ＷＺＺ—２型自动旋光仪在使用中，有时出现尾数两位数字跳字跳动，有时很容易烧Ｎａ灯泡，我院曾在一个月内烧坏６只Ｎａ灯泡，该厂没有给电路图，因此，我根据印刷电路图（如图１），这是一个串联稳压电源．（虚线连接的部分是改动添加部分）即没有取样，也没有保护电路．Ｔ In the use of the WZZ-2 automatic polarimeter, there are occasional two-digit digital jumps in the mantissa. It is sometimes very easy to burn Na bulbs. Our hospital burned six Na bulbs within a month. The factory did not give circuit diagrams. Therefore, I according to the printed circuit diagram (Figure 1), this is a series regulated power supply. (The part connected by the dotted line is the modification addition part) ie no sampling and no protection circuit. T