BRUEL & KJAER 2203 - Directional Characteristics

"A", "B", "C"
"Lin ."
"Ext. Filt."
179 .... See Introduction) for the five functions on
the right side of the knob.
Selects a standardized frequency weighting network
for subjective indication of loudness (See Fig. 5. 1 2).
Gives linear frequency response.
Permits connection of an external filter across the
EXTERNAL FILTER sockets. In this position, a meter
deflection is obtained only if an external filter is con-
nected.
INPUT ATTENUATOR (black)
Controls the gain of the input amplifier in seven 1 0 dB steps. Its range
of rotation is such that one of the markings "70"- "Ref." must always
be opposite the black dot . Is used together with the OUTPUT ATTENUA-
TOR to select the measuring range of the instrument. Also selects the
internal reference signal for calibration purposes.
OUTPUT ATTENUATOR (transparent)
Controls the gain of the output amplifier in seven 1 0 dB steps. Its
range of rotation is such that the red lines on the knob can only be ro-
tated in positions anti-clockwise from the black dot. The measuring
range of the instrument corresponding to 0 dB meter deflection is indi-
cated inside the red lines.
GAIN ADJUSTMENT
This screwdriver operated potentiometer varies the gain of the 2203
over at least a 6 dB range (-2 to + 4 dB) permitting calibration for var-
ious K-factors (microphone sensitivities) .
EXTERNAL
FILTER IN
Connects to the input of an external filter . The output impedance of
the socket is <50 but should be loaded by at least 500 0. Accepts plug
JP 0006 or cable AO 0007 .
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