ACCESSORIES
MODEL CA-12 SOUND LEVEL CALIBRATOR
DESCItII"I'ION
Tim Quest CA-12 SottndLevelCalibrator _l_,v_l_
is a self-containedunit that quicklyand pr,,-
ciselyverifiesti_eaccuracy of microl}hones
and sotmd measuring instruments.'rb_Calf
I)rator generates a reference s0tlnd 14!vel _t
precisely110 dB and lO00 IIz.
The unit isbattery operated and there-
fore fullyportable.TileCA-12 isprimarilya
field instrument for on-the-spot accuracy
cheeks of sound le'¢el meters, noise dosimeters
_Ind other microphone instrtm'_ents,
The CA-12 consistsof a stllblc100O llz Figure17.
oscillator,amplifier stage,magnetic acoustic
transducer,llnda coupler th;lt acceptsthe standardi-i/8inch diam-
eter microphone. A separateadaptor isalsoprovidedtoaccomodate
a 15/16 (one inch)diameter microphone. Other adaptorsto accom-
modate smaller microphones C[111alSO b_ used.
The Calihrator employs solid state integrated circuitry that pro-
vides accurate and stable performance. The block diagram (Figure 18 )
shows the basic operating sections of the unit. Regtflatioo against
battery drain is inherently provided in the electronics.
SIlace
,llj*gv __ _:J':;:::
Microphone
Figure lB. CA.12 Calibrator Block Diagram
o3
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