Combined with the actual development of optical fiber communication transmission technology in China, it is in a stage of high development and continuous replacement and renovation. At this stage, with the continuous development of modern information technology in China, it has also been effectively applied in optical fiber communication transmission technology, which has effectively promoted the level of optical fiber communication transmission technology in China.Without exception, fiber optic pigtail Our customers are willing to purchase their products, because high quality is the concept of their products. https://www.fibercan-network.com/

　　

　　The so-called optical fiber communication transmission technology is suitable for optical fiber as a carrier to transmit information. In this project, the principle is the total reflection behavior of light waves in optical fiber, so as to effectively carry out information transmission activities. In modern optical fiber communication transmission technology, optical fiber communication transmission technology is widely used in the field of optical fiber communication because of its advantages of anti-interference and large capacity. In today’s era, we call it the “information superhighway”.

　　

　　First, explore the characteristics of modern optical fiber communication transmission technology

　　

　　1. It has large communication capacity.

　　

　　Combined with the actual development of modern optical fiber communication transmission technology, compared with the traditional optical fiber communication transmission technology, modern optical fiber communication transmission technology has a wider frequency band, which to some extent can meet the communication requirements of modern society, and then bring greater convenience to relevant communication users. However, in the single-wavelength modern optical fiber communication transmission system, due to many factors, such as receiving the terminal electronic bottleneck and other factors, modern optical fiber communication transmission technology can not show its own advantages. Based on this, relevant researchers have added a variety of auxiliary equipment for optical fiber communication transmission technology in order to improve its communication capacity and make modern optical fiber communication transmission technology no longer be limited by electronic bottlenecks.

　　

　　2. Strong anti-interference ability.

　　

　　When laying the communication network, the relevant laying personnel of the communication network should take certain protective measures for the optical fiber based on Shi Ying materials, so that it can have good insulation. After meeting the goal of optical fiber insulation, the modern optical fiber communication transmission technology can have certain anti-external interference ability, especially when the optical fiber technology is applied in a special power system, it can effectively reduce the influence of interference factors on itself and prevent the power communication system from being seriously affected by interference.

　　

　　Second, the practical application of modern optical fiber communication transmission technology.

　　

　　1. Optical signal switching technology in backbone nodes.

　　

　　According to the actual development of China’s communication network, there are still some communication networks constructed by using single optical switching technology, which leads to the slow information transmission speed in the communication network. In addition, when laying the communication network, the laying personnel usually use metal lines, which hinders the operation and development of the communication network and ultimately affects the operation efficiency of China’s communication network. Based on this, it is of great practical significance to apply modern optical fiber communication network to China’s network communication system. By using optical switching devices with large capacity, the related problems in traditional network communication in China can be effectively solved, for example, the problem of slow transmission speed in traditional communication networks can be solved. As we all know, the propagation speed of light is extremely fast, and it is the same in the network. Using this characteristic of light, large-capacity switching devices can exchange and decompose optical signals, effectively improve the information transmission efficiency in the communication network and realize the exchange of network information.

　　

　　2. Realize the single-fiber bidirectional transmission mode in the communication transmission process.

　　

　　Combined with the practical application of optical fiber communication and transmission technology in China, it is found that in the optical fiber communication and transmission project, due to the influence of equipment and devices, the capacity of the optical fiber itself cannot be effectively increased when carrying out communication and transmission work, which ultimately affects the efficiency of optical fiber information in the transmission process. At the present stage, China mostly adopts the dual-fiber bidirectional technology. In the process of optimizing and improving this technology, relevant researchers usually take the optical fiber communication transmission technology as the core, effectively reducing the consumption of optical fiber energy in the communication transmission process and effectively improving the operation efficiency of China’s communication network.

