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小型数字电压表的发展,对电路的设计提出越来越高的要求。这些要求可概括为:电路简单、性能好、坚固耐用、成本低、便于大量生产等。本文仪对积分比较式小型数字电压表的启动同步系统加以分析和讨论。一、目前使用的一种简易启动同步电路启动同步电路是数字电压表的指挥控制系统。其作用主要是:发出测量开始的命令-t_1指令,使数字电压表进入自动工作状态;测量结束,计数门关闭,发出传输指令,以便将计数器中计得的数传输给寄存器译码显示;最后发出清“0”和预置指令,为下一次测量作好准备。启动同步电路应保证数字系统读数稳定,不产生附加误差(量化误差除外)。图1(a)所示电路,是积分比较式小型数字电压表
The development of small digital voltmeter, the design of the circuit put forward higher and higher requirements. These requirements can be summarized as: circuit is simple, good performance, durable, low cost, ease of mass production. This article on the integral comparison of small digital voltmeter start synchronization system to be analyzed and discussed. First, the current use of a simple start synchronization circuit to start the synchronization circuit is the digital voltmeter command and control system. Its main function is: issue the command of measurement -t_1 command to make the digital voltmeter enter the automatic working state; after the measurement is finished, the counting gate is closed and a transmission instruction is sent, so that the counted number in the counter is transmitted to the register to be decoded and displayed; finally Clear “0” and preset instructions to prepare for the next measurement. Start the synchronization circuit should ensure that the digital system readings stable, no additional error (except for quantization error). Figure 1 (a) shows the circuit, is an integral comparison of small digital voltmeter