Baijian Testing is mainly engaged in textile, insulation, cosmetics, food, hardware industry related product testing, as well as providing product certification services, but also in the broadening of the scope of the testing industry, the laboratory issued a report can be stamped CNAS/CMA/CAL qualification seal, the report is true and effective.

Report qualification: CNAS, CMA, CAL, etc.

Testing costs: according to customer needs and experimental complexity, quotation

sample size: according to the sample

size to choose the sample or door-to-door

display style: electronic version

Testing cycle: 3-15 working days (expedited).

How to detect the voltage of surveillance camera 1:

Used to detect the voltage of key points in the circuit to determine the fault point

2 disconnection method:

When there is a short circuit or excessive current in the circuit, use this method to reduce the fault range.

3. The image quality is poor, and it should be checked whether there are fingerprints or too dirty on the lens;

; Whether the aperture is adjusted properly; Poor contact of video cables; Is there a problem with the electronic shutter or white balance setting; Is the transmission distance too far; Whether the voltage is normal; Is there any interference source nearby; Is the CCD of the board machine uneven; Check whether the lens is a C-type interface or a CS type interface. If the C-type interface must be connected with a ring, or if the CS type interface is connected, remove the ring

There are no images on the 4 surveillance cameras, and it is necessary to check whether the power supply is properly connected and whether the power supply voltage meets the requirements (power supply error: DC12V+10% AC24V+5%); Check if the BNC head or video cable is in good contact; Check if the automatic aperture of the lens is turned on; Check whether the automatic aperture lens control line driven by video or DC is short circuited to ground; Check if the video leakage caused the CCD board video to burn all the way

If there is distortion or geometric distortion in the image, check if the optical lens used is abnormal;

; Is the output impedance switch of the monitor set at the 75 ohm terminal; Check if the impedance of the video connection cable used is 75 ohms

6 turns white and has a foggy appearance. Check if there is water mist inside the body;

; Check if the lens cover is tightly attached to the glass; Check if the body is equipped with a lens cover; Check if there is water mist inside the CCD of the board machine; Check if the electronic shutter of the machine is open (if it is open, turn it off)

7 Resistance detection method:

Used to determine the quality of a certain part of the circuit.

8 Current detection method:

Determine the fault by observing the current value.

9 touch method:

Open the casing and touch each component (chip) with your hand to see if it has overheated or exceeded the normal temperature. That is, your hand cannot stay on the component, and you will feel abnormal heat and determine the fault point.

The Baijian platform is committed to providing convenient testing services for enterprises and individuals.

. Simplify the testing process, improve the efficiency of testing services, use the Internet plus testing e-commerce to provide customers with diversified choices, fundamentally reduce testing costs, improve time efficiency, break industry limitations and bottlenecks, and create a new platform for industry innovation. The company's main business scope includes food, agricultural products, environmental soil, environmental protection, industry standard training, retail services, etc., providing you with high-quality and convenient testing services

Baijian is a comprehensive testing service platform, bringing together many CNAS, CMA, CAL and other qualification testing institutions all over the country.