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为了既提高产品的性能,又不过多地增加产品的成本,在仪表中,除采用数显表头外,再加上一个自动换档电路是一种简单可行的办法。图1为一种实用的自动换档电路,此电路已在一些仪表中得到应用,几年来运行效果良好。在此电路中,采用量程为2 V的31/2位数显表头。输入信号I_(in)是最大为19.99mA的直流电流。当I_(in)从19.99 mA下降时,数显表头显示从1999开始下降,降到130左右时退到低档位,显示变为
In order to not only improve the performance of the product, but also increase the cost of the product too much, in the instrument, in addition to using digital display header, plus an automatic shift circuit is a simple and feasible way. Figure 1 is a practical automatic shift circuit, this circuit has been applied in some instruments, running well in recent years. In this circuit, using the range of 2 V 31/2 digital display header. The input signal I_ (in) is the maximum DC current of 19.99mA. When I_ (in) drops from 19.99 mA, the digital display shows the descent from 1999, when it drops to about 130, the display returns to the low level