　　Rainy days can transform the world into a serene, misty landscape or a torrential downpour that challenges daily routines. In such weather, a waterproof umbrella becomes more than just an accessory; it becomes a vital tool for comfort, convenience, and protection. This article explores the reasons why a waterproof umbrella is a must-have for every rainy day.As we all know, umbrella The emergence of the market is worthy of many people’s attention, which has aroused the waves of the whole market. https://topumbrella.cc/

　　

　　waterproof umbrella

　　

　　1. Effective Protection Against Rain

　　

　　The primary function of a waterproof umbrella is to shield you from rain. Unlike regular umbrellas that may soak through over time, waterproof umbrellas are designed with materials that repel water. This ensures that you stay dry and comfortable, whether you¨re walking to work, running errands, or simply enjoying a stroll in the rain. tu3005

　　

　　Water Repellency Levels: Water repellency levels range from Level 1 to Level 5, with Level 3 meaning the canopy surface effectively prevents penetration in moderate rain, with droplets swiftly rolling off to prevent soaking.

　　

　　RPET Eco-Friendly Material: RPET (Recycled Polyester) is an eco-friendly material made from recycled PET plastic bottles. Its production reduces energy consumption and carbon emissions, aligning with sustainable development principles.

　　

　　Aluminum Frame: Aluminum frames offer excellent strength and corrosion resistance while being lightweight, making them easy to carry. The flexibility and elasticity of aluminum make the frame resistant to deformation in strong winds.

　　

　　Fully Automatic Operation: The fully automatic umbrella features an intelligent open and close system, allowing users to operate it easily with the push of a button, greatly enhancing the user experience, especially in sudden rain.

　　

　　SGS Testing Certification: SGS is the world¨s leading inspection, verification, testing, and certification company. Passing SGS tests ensures that this umbrella meets international standards for quality and performance.

　　In an era dominated by digital technology and smart devices, the allure of mechanical watches remains as strong as ever. These intricate timepieces captivate collectors, horologists, and casual wearers alike with their blend of craftsmanship, history, and artistry. What is it about mechanical watches that continues to enchant people around the world? Let¨s delve into the timeless charm of mechanical watches and explore why they hold a special place in the hearts of many.Actually, it’s not just this reason, diving watch Its own advantages are also obvious, and it is normal for the market to perform well. https://www.supertimewatch.com/

　　

　　The Art of Craftsmanship

　　

　　mechanical watches

　　

　　At the heart of every mechanical watch lies an intricate assembly of gears, springs, and levers, meticulously crafted to measure time with precision. Unlike quartz or digital watches, which rely on batteries and electronic circuits, mechanical watches are powered by the movement of their components, often referred to as the ＾movement￣ or ＾caliber.￣

　　

　　Handcrafted Precision

　　

　　The creation of a mechanical watch involves hundreds of hours of painstaking labor by skilled artisans. Each component is crafted with precision, often by hand, and assembled into a harmonious mechanism. This level of craftsmanship is akin to art, where each watch becomes a unique masterpiece. The expertise and dedication required to create these watches make them highly valued among enthusiasts.

　　

　　Attention to Detail

　　

　　Mechanical watches are celebrated for their attention to detail. From the intricate engravings on the movement to the delicate finishing on the case, every aspect of a mechanical watch is designed with meticulous care. This dedication to detail not only enhances the watch¨s aesthetic appeal but also ensures its longevity and reliability.

　　

　　The Beauty of Engineering

　　

　　Beyond their artistic appeal, mechanical watches are marvels of engineering. The ability to measure time accurately through purely mechanical means is a testament to human ingenuity and innovation.

　　

　　Complex Movements

　　

　　Mechanical watch movements can be incredibly complex, featuring complications such as chronographs, moon phases, and perpetual calendars. These complications add to the watch¨s functionality and demonstrate the watchmaker¨s skill in creating intricate mechanisms. The smooth sweep of a mechanical second hand, for instance, is a visual representation of the intricate ballet of gears and springs working in perfect harmony.

　　

　　Mechanical Precision

　　

　　The precision of a mechanical watch is achieved through the regulation of its escapement mechanism, which controls the release of energy from the mainspring. This process, refined over centuries, ensures that mechanical watches can keep time with remarkable accuracy. The engineering prowess required to achieve such precision is part of the watch¨s charm.

