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1 CAT系统组成由第一讲所述3个CAT系统。可抽象出CAT系统的典型框图,如图1所示。CAT系统主要由硬信息输入、硬信息输出、软信息输入和软信息输出这4子系统组成。1.1 硬信息输入子系统其任务是将测试对象参数P输入CPU。P一般为非电模拟量,而一般CPU只接受电数字量,因此需要进行转换。P/A即传感器,将非电模拟量转换为电模拟量。A/A为电模拟信号变换装置,包括采佯、保持、放大、滤波、解调等。A/D则为模/数转换装置,将电模拟量转换为电数字量。由于速度、相位、电平等差异,电数字信号需经接
1 CAT system consists of three CAT system described in the first. A typical block diagram of a CAT system can be abstracted, as shown in Figure 1. CAT system mainly consists of hard information input, hard information output, soft information input and soft information output 4 subsystems. 1.1 hard information input subsystem Its task is to test object parameters P input CPU. P is generally a non-electrical analog, and the general CPU only accepts electrical digital, so the need for conversion. P / A is a sensor that converts non-electrical analog to electrical analog. A / A is an electrical analog signal conversion device, including sampling, holding, amplification, filtering, demodulation and so on. A / D is an analog / digital conversion device, the electrical analog to digital conversion. Due to the speed, phase, level and other differences, the electrical digital signal to be connected