自动电子电位差计(以下简称仪表)的示值误差超过最大允许误差时,通常采用调整桥路电阻的办法使误差减小。但是,有的仪表调整桥路电阻不能使各点误差都合格。例如,有一台XWB—101型0170号0—1100℃仪表,几次调整桥路电阻仍不合格(表1)。粗略一看,这台仪表的误差有正有负,大小不一,没有规律性,即所谓“不规则误差”。 Automatic electronic potentiometer (hereinafter referred to as meter) indication error exceeds the maximum allowable error, usually by adjusting the bridge resistance to reduce the error. However, some instruments adjust the bridge resistance can not make every point of error are qualified. For example, there is a XWB-101 Model 0170 0-1100 ℃ instrument, several times to adjust the bridge resistance is still not qualified (Table 1). A rough look, this instrument has positive and negative errors, different sizes, there is no regularity, the so-called “irregular error.”