论文部分内容阅读
随着半导体业的发展,上海求精仪表厂制成95型半导体点测温计。该测温计体积小、重量轻(约1.5公斤)、使用简便,在焊接测温中得到了应用。原理和结构该仪器是用不平衡电桥原理设计的。线路如下图所示。当切换开关S接通电路接点1时,调节R_(?),使电表指针校至满刻度(95—B型测温范围,0～100℃;95—C型测温范围:75～150℃),即能固定桥路的工作电压,消除干电池电压变化所引起的误差。当切换开关S接通热敏电阻R_T时(接通接
With the development of the semiconductor industry, Shanghai Refinement Instrument Factory made 95 type semiconductor point thermometer. The thermometer small size, light weight (about 1.5 kg), easy to use, in the welding temperature has been applied. Principle and structure The instrument is designed with unbalanced bridge principle. The line is shown below. When the switch S is connected to the circuit contact 1, adjust R_ (?), So that the meter pointer calibration to full scale (95-B temperature range, 0 ~ 100 ℃; 95-C-type temperature range: 75 ~ 150 ℃ ), Which can fix the bridge’s operating voltage, eliminating the battery voltage changes caused by the error. When the switch S is connected to the thermistor R_T (connected