ADS7128 RMS Test (QT Py M0 DMA DAC)
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Test 1: RMS of sine wave
  RMS value: 40066
  Expected range 25000-60000: yes ... PASS

Test 2: RMS with DC subtraction
  Plain RMS: 40099
  DC-sub RMS: 23061
  DC-sub < plain: yes ... PASS

Test 3: RMS amplitude scaling
  Full amplitude RMS (DC-sub): 23043
  Half amplitude RMS (DC-sub): 11534
  Half RMS < Full RMS (with 20% margin): yes ... PASS

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RESULTS: 3/3 tests passed
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