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shift in RTD Reading



Hey all,
Using an RTD to measure temperature in a fluid flow line. When a VFD gets turned on to start a fan (600V) the temperature reading drops by ~4°C. Using National Instruments Fieldpoint RTD module to read temperature. It is my understanding that noise that causes an offset like this has a DC component. Is this true? If so, Why (or how)would a variable frequency drive cause DC level noise? Any ideas on how to remedy this?


Dan W




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