Have you ever experienced the shock in the surveillance room? Last month, Lao Zhang, a security guard in a community, complained to me that the 6 surveillance screens suddenly broke down while on duty. When I retrieved the video, I found that the screen power supply module was burned. Where should I buy such a fatal device? Today we will talk about it in a breakdown - from electronic city stalls to mysterious manufacturers, these tricks are even more exciting than surveillance images.

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​​1. The monitoring screen is not an ordinary LED. If you make a mistake in the parameters, something big will happen.​
Don’t believe the nonsense that “all screens can be used as surveillance screens”! Last year, a factory used advertising screens to replace the pictures cheaply, and the results:

• The screen is stuck at 3 a.m. and theft process is missing
• Color block fault occurs during continuous operation for 72 hours
• I found that the timestamp was incorrect when playing back the video

​Hardcore parameter list:​

1. ​​Refresh rate must be ≥1920Hz——Fast moving objects will be moved quickly (test method: use your phone to slow motion to shoot the screen)
2. ​​Grayscale level 16bit starts——Otherwise, the night scene will be completely blurred into mosaics
3. ​​Support 7×24 hours of operation​——See if the heat dissipation hole is real (touch the shell temperature after 8 hours of starting the machine, it is dangerous to exceed 45℃)

Lessons from blood and tears: The contract must state that "supports multi-screen segmentation and synchronous playback", don't ask me how I know.

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​​2. The procurement channels are very deep and these verifications cannot be saved.​
Do you think everything will be fine if you find the manufacturer's official website? A security company hit a pit last year:

• The "surveillance screen" displayed on the web page is actually an old model with 3 years of inventory
• Promised smart dimming feature requires additional fees to unlock
• The control software was found to be pirated

​​Trial inspection trilogy:​

1. Real-time video of the workshop (note the assembly line date sign)
2. Test signal delay (put a stopwatch onto the monitoring screen)
3. Check the heat dissipation structure (disassemble the border to see if it is a real copper tube to heat dissipate)

Key reminder: Suppliers are required to provide a report on the use of the same model within 3 years. Youjia supermarket chain found that the average failure interval of a certain model is only 8,000 hours.

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​​3. Putting the installation location incorrectly is like buying it in vain​​
The most outrageous installation I have ever seen: Install the monitoring screen directly under the air conditioner outlet, and the result:

• Condensation causes short circuits on the circuit board
• Temperature difference deforms the screen border
• Dust accumulation speed is 3 times faster

​​Golden installation rules:​

• Ground height 1.2-1.5 meters (in accordance with ergonomic perspective)
• 2.8-3.2 meters away from the monitoring station (avoid visual fatigue)
• Avoid electromagnetic interference sources (elevators and substation boxes are separated by at least 5 meters)

Cold Knowledge: The lifespan of the screen installed on the south wall is 20% shorter than that of the north wall because direct sunlight accelerates aging.

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​​A self-questioning core questions​
Q: Why is the price difference between the monitoring screens of the same size tens of thousands?
A: The difference may be on the chipset. For example, an imported decoding chip supports 32-channel signals, while a domestic chip can only have 16-channel signals. Teach you how to check the configuration: it is a good product that can be switched smoothly with 8 4K cameras at the same time.

Q: Can you buy a second-hand monitoring screen?
A: Unless you know how to do it! There is a trick: let the seller start the computer to display a 256-level grayscale test map. If you can clearly distinguish between 1-5-level grayscale, you can consider it.

Q: How to deal with the emergency when the screen suddenly becomes black?
A: First unplug the power cord and wait for 5 minutes before restarting, 80% of the faults can heal themselves. The long-term plan is to install a voltage stabilizer in the distribution box, which is more practical than buying insurance.

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​​The secret that only veteran drivers know​

1. Clean the signal interface with a cotton swab every month (oxidation layer will cause a flash)
2. Prepare a UPS power supply (sudden power outage may burn the storage module)
3. Don't rush to turn on the computer when the screen temperature suddenly changes (such as turning on the heating first in the morning of the cold winter)
4. Always send more signals to important monitoring points (the main screen is broken on the top of the secondary screen)

After all, buying a surveillance screen is like choosing a security officer. If you lose the chain at a critical moment, you will be killed. Remember these numbers: 1920Hz refresh rate, 16bit grayscale, IP54 protection, look for it according to this standard, and keep it more reliable than what Lao Wang next door bought!

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