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国内外现有的记录仪,虽然指示精确度可以做得较高,但记录精确度因受环境条件的限制而不能达到满意的结果。如JB 1273-73对自动平衡式电位差计和平衡电桥记录仪的技术条件规定: 仪表等级指示精确度记录精确度 0.3 ±0.3% ±0.8% 0.5 ±0.5% ±1.0% 我们分析记录精确度低的主要原因是,记录纸随周围环境条件的变化而有明显的涨缩现象造成的。在仪表使用环境的两个极端温湿度条件下,一般仅记录纸的横向涨缩之差可能超过仪表允许的误差范围,因此目前记录仪的等级是以指示精确度来区分的。但在实际使用中,往往是仪表在作自动记录却无专人在旁边监视指示的数值。这样就难免出现较大的记录偏
The existing recorders at home and abroad, although the indication accuracy can be done higher, but the recording accuracy due to environmental conditions can not be satisfied with the results. Such as JB 1273-73 automatic balance type potentiometer and balanced bridge recorder specification: Instrument grade indication Accuracy Recording accuracy 0.3 ± 0.3% ± 0.8% 0.5 ± 0.5% ± 1.0% We analyze the recording accuracy The main reason for the low is that the recording paper is obviously caused by the change of the surrounding environment. In extreme conditions of temperature and humidity in the environment of the instrument, the difference between horizontal expansion and contraction of recording paper generally exceeds the allowable error range of the instrument, and therefore, the current recorder level is distinguished by the indicated accuracy. However, in actual use, it is often the value of the indicator that is automatically recorded by the meter and no indicator is displayed next to it. This will inevitably lead to a larger record bias