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因为与现场的条件不同,一台在实验室里经过检修并校验合格的仪表,不能说拿到现场就能可靠地工作。为了保证电子电位差计在现场能正常使用,我们模仿现场条件制作了一台试验仪。在实验室里,可以用它对经过检修后的电子电位差计进行等效于现场工作的试验。该实验仪能输出0～100毫伏连续可调的正弦电压,适用于各种不同的分度、不同量程的仪表,以此检查仪表触头与滑线电阻的接触情况。它能模仿现场的自动控制和记录,以检查控制机构和记录机构的灵敏度和准确性。它还能分別或同时给仪表加入横向和纵向干扰信号以检查仪表的抗干扰性能。该试验仪的电路原理如下图所示。图中B为电源变压器。山次级绕组(L_3、L_4)、整
Because of different conditions with the scene, a laboratory in the overhaul and calibration of the instrument can not be said to get on the scene will be able to work reliably. In order to ensure that the electronic potentiometer can be used normally in the field, we made a tester according to the site conditions. In the laboratory, it can be used to repair the electronic potentiometer equivalent to the field work of the test. The tester can output 0 ~ 100 millivolts continuously adjustable sinusoidal voltage, suitable for a variety of different indexing, measuring instruments of different ranges, in order to check the instrument contacts and slip resistance contact. It mimics on-site automation and documentation to check the sensitivity and accuracy of control and recording mechanisms. It can also add horizontal and vertical interference signals to the meter separately or simultaneously to check the anti-jamming performance of the meter. The circuit tester as shown below. B in the picture is the power transformer. Mountain secondary winding (L_3, L_4), whole