BRUEL & KJAER 2203 - Microphone and Extension Rod; Meter Switch and Scale

MICROPHONE:
PROTECTION GRID:
EXTENSION ROD
UA 0196:
Half-inch condenser Microphone Type 4165.
Protects the diaphragm of the microphone from physical damage. This
grid should not be removed, except when the microphone is to be fit-
ted with a Nose Cone or Rain Cover, or for inspection of the dia-
phragm. DO NOT TOUCH THE DIAPHRAGM WITH ANY OBJECT.
This flexible rod connects the microphone to the sound level meter at a
sufficient distance that the influence of the body of the sound level
meter and operator on the sound field is minimized. This extension rod
must be used in order for the instrument to conform to precision stan-
dards.
If a Dehumidifier Type UA 0308 is used, it is placed between the mi-
crophone and extension rod.
When screwing the microphone, extension rod, and sound level meter together, only
light finger torque should be used.
METER
SWITCH:
AMPLIFIER ON:
METER SCALE:
10
This 11-position switch controls the main functions of the 2203, as
follows:
"On Pull": When the switch is pulled out, the 2203 is turned on and
the AMPLIFIER ON lamp will flash. Allow at least 20 s for warm-up be-
fore using the instrument.
"Batt.": If the meter needle deflection is below the area marked "Bat-
tery", the batteries must be replaced (see section 3.1 ).
"Fast": The five positions on the left side of the METER SWITCH give
the "Fast" meter response. (See Fig.14 in Chapter 1 .)
"Slow": The five positions on the right side of the switch give the
"Slow" meter response. (See Fig. 14 in Chapter 1.)
"A", "B", "C": Each position selects one of the standardized frequency-
weighting networks. (See Fig.1 in Chapter 1.)
"Lin.": Gives linear frequency response within the limits of the instru-
ment, see Chapter 1 .
"Ext. Filter": Selects an external filter connected to the EXTERNAL FIL-
TER sockets. No meter needle deflection will be obtained in this posi-
tion if a filter is not connected.
This lamp flashes when the instrument is switched on.
The upper scale (black) is calibrated from "-1 O"dB to "+ 1 0" dB for
the reading of sound level (or vibration level). "0" dB on the scale
corresponds to the attenuator setting indicated inside the red Jines.
Thus, for example, if the meter shows "-2" dB and the attenuator
setting is "70" dB, then the sound level is 68 dB.
The
lower scale (red) is used for calibration of the instrument using
the microphone K factor. This K factor is found on the individual cali-
bration chart provided with the microphone.