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我厂新制水间的电导仪,在未采取措施之前,受干扰影响严重,不能使用。这种干扰有一定的时间性,一般是早晨5点钟开始,电导仪突然失去控制,指针无规律地波动,无法读数。当用手逐渐接近装有被测液玻璃杯时,读数增大,直至无穷。到下午1点钟仪器恢复正常,读数正确。起先,我们怀疑这个干扰来于电源。后来用三台DDS-11A电导仪同时在全厂的七个不同地方作了反复五十多次测试都有同样现象。在接地最好的配电间,干扰仍然很大。我们还通过二级交流稳压电源,保证了电源质量,但电导仪仍然不能正常工作。这样我们就排除了电源问题。通过大量的研究和反复实验,发现在仪器周围存在一个具有一定频率的干扰信号作用于电导仪、电极
The conductivity meter of new water system in our factory was seriously affected by the interference before it was taken, so it can not be used. This interference has a certain time, usually 5 o’clock in the morning, the conductivity meter suddenly lost control, irregular fluctuations in the pointer, can not read. As you progressively approach the glass containing the liquid being measured, the reading increases until it reaches infinity. The instrument returned to normal at 1 o’clock in the afternoon and the reading was correct. At first, we suspect this interference comes from the power source. Later, with three DDS-11A conductivity meter at the same time throughout the plant in seven different places made repeated test more than 50 have the same phenomenon. In the best grounding distribution, the interference is still great. We also through the two AC power supply, to ensure the power quality, but the conductivity meter still can not work properly. So we ruled out the power problem. Through a large number of studies and repeated experiments, found in the instrument there is a certain frequency interference signal acting on the conductivity meter, the electrode