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IBM Systems - Acoustical Noise Declaration for System z9 109

Declared Noise Emissions in Accordance with ISO 9296
Product Description Declared A-Weighted Sound Power Level, LWAd(B) Declared A-Weighted Sound Pressure Level, LpAm(dB)
Operating Idling Operating Idling
Typical configuration: Two processor books and three I/O cages. Nominal operating conditions and front and rear doors closed. 7.5 7.5 55 55

Notes:

  1. LWAd is the statistical upper-limit A-weighted sound power level (rounded to the nearest 0.1 B);
  2. LpAm is the mean A-weighted emission sound pressure level measured at the 1-meter bystander positions (rounded to the nearest dB);
  3. 10 dB (decibel) = 1 B (bel);
  4. All measurements made in conformance with ISO 7779 and declared in conformance with ISO 9296

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