audio frequency meter 434-B
Datec. 1930
Inventory NumberRS0247
ClassificationTest Equipment
Subject
Maker
General Radio Company
1915-present
Cultural Region
Place of Origin
Dimensions23 x 31 x 21 cm (9 1/16 x 12 3/16 x 8 1/4 in.)
Material
DescriptionA General Radio type 434-B, serial number 23, audio frequency meter, mounted in walnut cabinet with bakelite front/knobs and brass fixtures.
Signedetched and white filled: AUDIO FREQUENCY METER / TYPE 434-B SERIAL NO. 23 / GENERAL RADIO CO. / CAMBRIDGE, MASS.
FunctionPossible function:
The complete assembly consisted of a superregenerative receiver coupled to an electronic AUDIO-FREQUENCY METER through an amplifier and electrical filter unit. The output of the receiver was applied to the input of a high-speed recording
voltmeter. In effect, the assembly converted audio-frequencies into a graphical chart whose abscissa could be calibrated directly in terms of the measured parameters.
http://www.sil.si.edu/smithsoniancontributions/HistoryTechnology/pdf_lo/SSHT-0053.pdf
The complete assembly consisted of a superregenerative receiver coupled to an electronic AUDIO-FREQUENCY METER through an amplifier and electrical filter unit. The output of the receiver was applied to the input of a high-speed recording
voltmeter. In effect, the assembly converted audio-frequencies into a graphical chart whose abscissa could be calibrated directly in terms of the measured parameters.
http://www.sil.si.edu/smithsoniancontributions/HistoryTechnology/pdf_lo/SSHT-0053.pdf
![precision wavemeter, General Radio model No. 224, Serial No. 113 [?]](/internal/media/dispatcher/44354/postagestamp)
General Radio Company
Date: early 20th Century
Object number: RS0243b
