DBA

Abbreviation for decibels adjusted . Weighted absolute noise power , calculated in dB referenced to 3.16 picowatts (-85 dBm ), which is 0 dBa. ( 188 ) Note: The use of F1A- line or HA1-receiver weighting must be indicated in parentheses as required. A one-milliwatt, 1000-Hz tone will read +85 dBa, but the same power as white noise , randomly distributed over a 3-kHz band (nominally 300 to 3300 Hz), will read +82 dBa, due to the frequency weighting. Synonym dBrn adjusted.