BRUEL & KJAER 4220 Instructions And Applications

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4220
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INSTRUCTIONS , AND APPLICATION S
Pistonphone Type 4220
The Pistonphone i. a compact battery-<>perated
preci.ion sound .ource, designed to enable quick
and accurate overall calibration of .ound measur·
ing equipments. It produces a sound pressure
level of 124 dB at the microphone diaphragm, at
a frequency of 250 HL
Narum. Denmark
12'
80 05 00 .
$'
BRUKJA, Copenh_ . Tele. : 5316
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Acalerom...,.
• Acouatlc St.ndlng W.va AppaqIuI
Attlflcl.1Ea~
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Artlflcl.l VolCft
Audio Fraquency Re.pon .. Tr-'
Audio fraquency Spectrometen
Audio Frequ4tncy Va<uurn-
Tube '
• Vol_ ... · ,
Automatic A. F.Reapen ......
Spectrum Reoordera .
Automatlo Vibr.tion.Exciter'
Control Gener.tora •
B.nd.P .... Flh.r
Seq
a...t Fraqu.ncy Osclll.tora
Comple. Modulu. Appar.""
. Conden .. ; Microphones ,
Deviation Bridges
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Diatortlon Me •• urlng Bridget
Fraquency Analyze,.
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neq ... nc ' :y M ..... r!ng Brld".
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A~,pa:r.tl'"
· HI.t •• rc>.~vr .. Voltmeten
· Level Record.ra