我单位研制的数字式杂音、电平表是由Z-80CPU控制的全自动常用型电讯测试仪表,其部分特性指标如表1: 数字式杂音、电平表在设计上不同于传统电讯测试仪表的设计方法。微处理机的应用,不但实现了测试过程的全部自动化,而且仪表本身可以进行自校验。测试时,CPU自动减去仪表本身的误差,使测试精度比较准确。在硬件方面,仪表对元器件和制作工艺都没有过高的要求。因为由元器件和制作工艺方面所带来 I developed by the unit of digital noise, level meter is controlled by the Z-80CPU automatic telecommunications tester, some of its performance indicators such as Table 1: Digital noise meter is designed to be different from traditional telecommunications test instruments Design method. Microprocessor applications, not only to achieve the full automation of the testing process, but the instrument itself can be self-checking. Test, the CPU automatically subtracts the error of the instrument itself, so that the accuracy of the test more accurate. In the hardware, the instrument on the components and production processes are not too high requirements. Because of the components and production process brought