Platinum rhodium thermocouple appear when temperature fluctuation analysis of the main reasons

We when using platinum rhodium thermocouple temperature measurement is easy to appear larger fluctuation, but what are the main reasons of this situation? In this kind of situation we how to efficiently solve? Platinum-rhodium thermocouple if is in the oven temperature measurement, so the computer is curve of the wave is very large, it will also cause the power curve appear big shake, this is what reason is caused? Actually the main reason is the problem of PLC in the, or is happening platinum-rhodium thermocouple itself, but it is also possible that bad has happened to the internal thermal field of the furnace.

actually, in fact, under normal circumstances the ordinary shake is caused by a trouble, because platinum-rhodium thermocouple is mainly millivolt level signal, there will be more prone to be easily interfere. But first we need to solve these problems focusing on the shielding wire do you have any problems, or shielding compensating lead wires around whether has larger electric field, such as power line, second also check all throughout the shielding grounding, shielding should be grounded at one end, and if both ends are grounded, so will certainly cause trouble, so, the problem is sure to platinum rhodium thermocouple itself and PLC are not too many relations.