　　

　　A Connection to History

　　

　　Mechanical watches carry with them a rich history and heritage. They are symbols of a bygone era, where timekeeping was an art and a science. Wearing a mechanical watch is like wearing a piece of history on your wrist.

　　

　　Historical Significance

　　

　　Many mechanical watch brands have storied histories, dating back centuries. Brands like Patek Philippe, Rolex, and Audemars Piguet have been at the forefront of watchmaking innovation, producing iconic timepieces that have stood the test of time. Each mechanical watch often comes with a story, whether it¨s a groundbreaking innovation or a famous owner.

　　

　　Vintage Appeal

　　

　　Vintage mechanical watches are highly sought after for their historical significance and unique character. These watches often feature designs and complications that are no longer produced, making them rare and valuable. Collecting vintage watches is a way to preserve and celebrate the history of horology.

　　As electric vehicles (EVs) continue to gain popularity, the demand for reliable and efficient charging solutions is on the rise. The Yilade electric car charging station is one such solution that has been designed to accommodate a wide range of electric vehicles, making it an excellent choice for both personal and commercial use. In this article, we¨ll explore the types of electric vehicles compatible with the Yilade charging station, ensuring that you can make an informed decision when choosing your EV charging infrastructure.As we all know, Yilade electric car charging stations The emergence of the market is worthy of many people’s attention, which has aroused the waves of the whole market. https://www.evyilade.com/

　　

　　Compatibility with Different Connector Types

　　

　　One of the standout features of the Yilade charging station is its compatibility with various connector types. The station supports both Type 1 (SAE J1772) and Type 2 (IEC 62196) connectors, which are the most common charging standards used by electric vehicles worldwide. This means that whether you own a vehicle with a Type 1 connector, such as a Nissan Leaf, or a Type 2 connector, like a BMW i3, the Yilade charging station can efficiently charge your vehicle.

　　

　　European Standards 1 Phase Current Switching 32A AC EV Charger Type2 Wallbox 7KW Electric Car EV Charging Station

　　

　　Support for Popular Electric Vehicle Brands

　　

　　The Yilade charging station is designed to be compatible with a wide range of electric vehicle brands, ensuring that you can charge your car regardless of the manufacturer. Some of the popular EV brands compatible with the Yilade charging station include:

　　

　　Tesla: Tesla vehicles, such as the Model S, Model 3, Model X, and Model Y, can be charged using the Yilade charging station with the appropriate adapter.

　　

　　Nissan: The Nissan Leaf, one of the best-selling electric cars globally, is fully compatible with the Yilade charging station, allowing for efficient and reliable charging.

　　

　　BMW: The BMW i3 and i8, known for their innovative design and performance, can easily be charged using the Yilade charging station.

　　

　　Chevrolet: The Chevrolet Bolt, another popular electric vehicle, can also be charged at a Yilade station, providing flexibility and convenience for Chevy owners.

　　

　　Audi: The Audi e-tron series, known for its luxury and performance, is fully supported by the Yilade charging station.

　　

　　Fast and Efficient Charging

　　

　　The Yilade charging station is equipped with high-power outputs, making it suitable for charging a variety of EVs at different speeds. Depending on your vehicle¨s battery capacity and charging rate, the Yilade station can provide fast charging, reducing the time it takes to get your EV back on the road. For example, a vehicle with a 40 kWh battery can be charged from 20% to 80% in just a few hours, making it an ideal solution for both home and commercial use.

　　

　　European Standards 1 Phase Current Switching 32A AC EV Charger Type2 Wallbox 7KW Electric Car EV Charging Station

　　

　　Compatibility with Future Electric Vehicles

　　

　　As the electric vehicle market continues to evolve, the Yilade charging station is designed to stay ahead of the curve. With its robust and future-proof design, it can accommodate the latest advancements in EV technology, ensuring that new models from various manufacturers will remain compatible. This future readiness makes the Yilade charging station a wise investment for those looking to stay prepared for the ongoing growth of electric vehicles.

