For my project, I need to measure AC current for a 220V load (a more detialed description of the initial approach and problems can be found here.
With a DSO I tried to get an idea of the signal that comes from the sensor, and I get this :
Which is pretty much as expected, except for the noise. The measurement for the 'load connected' case seems to be the sum of the right sine wave for the load and the 'no load connected' noisy signal.
- Is this normal?
- Do these sensors need additional signal conditioning?
- If yes, how?
- Is it possible to digitally compensate for this noise once the signal is measured by an ADC?