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检定标准和工业用热电偶所用的转换开关,对寄生热电动势均有一定的要求,检定一、二等标准热电偶和工业用热电偶,其寄生热电动势应分别小于0.4、0.5和1微伏。适合于用比较法(双极法)和同名极法(单极法)检定热电偶用的转换开关,目前生产的不多,远不能满足计量部门和有关工厂、科研单位检定热电偶的需要。现介绍一种用四旋钮电阻箱(如 ZX36型)改制成比较法和同名极法两用转换开关,供需用单位参考。一、改制方法将旋转式电阻箱上的各电阻取掉,装置固定在一小木箱上(亦可用铁皮或胶木制作,便于电刷油浸),并在木箱上安装7～9对接线柱,每对接线柱
Calibration standards and industrial thermocouples used in the switch, the parasitic thermoelectromotive force have certain requirements, test the first and second class standard thermocouple and industrial thermocouple, the thermoelectromotive force should be less than their parasitic 0.4, 0.5 and 1 microvolt . Suitable for the comparison method (bipolar method) and the same name pole method (unipolar method) test thermocouple conversion switch, the current production is much, far can not meet the needs of the measurement department and the relevant factories, research institutes test thermocouple. Is now introduced with a four-knob resistance box (such as ZX36-type) into a comparative method and the same name pole method dual-purpose switch for supply and demand units. First, the restructuring method Remove the resistance of the rotary resistance box removed, the device fixed in a small wooden box (also available iron or bakelite, easy brush oil immersion), and in the wooden box to install 7 to 9 pairs of terminals , Each pair of posts