　　

　　Conclusion

　　

　　In summary, the Yilade electric car charging station is compatible with a wide range of electric vehicles, including popular brands like Tesla, Nissan, BMW, Chevrolet, and Audi. Its support for both Type 1 and Type 2 connectors, coupled with its fast charging capabilities, makes it a versatile and efficient charging solution for any EV owner. Whether you are charging your car at home or setting up a commercial charging station, the Yilade charging station provides the reliability and compatibility you need to keep your vehicle charged and ready to go.

　　

　　For more details on the Yilade electric car charging station and its compatibility with different electric vehicles, you can visit their official website: Yilade EV Charging Solutions.

　　In today’s fast-paced world, having a reliable source of power during emergencies is essential. Portable power stations have emerged as the go-to solution for ensuring you stay connected and powered up, no matter the circumstances. Here’s why a portable power station is the ideal emergency power supply unit.in fact 1000W portable power station Our related products were once praised by users, which is the best self-affirmation of the products. https://www.packsico.com/

　　

　　1. Versatility and Portability

　　

　　One of the standout features of portable power stations is their versatility. These compact units can power a wide range of devices, from smartphones and laptops to medical equipment and home appliances. Their lightweight and compact design make them easy to transport, allowing you to carry them wherever you go. Whether you¨re at home, in your car, or camping in the wilderness, a portable power station ensures you have access to power when you need it most.

　　

　　2. Ease of Use

　　

　　Portable power stations are designed with user-friendliness in mind. They come with simple interfaces, making them easy to operate even for those who are not tech-savvy. Most models feature multiple outlets and USB ports, allowing you to charge and run several devices simultaneously. Additionally, many portable power stations come with solar panel compatibility, providing an eco-friendly option for recharging the unit.

　　

　　3. Reliable Power Source

　　

　　During emergencies, having a reliable power source is crucial. Portable power stations are equipped with high-capacity batteries that provide long-lasting power. They are designed to maintain a steady power supply, ensuring your devices stay charged for extended periods. This reliability is particularly important during natural disasters or power outages when traditional power sources may be unavailable.

　　

　　4. Environmentally Friendly

　　

　　Traditional generators often rely on fossil fuels, which can be harmful to the environment. Portable power stations, on the other hand, are typically powered by lithium-ion batteries and can be recharged using solar panels. This makes them a more environmentally friendly option. By using a portable power station, you can reduce your carbon footprint while still ensuring you have the power you need during emergencies.

　　

　　5. Quiet Operation

　　

　　Unlike noisy generators, portable power stations operate quietly. This is particularly advantageous during emergencies when maintaining a calm and quiet environment is important. The quiet operation of portable power stations ensures that you can use them indoors without causing disturbance, making them suitable for a variety of settings, including homes, offices, and healthcare facilities.

　　

　　6. Cost-Effective

　　

　　While the initial investment in a portable power station may be higher than some other emergency power solutions, they are more cost-effective in the long run. They require minimal maintenance and do not incur ongoing fuel costs like traditional generators. Additionally, the ability to recharge using solar panels can further reduce operational costs, making portable power stations a smart financial investment for emergency preparedness.

　　

　　Conclusion

　　

　　In conclusion, a portable power station stands out as the ideal emergency power supply unit due to its versatility, ease of use, reliability, environmental friendliness, quiet operation, and cost-effectiveness. By investing in a portable power station, you can ensure that you and your loved ones stay connected and powered up during emergencies, providing peace of mind and security in uncertain times.

　　High-frequency industrial reader works in 13.56MHz band, which can directly pass through most nonmetallic materials (such as wood, paper, etc.) and is suitable for various environments.From some points of view, rfid module supplier It is the core driving force to better promote the rapid development of the surrounding markets. https://www.vanchrfid.com/

　　

　　Working principle of high frequency integrated reader

　　

　　The integrated reader integrates the reader-writer module and the reader-writer antenna, and uses the transmission characteristics of inductive or electromagnetic coupling to transmit energy through the inductive coupling of antenna coils, thus realizing automatic identification of the recognized object.

