Analysis of actual circuit principle of load cell

A load cell is a device that converts mechanical force or weight into an electrical signal that can be measured and processed. When selecting a load cell, it's crucial to consider the actual working environment in which it will be used. This factor significantly influences the sensor's performance, safety, longevity, and the overall reliability of the weighing system. There are differences between old and new national standards in terms of the evaluation methods for the main technical parameters of load cells. Common types include S-shaped, cantilever, spoke, plate ring, bellows, bridge, and column configurations. Load cells used in electronic scales often feature tension and compression sensors, which offer higher accuracy, lower cost, and greater durability compared to traditional pressure sensors. This makes them ideal for various industrial applications such as batching and force measurement. Electronic scales provide precise measurements, high resolution, and are less prone to damage, making them a cost-effective solution. The circuit diagram of an electronic scale includes key components like the MC14433 A/D converter, 4511 LED display driver, 1413 for digit selection, and 1403 for providing a stable reference voltage. The 7650 is a chopper-stabilized operational amplifier that amplifies the sensor's output voltage. The sensor used is a BLR-type tension and compression sensor, with RA, RB, RC, and RD representing strain resistors within the device. The voltage regulator 7805 supplies 5V to the entire system, operating normally with an input voltage ranging from 8V to 15V. It can also be powered through AC 220V after rectification and filtering. Since the instrument is designed for high-precision applications, the peripheral resistors for MC14433, 1403, and 7650 should have low temperature coefficients and excellent thermal stability. It is recommended to use RJ metal film resistors. The resistance value of the 7650 should differ by less than 1% from the resistances of RE and RF; otherwise, the scale may not zero correctly. The values of RE and RF typically range from tens of kiloohms to hundreds of kiloohms, depending on the sensor's capacity. For smaller sensors, such as those rated at 200kg, the resistance should be lower, while larger sensors, like 2000kg, require higher resistance values. If a decimal point is used, the corresponding resistor is connected to V+. For sensors below 200kg, the first decimal point is activated on the right side. Between 200kg and 2000kg, the decimal point remains off, ensuring a minimum resolution of 1kg.

Indoor Access Point

An Indoor Access Point is a device for wireless local area networks (WLAN) that provides wireless network coverage and connectivity. It can connect to a wired network and transmit data via a wireless signal, allowing users to connect to the network wirelessly within coverage.

Indoor access points come in a variety of different types and specifications to suit different scenarios and needs. Here are some common types of indoor access points:

1. Single Band Access Point: A single band access point operates in the 2.4GHz band and typically provides a maximum transfer rate of 300Mbps. This type of access point is suitable for small office or home networks because the 2.4GHz band has better penetration and coverage, but a relatively low transfer rate.

2. Dual Band Access Point: The dual band access point supports both 2.4GHz and 5GHz bands, providing higher transmission rates and better performance. The 5GHz band has more interference free channels than the 2.4GHz band, which can provide faster speeds and more stable connections. Dual-frequency access points are suitable for medium sized offices, malls or hotels.

3. Lightweight Access Point: A lightweight access point is a wireless network device that needs to be used with a network controller. Lightweight access points do not have independent management functions themselves, but are centrally managed and configured via a network controller. This type of access point is suitable for large enterprises or organizations to enable centralized management and monitoring of the entire network.

4. Standalone Access Point: A standalone access point is a standalone device that has its own management and configuration functions and does not require additional network controllers. This type of access point is suitable for small businesses or individual users and can provide a simple and easy-to-use wireless networking solution.

5. Scalable Access Point: A scalable access point is a device that can scale on demand, increasing or decreasing the number of access points based on network demand. This type of access point is suitable for places that require flexible scaling, such as large office buildings, schools, or hospitals.

In addition to the types listed above, there are some special purpose indoor access points, such as:

1. Wall-mounted Access Point: A wall-mounted access point can be plugged directly into a Wall power outlet without the need for an additional power cord. This type of access point is suitable for home networks or small offices and can provide easy installation and use.

2. Integrated Antenna Access Point: The antenna of the antenna access point is integrated into the device, and no additional antenna installation is required. This type of access point is suitable for sites that require simple installation and a nice look.

3. Multiple Antenna Access Point: Multiple antenna access points can achieve better signal coverage and performance through multiple antennas. This type of access point is suitable for large venues or high-density user environments, such as conference rooms, stadiums or airports.

To sum up, there are many different types and specifications of indoor access points, which can be selected according to different scenarios and needs. Whether it's a small office, home network or a large enterprise, you can achieve convenient wireless network coverage and connectivity through indoor access points.

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