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581—G型光电比色计是用于有色溶液浓度测定的普及型仪器,在中等卫生学校生化实验中用得较多。笔者在多年的教学与工作中,发现该仪器的二种常见故障可以通过电路改装来加以避免。它们是:①1.5V千电池失效引起的光点调不到零位;②6.3V电光源损坏引起的标尺上光点消失。 1.5V干电池装在仪器背面的干电池盒内,由线路图(图1)可知,它是供调零电路调
581-G-type photoelectric colorimeter is a universal instrument for the determination of the concentration of colored solutions, used more often in biochemical experiments in secondary health schools. In many years of teaching and work, I found that the two common failures of the instrument can be avoided by circuit modification. They are: ① 1.5V thousand batteries caused by the failure of light points transferred to zero; ② 6.3V light source caused by damage to the ruler on the spot disappears. 1.5V dry battery installed in the back of the instrument dry battery box, from the circuit diagram (Figure 1) shows that it is for zero circuit adjustment