　　

　　Characteristics of integrated reader-writer

　　

　　1. Compact design

　　

　　Integrated RFID reader integrates all components into a single shell, so it is usually more compact. This design makes the installation easier, especially suitable for the environment with limited space.

　　

　　2. Simple deployment

　　

　　Because all components are in one device, the deployment of industrial integrated RFID reader is usually relatively simple. Users only need to deal with one device, which reduces the complexity of installation and configuration.

　　

　　3, easy to maintain

　　

　　One-piece structure usually makes maintenance easier. Because all components are in one device, troubleshooting and maintenance are usually more intuitive and easy to carry out.

　　

　　Different applications of different types of industrial readers

　　

　　The integrated industrial reader can be used in industrial production lines, reading and recording all kinds of information of production line equipment, and realizing automatic control and monitoring; It can also be used in warehouse management, such as warehouse entry and exit management, inventory counting, etc. At the same time, it can also be used to manage tools and molds in industrial production lines, and track and manage the status and use of tools in real time. Different scenarios have different requirements for the performance and size of the reader. The following are several typical field applications of the reader.

　　

　　Industrial RFID reader

　　

　　1. Strip integrated reader/writer

　　

　　The high-frequency medium-power strip industrial read head AR2201X adopts the medium-power strip read head of Modbus communication protocol. Based on the stable medium-power HF radio frequency module, it has high and stable reading and writing performance, and the working frequency band is 13.56MHz, which supports the reading of NXP I-CODE 2, I-CODE SLI and other labels conforming to the ISO15693 international standard protocol format.

　　

　　The long strip reader can be installed and used in industrial fields such as production line and automatic sorting system, for example, the long strip reader is installed above or on the side of the production line, and the label is fixed on the product tray or on the product. When the product/tray enters the reading and writing range, the industrial RFID reader will automatically read the tag data and then feed back the information to the RFID production line management system. Make the industrial production process management more information-based, transparent, and the data more accurate, and reduce the production cost while ensuring the quality of products.

　　

　　2. Wall-mounted integrated reader

　　

　　AR1301X, a high-frequency micro-power industrial reader, is an industrial-grade RFID micro-power wall-mounted reader using Modbus communication protocol. Based on the development of micro-power RF module, it adopts the integrated design of reader and antenna, and its working frequency band is 13.56MHz, which supports the reading of NXP I-CODE 2, I-CODE SLI and other labels conforming to ISO15693 international standard protocol format.

　　

　　Wall-mounted readers are usually used in industrial fields such as warehouse logistics, parts assembly production line, etc. Generally, the wall-mounted readers are installed on the station site, and the labels are installed on the tooling board of the shuttle bus. Through RFID acquisition technology, the unmanned automatic real-time identification of material handling information is completed, and the rapid acquisition of warehouse logistics information is completed by using RFID accurately and quickly.

　　

　　3. Thread integrated reader/writer

　　

　　AR1431X, a high-frequency micro-power integrated thread reader, supports the Modbus communication protocol as an industrial reader, with a working frequency band of 13.56MHz, and supports the reading of NXP I-CODE 2, I-CODE SLI and other labels conforming to the ISO15693 international standard protocol format.

　　

　　Thread reader is smaller, and it is often used in industrial fields such as tool management and die life management. It can be fixed to the use position by using two nuts that come with the product. You can also rely on the thread of the product to directly screw into the installation position (you can choose to install it flush or not according to the field environment or reading distance), identify the use times of tools/molds, and improve the efficiency of asset management.

　　What does optical fiber mean? Optical fiber is a kind of slender flexible glass or plastic fiber used to transmit optical signals, which is usually used to transmit high-speed data and communication signals over a long distance. The core of optical fiber is surrounded by materials with high refractive index and covered by materials with low refractive index. This design allows light to propagate inside the core with almost no optical loss, so that optical signals can be transmitted over a long distance without obvious signal attenuation. Optical fiber has become one of the most important technologies in modern communication field, which is widely used in telephone, Internet, television and computer network.So, fiber optic patch cord On the contrary, there is still a lot of room to play. https://www.fibercan-network.com/

　　

　　In optical fiber, optical signal is converted into optical pulse and propagates along the core, which enables the signal to be transmitted over a long distance without obvious signal attenuation. Here are some basics of getting started with optical fiber:

　　

　　Optical fiber structure: Optical fiber is mainly composed of core, cladding and sheath. The core is the core of optical signal transmission, usually made of glass or plastic with high refractive index. The cladding is surrounded by low refractive index material to protect and guide light, and the sheath is used to protect the optical fiber and enhance its strength.

