JJX—3型井斜仪出厂允许误差是正负30′,但在1°以内的倾角测量中,往往出现负值。例如,仪器读数为-20′时实际斜度为30′左右。在实践中摸索发现其主要原因是由于支承测量系的“下顶针”过度磨损所致。在此谈谈我的浮浅认识。 1.“下顶针”磨损为什么会出现负值? JJX-3-type inclination meter factory allowable error is plus or minus 30 ’, but within 1 ° dip angle measurement, often negative. For example, the actual slope is about 30 ’when the instrument reads -20’. In practice, found that the main reason for exploration is due to excessive wear and tear of the “under the thimble” supporting the measurement system. Here to talk about my superficial understanding. 1. Why does the “thimble” wear negative?