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我们根据本刊一九七四年第四期介绍的“直角尺检定仪”一文的原理,自制了一台简易直角尺检定仪,经使用效果较好。但因该仪器的显示装置只设置一只欧姆表,所以只有当两测量圆柱同时接触被检直角尺的长工作面时,才能形成回路,由欧姆表的指针偏转显示出来。但当直角尺只与一测量圆柱接触时,欧姆表指针不动,因此仍需借助肉眼来判明哪个测量圆柱没有接触被检尺,以便调整测臂,可见还是不够方便,我们将原电路稍加改动,并增加一只欧姆表,便之构成两个回路,用起来就比较方便了(参看示意图)。这样,由两只欧姆表分别指示出两测量圆柱与
Based on the principle of “rectangular ruler” introduced in the fourth edition of 1974, we have made a simple rectangular ruler with good effect. However, only one ohmmeter is provided in the display device of the instrument. Therefore, the loop can be formed only when the two measuring cylinders touch the long working face of the square to be inspected at the same time, and the indicator is deflected by the ohmmeter. However, when the square and only a measuring cylinder contact, the ohmmeter pointer does not move, so still need to use the naked eye to determine which measuring cylinder is not in contact with the test ruler in order to adjust the arm, we can see is not convenient enough, we will slightly change the original circuit , And add an ohmmeter, it will form two loops, it is more convenient to use (see diagram). In this way, two ohm meters indicate the two cylinders