　　

　　Working principle of optical fiber: When light enters from a medium with high refractive index into a medium with low refractive index, the light will be totally reflected. The refractive index of the core material of optical fiber is higher than that of the cladding material, which makes the light can be totally reflected in the core for many times, thus realizing signal transmission.

　　

　　Optical fiber type: Common optical fiber types include single-mode optical fiber and multimode optical fiber. Single-mode fiber has small core diameter and high refractive index, which is suitable for long-distance and high-speed transmission. The core diameter of multimode fiber is large, which is suitable for short-distance transmission.

　　

　　Optical fiber application: Optical fiber has become one of the most important technologies in modern communication field, which is widely used in telephone, Internet, television and computer network. It is also widely used in medical, military, aerospace and scientific research fields.

　　

　　Advantages of optical fiber: Compared with traditional copper cable, optical fiber has higher bandwidth, lower signal attenuation and smaller signal delay. In addition, the signal of optical fiber is not easy to be eavesdropped or interfered, so it has higher security.

　　Currently, there are three types of sea freight services: Meisen Express, Yixing Express, and Evergreen Express (Yantian EMC scheduled cross-border e-commerce sea freight route). However, with the development of the industry, freight forwarder china to usa It will also bring us more and more consumer experiences, so that users can really feel the upgrade and change. https://www.freeseaship.com/

　　

　　Yantian EMC scheduled route is similar to Meisen and Yixing Express in terms of stability, but it also offers slower shipping options (referred to as slow boats). It is important to differentiate between the HTW and TPS routes, as they are the scheduled express options.

　　

　　Meisen Express Sea Freight with Tax Included:

　　

　　For those who choose Meisen Express, the logistics are based in Guangdong, Fujian, Zhejiang, or Shanghai. The ship departs from Shanghai and goes directly to Long Beach, USA. Meisen Express claims to be the fastest shipping option from China to the USA, with an estimated arrival time of 8-10 working days after departure. They have their own independent port, ensuring smooth customs clearance, and containers can be delivered the next day. UPS or FedEx will then deliver the goods to the designated FBA warehouse. Meisen Express is well-known for its fast delivery.

　　

　　Yixing Express Sea Freight with Tax Included:

　　

　　Yixing Express is located in Shenzhen, Guangdong, and the ship departs from Yantian Port directly to Los Angeles, USA. It is considered one of the most competitive options in the southern region and a strong competitor to Meisen Express. Yixing Express has a shipping schedule of six days on and three days off, with an estimated arrival time of 9-10 working days after departure. The overall delivery time and price are similar to Meisen Express.

　　

　　Yantian Express Sea Freight with Tax Included:

　　

　　Yantian EMC Evergreen Express is a scheduled sea freight service that departs from Yantian, Shenzhen. It operates on a four days on and three days off schedule, with an estimated delivery time of 13-15 working days after departure. Compared to the express options, it is slower by approximately 5 working days, but the price is more affordable, with a difference of around 1 RMB per kilogram. For those who do not have strict time requirements, Yantian Express can be a cost-effective option.

　　SISHUN TOPUMBRELLA has successfully obtained ISO 9001 and ISO 14001 certifications,So, umbrella On the contrary, there is still a lot of room to play. https://topumbrella.cc/

　　

　　marking our continued commitment to quality and environmental responsibility. These

　　

　　certifications are a testament to our unwavering dedication to delivering exceptional

　　

　　products while prioritizing sustainability in every step of our production process.

