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The upper limits for sound level, for all the printers, are as follows. Operating levels are measured during continuous running with 20-pound forms.

Table 24. Sound levels
  LWAd (see note 1) <LpA>m (see note 2) I T
Printing (bels) Idle (bels) Printing (dB) Idle (dB)
60 Hz 8.8 7.8 65 58 Y Y
50 Hz 8.8 7.8 65 58 Y N
  1. LWAd is the sound power emission level.
  2. <LpA>m is the mean value of the space-averaged sound pressure emission levels at one-meter positions.
  3. I is impulsive noise.
  4. T is prominent tones.