北京光学仪器厂制造的0.5米平面光栅摄谱仪光源电流是依靠外接滑线变阻器来调节的。在定性、半定量分析工作中,一般仅需要2～3个不同数值的电流,如5安、10安;5安、12安或5安、12安、18安等等.利用原来的滑线变阻器调节所需电流,需转动手柄,有时需摇数十转,操作较麻烦,也费时间,对分析的准确度也有影响。我们利用原来的滑线变阻器,在不影响滑线变阻的条件下,于滑线杆的对侧,焊上三根导线(接点 Beijing Optical Instrument Factory manufacturing 0.5 meter plane grating spectrometer light source current is dependent on the external slide rheostat to adjust. In qualitative and semi-quantitative analysis, generally only need 2 to 3 different values ​​of current, such as 5 A, 10 A; 5 A, 12 A or 5 A, 12 A, 18 A, etc. The use of the original slide Rheostat required to adjust the current required to rotate the handle, and sometimes need to shake several dozen turns, the operation is more cumbersome, but also take time, the accuracy of the analysis also have an impact. We use the original slide rheostat, without affecting the slide resistance, the opposite side of the slide bar, welding three wires (contacts