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在缺少直角尺标准器的情况下,可用三尺互析法检定宽座角尺的外角,检定方法如下。首先将三支规格相同的宽座角尺编上顺序号。如图所示,将角尺A与角尺B置于平板1上,角尺A下放两块名义值相等的量块2,角尺B下放两组名义值接近于量块2的量块3、4。观察二支角尺长尺贴合处的间隙,反复更换量块3或4,直至长尺贴合处的间隙均匀,记下量块3与4的名义值之差Δ_1;
In the absence of rectangular scale standard case, the available three feet reciprocal analysis of wide angle square outer corner, test methods are as follows. First of all, the same specifications of three wide-angle seat on the serial number. As shown in the figure, the square A and the square B are placed on the flat plate 1. The square A is lowered by two pieces of measuring block 2 of equal nominal value, and the square B is lowered by two pieces of measuring blocks 3 and 4 whose nominal value is close to that of the measuring block 2. Observe the length of the two sub-scale fit the gap at the junction, and repeatedly replace the amount of block 3 or 4, until the long-fitting fit the gap evenly, note the nominal value of the amount of blocks 3 and 4 Δ_1;