Early weighing indicators were of the analog-indicating type, comprising components such as an error amplifier, reversible motor, balancing bridge, excitation power supply, dial, and pointer; they operated on the principle of the self-balancing electronic potentiometer. Characterized by slow weighing speeds, limited functionality, and low accuracy, these devices have now been largely phased out.
With technological advancements, modern digital weighing indicators have become increasingly widespread. Concurrently, technologies in key application areas-such as electronic truck scales-have evolved from analog to digital and from static to dynamic operation; China's capabilities in this field have reached a world-class level.
On June 1, 2024, the new standard GB/T 7724-2023, *Electronic Weighing Instruments*, officially came into effect. To accommodate the development of new technologies such as the Internet of Things (IoT) and digital instrumentation, this standard establishes new requirements regarding instrument error, structural design, and anti-interference performance.
Intellectual property protection has also gained importance as the industry has developed.