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LDC1000 and influence of external magnetic field

We have a turning magnetic multipol encoder in the near of our sensing coil (tank circuit of LDC1000).
The magnetic multipol encoder is rotating with different Speed (0 up to 20 kHz).

How does this external magnetic field influence the measurement

  • if encoderspeed = 0
  • if encoderspeed = sensorfrequency, e.g. encoder = 20 kHz, f sensor = 20 kHz 
  • if encoderspeed < (less then 50% of) sensorfrequency, e.g. encoder = 20 kHz, f sensor = 40 kHz 
  • if encoderspeed << (less then 10% of) sensorfrequency, e.g. encoder = 10 kHz, f sensor = 500 kHz

Thanks.