PT100 temperature patrol instrument, when the converter is not open, the measurement is normal. Once opened, it shows completely disorder, and sometimes there are puzzling characters. How can I solve this problem? Please enlighten master!
In the complex electromagnetic environment, AnyWay advocates the idea of digital front end, that is, in the vicinity of being measured, the signal will be digitized, and then the uploaded information will be uploaded to the host computer through digital communication. Digital transmission is much better than analog transmission in anti-interference ability. If the electromagnetic interference is very large, the transmission line can be changed into optical fiber transmission. In this way, the transmission link can completely avoid interference.
In your description of the problem, the patrol instrument shows that there has been a disturbance, then it shows that the patrol meter itself has been greatly disturbed and the work is out of order! If you can't add these two options, you can only change the test scenario.
If only the temperature measurement fluctuations, as the temperature is slow change, the filter is more effective way, the filter can use a passive RC low-pass filter, and then connected to the patrol instrument on the terminal can.
To clear the train of thought, in order to achieve the normal work of the temperature detector, it is impractical to test the inverter. So what we can do, basically, is shielding, filtering, grounding, and the like.