(1) A test set reading noise in dbrn uses C-message weighting while
receiving noise through a narrowband filter designed to pass l-kHz
tone.
(2) When controls are adjusted to measure dbrnc, C-message weighting is
used along with a filter designed to pass noise across a band from
0-3 kHz.
(3) A test set reading noise in dba uses F1A weighting while receiving
noise through the narrowband 1-kHz filter.
(4) When controls are adjusted to measure dba with F1A band weighting,
the 0-3-kHz filter passes noise within its response.
(5) For example,
-82
dbm
of
noise
is
equivalent
to
the
following
readings:
8 dbrn = 6 dbrnc = 3 dba (1 kHz) = 0 dba (0-3 kHz)
c. Calculations of Noise Levels.
Example:
Assume a measured noise level of -40 dbm.
What is the level in
terms of dbrn?
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