Frequency-modulated series resonance withstand voltage test set transformer external test Note:

1. The tested windings and non-tested windings should be short-circuited, with the non-tested windings also being shorted and grounded. It is essential that the test specimen does not have any floating potentials, as this could lead to inaccurate readings or even damage during the test. 2. During the test, the connection between the inverter resonant system and the transformer casing under test must be made using the specialized grounding wire provided by our company. This ensures a safe and reliable electrical path, minimizing the risk of interference or unexpected voltage spikes. The principle behind the transformer induction withstand voltage test is to evaluate both the main insulation and the longitudinal insulation of the transformer simultaneously. This test is critical for ensuring the long-term reliability and performance of the equipment. The test voltage is typically set at twice the rated voltage of the transformer. However, to prevent core saturation, the test frequency must be higher than twice the rated frequency. Usually, the test frequency ranges from 100 Hz to 400 Hz. Based on practical experience, the optimal frequency range for the test is generally between 150 Hz and 200 Hz. This helps maintain a stable magnetic field and ensures accurate test results. Additionally, it is important to ensure that all connections are secure and properly insulated before starting the test. The test environment should be clean and free from any external electromagnetic interference. Operators should also be trained and familiar with the testing procedures and safety protocols to avoid accidents. Regular maintenance of the test equipment is equally important to guarantee consistent and reliable performance.

868MHZ Antenna

The utility model presented herein introduces an innovative PCB antenna specifically designed for the 868MHz frequency band, catering to the needs of various communication systems operating within this range. This sophisticated design encapsulates a PCB substrate, upon which are meticulously arranged key components that synergize to enhance antenna performance and efficiency.

At the heart of this antenna lies a first PCB antenna, intricately etched or deposited onto the PCB substrate. This primary antenna serves as the foundation for receiving and transmitting radio signals within the 868MHz band. To complement its functionality, a ground plane is incorporated, providing a stable reference point for the antenna's operation and minimizing interference.

Innovatively, an L-shaped second PCB antenna is strategically positioned between the first PCB antenna and the ground plane. This unique configuration not only adds to the antenna's structural complexity but also significantly enhances its performance characteristics. The end portion of this L-shaped antenna features a precisely located feed point, which serves as the interface for coupling the antenna to the transmission line or circuitry, ensuring efficient energy transfer.

Furthermore, the ground surface of the PCB substrate is thoughtfully designed with a ground wire that extends from the outer edge of the substrate to its surface. This ground wire facilitates the establishment of a low-impedance path for return currents, further minimizing signal loss and enhancing overall antenna efficiency. Notably, the core wire of this ground wire and the feed point undergo a tinning process, a technique that enhances their conductivity and durability, thereby optimizing signal transmission and reception.

The cumulative effect of these design elements results in a PCB antenna that not only improves efficiency but also optimizes performance across various parameters such as gain, bandwidth, and radiation pattern. This innovative design is particularly suited for applications requiring reliable and efficient communication within the 868MHz frequency band, including IoT devices, smart metering systems, and various other wireless communication networks.

In summary, the disclosed utility model represents a significant advancement in PCB antenna technology, offering a compact, efficient, and high-performance solution tailored for the 868MHz frequency band. Its innovative design and attention to detail make it an ideal choice for a wide range of communication systems, ensuring reliable and seamless connectivity in today's increasingly interconnected world.

868MHZ Rubber Antenna,868MHZ Antenna with magnetic base,868MHZ Fiberglass antenna

Yetnorson Antenna Co., Ltd. , https://www.yetnorson.com