Chinese
Digital pressure gauges, also known as digital manometers, comply with the standard **JJG857-2005 Verification Regulation for Digital Pressure Gauges**. Their main features include battery power supply and pressure measurement display.
The working principle of a digital pressure gauge can be divided into four main sections:
1. **Power Supply Unit:**
This unit is primarily powered by batteries, which can be standard AA batteries, disposable lithium batteries, or rechargeable lithium batteries. The choice of battery depends on the housing design or specific application requirements. The battery voltage is converted to the level required by the circuit to power the entire system.
2. **Central Processing Unit (CPU):**
The CPU includes a microprocessor and memory. The microprocessor handles various parameter settings, performs calculations, sends data to the LCD for display, and stores necessary data in the memory.
3. **Data Acquisition Unit:**
This unit consists of an Analog-to-Digital (AD) converter and the sensor component. The sensor itself comprises an excitation circuit and the sensing element. The analog signal from the sensor is excited, converting it into an electrical signal. This electrical signal is then fed into the AD conversion circuit, where the AD chip converts it into digital data sent to the microprocessor.
4. **Peripheral Unit:**
The peripheral unit mainly includes three parts: the LCD display, keyboard, and communication interface. Whether these components are incorporated depends on customer requirements and the product design specifications.