurement of clarity.

 

 

When testing surveillance cameras, the same lens should be used (recommended to use fixed focus and

 

two variable lenses), with the center circle of the test card appearing on the left and right sides of the monitor

 

screen as the standard. 

 

They respectively represent vertical clarity and horizontal clarity, and a corresponding set of lines has

 

been given.there are 350 lines vertically and 800 lines horizontally, it is best to use a black and white monitor

 

at thistime.

 

During testing, it is possible to focus on distant objects or focus while measuring. It's best to use both,

 

as you can see the difference between this camera (focusing on distance). 

 

 

3. Illumination.

 

 

Place the surveillance camera in a dark room with active 220V self igniting lights in front and behind.

 

Install a voltage regulator to adjust the brightness of the lights in the dark room. The voltage can be

 

adjusted from 0V to 250V. 

 

Indoor maximum to record the lowest illuminance value (the active light can be dimmed with a

 

voltage regulator to make it difficult to see the built-in image in the darkroom), and then the aperture

 

can be set to the minimum to record the lowest illuminance value. The front and rear lights can also be

 

adjusted to turn on and off separately. 

 

 

4. Backlight compensation for surveillance cameras.

 

 

There are two methods to test this parameter: one is to turn on the voltage regulating light on the

 

front side of the camera in a dark room, set it to the brightest, and then place a picture or text below the light.

 

Place the monitoring  camera in front of the light to see if the image and text can be seen clearly and if the

 

image is not dazzling. Adjust the AL and AX toggle switches to see if there is any change. Which one has the best

 

effect. Another way is to shine   the camera out of the window in sufficient sunlight, and see if the images and

 

text can be seen clearly. 

 

 

5. Power consumption of monitoring cameras.

 

 

The minimum working voltage is measured using a multimeter to measure the current, and a small voltage

 

regulator is used to adjust the voltage. In security systems, image generation mainly comes from CCD cameras. 

 

CCD is short for charge coupled device, which can convert light into charges and store and transfer them.

 

It can also retrieve stored charges to change the voltage.

 

Therefore, it is an ideal camera component, and CCD cameras composed of it are widely used due to their

 

small size, light weight, immunity to magnetic fields, and resistance to earthquakes and impacts.

 

 

6. Distortion of surveillance cameras.

 

 

To check for distortion in the surveillance camera, place the test card at the front of the camera so that the

 

entire sphere appears on the screen. 

 

Check for ellipses in the sphere shape, move the camera forward to see if the center of thecircle is enlarged,

 

and then test for curved distortion in the edges, corners, and frames from a distance.