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温度二次仪表被检定后,除对仪表的指示机构和记录机构进行检验外,还须检验恒温控制的可靠性。为此,我们自制了一台恒温控制模拟试验器(以下简称模拟试验器),使用效果良好。该试验器电路原理见上图。图中,K_1为毫伏电源开关(K_1-1型);E为1.5 V的一号电池一节;K_2为毫伏计与电子电位差计——双刀双投选择开关(K_3-3型);K_3为试验器开关(K_1-1型);R_1(4kΩ)、R_2(40kΩ)为限流电阻;Rw_1、Rw_2为信号输出调整电阻;R_1为铜热电阻(150～180Ω),用φ0.08mm的漆包线绕制,骨架可用归线绕电阻轴架或长30mm、轴径15mm的胶木轴架。D为60W白炽灯;J_1、J_3、J_2为输出接线柱;C为中间继电器
Temperature secondary instrument is checked, in addition to the instrumentation and recording agencies instrumentation, but also to test the reliability of temperature control. To this end, we made a self-temperature control simulation tester (hereinafter referred to as the simulation tester), the use of good results. The tester circuit principle see above. In the figure, K_1 is a millivolt power switch (K_1-1 type); E is a battery of 1.5 V; K_2 is a millivolt meter with an electronic potentiometer - double pole double throw selector switch (K_3-3 ); K_3 Tester switch (K_1-1 type); R_1 (4kΩ), R_2 (40kΩ) for the current limiting resistor; Rw_1, Rw_2 for the signal output adjustment resistance; R_1 for the copper thermal resistance (150 ~ 180Ω) .08mm enameled wire winding system can be used Guizhi around the axis of resistance or frame length 30mm, shaft diameter 15mm bakelite shaft frame. D 60W incandescent lamp; J_1, J_3, J_2 for the output terminal; C for the intermediate relay