现代电子设备，如数字数据通信设备、数控装置、近代仪器仪表装置，特别是程控交换机无不采用数字集成电路，以数字形式来处理信息。数字电路的故障排除已成为一项重要的维修工作。 数字电路的维修大体分为两个阶段。第一阶段，通过简单的操作确定发生故障的设备和部分，对诸如 Modern electronic equipment, such as digital data communications equipment, numerical control devices, modern instrumentation devices, especially program-controlled switches all use digital integrated circuits to process information in digital form. Troubleshooting digital circuits has become an important repair job. Digital circuit maintenance can be divided into two stages. The first phase, through simple operation to determine the failure of the equipment and parts, such as