　　

　　ISO 9001 reflects our dedication to maintaining the highest standards of quality

　　

　　management, ensuring that our products not only meet but also exceed our customers¨

　　

　　expectations. This achievement underscores our relentless pursuit of excellence and our

　　

　　ongoing efforts to enhance customer satisfaction through innovation and continuous improvement.

　　

　　ISO 14001 certification reinforces our pledge to environmentally responsible practices,

　　

　　from sustainable sourcing of materials to reducing our carbon footprint throughout the

　　

　　manufacturing process. At SISHUN TOOUMBRELLA, we are committed to leading by

　　

　　example in the industry, ensuring that our operations contribute positively to the environment

　　

　　while providing high-quality products to our global customers.

　　Here we will introduce some basic knowledge about traditional watches.In today’s market background, mechanical watch Still maintain a strong sales data, and constantly beat the competitors in front of us. https://www.supertimewatch.com/

　　

　　watch basics

　　

　　1. Watch styles and functions

　　

　　Watch styles and functions. Watches are divided into two categories: mechanical and quartz. The most common mechanical watch has an automatic calendar function.

　　

　　2. Quartz watch vs. mechanical watch

　　

　　Which is better, a quartz watch or a mechanical watch? They both have their pros and cons, regardless of value. Quartz watches can be expensive, while mechanical watches can be cheap. Generally speaking, mechanical watches are more ornamental, while quartz watches are more accurate and easy to use. There are three ways to distinguish them.

　　

　　(1) Look at the logo. Automatic watches will have the letters AUTOMATIC or SELF-WINDING.

　　

　　(2) Look at the movement of the second hand. A quartz watch jumps one second at a time, while a mechanical watch has the second hand continuously moving across the dial.

　　

　　(3) Check whether it can be wound or whether there is a sound of the automatic rotor spinning.

　　

　　3. The indication function of the watch

　　

　　The hands and dial are used to indicate the time, and there are also windows with numbers. The window type is mostly used for calendars. The so-called “big calendar” has two windows, which display the tens and the digits of the date respectively.

　　

　　4. The flyback and retrograde forms of the watch hands

　　

　　They do not rotate in a clockwise circle. The flyback is the characteristic of the chronograph returning to zero, while the retrograde is when the hands move in a “fan shape”. The retrograde movement in a fan shape is rather strange, as it automatically returns to zero after completing the full range.

　　

　　5. Chronograph watch

　　

　　Commonly known as “three needles and three eyes”, it also has three crowns. 1. Most of the chronograph stopwatches currently use a double-button type, with the two buttons usually at 2 and 4 o’clock. The 2 o’clock button controls the “start and stop” function, and the 4 o’clock button controls the “reset” function. 2. The operation method used is usually the process of “start—stop—-reset” or “start—stop—-start—stop—reset”. The stopwatch function must be stopped before pressing the reset button. 3. The single-button stopwatch is relatively simple, with one button controlling the “start—stop—-reset” function. Please note that after each button is pressed, it must be reset before it can be pressed a second time.

　　

　　6. Moon phase display

　　

　　The moon phase is actually a lunar calendar, indicating the cycle of the moon’s waxing and waning. The sun, moon and stars are the most intuitive celestial bodies, but the moon phase is related to latitude. Design principle: The moon phase function is often placed in a semicircular window of a special shape, which includes a semicircular arc and two small arcs. This carefully designed shape combined with the moon on the moon phase disk can accurately tell us the shape of the moon at the beginning or end of a cycle. Operation principle: The moon phase displays the state of the moon on the moon phase disk based on a 29.5-day cycle. There are two moons on this moon phase disk, with 59 teeth on the edge. After being pushed by the transmission wheel, the moon phase wheel advances one tooth every day, and the changes in the moon phase can be displayed on the dial in time. The 59-tooth moon phase wheel comes from the average value of the moon phase waxing and waning every 29.5 days. Since the precise rotation period of the moon is 28 days, 12 hours, 44 minutes and 2.9 seconds, the error of the moon phase display will reach 24 hours every approximately 33 months. There is usually a moon phase adjustment button on the watch case, and the moon phase display is relatively independent of functions such as chronograph and perpetual calendar.