Acoustic Noise Declar, VAX 4000 BA400-Series Enclosure Sys

This document, titled "Acoustic Noise Declarations, VAX 4000 BA400-Series Enclosure Systems" (July 1994), provides tabulated acoustic noise emission data for various VAX 4000 BA400-Series computer enclosures and their installed devices/subassemblies.

The declared values are measured according to ISO 9296 and ISO 7779 (and DIN EN 27779 in the German section), and include:

• Sound Power Level (LWAd, B): The total acoustic power emitted by the equipment.
• Sound Pressure Level (LpAm, dBA): The sound pressure measured at typical bystander positions.

Data is provided for both "Idle" and "Operating" states of the systems and components. The document also notes that current values for specific configurations are available from Digital representatives, and clarifies that 1 Bel (B) is equivalent to 10 dBA.