MODEL 0B-45
OCTAVE BAND FILTER SET
GENERAL DESCRIPTION
The Quest h'|odel OB.,15 Oct_ive Band
Filter ix a plug-in n'*odtlle cent;lining a selecta-
ble set of filters. It ix used primarily with tile
Quest l_lodel 215 Sound Level hleter forming
the Model 215-d5 Octave Band Analyzer. The
OB-,I5 meets the most stringent requirements
_)f ANSI $1,11-1971 for Octave Band l,'ilters.
'Pileunit coat, ins nine select_|l)le filter ranges
from 31.5 I1_. to 8 l(llz center frequencies
with full octave band width. Primary uses ill-
elude frequency analysis for audiometric
rooms and audiometer calibrt_tion, Coulmuai-
ty noise, product noise emissiotl, and sLructur* _:i0ur09.
al and material acoustics. Active filters are om])loy¢_d throughout
permitting tile high accuracy and small size configunltion.
SPECIFICATIONS
Freqtlency Range: Nine rallges, 31.5 I-lz to 8 l{Ilz center fre.
quencies, f_l]-dctave I)and ',vidth,
Filter Transmission Effectiveness: z_.ppro.ximlLtely 20 ell] down
per octave from center froqttency.
Standard: hleets ANSI $1.11-1971 for tYl)_ E, Class II Filter
Sets,
I/ll)UL: (From 215 Soulld Level hleter) 0 to 'I volts rms, 20 I-Iz
to 10-J_f"_.
O_: (To 215 Sound Level_leter)0 to ,Ivoltsrms, output
impedance less than 1 ohm,
Power Source: No internalpower soul'co.Batteryvoltageisoil-
l_line¢lfrom the 215 SoulldLevel51eterthrough the connector.
Ol)eratiIlgTempemture:-I0 ° to +50°C
Op.__e.ratitlgllu_ulidity:0.95% relativehumidity.
Cotlnuctor: Six.pill Cinch.Jones type.
1,t
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