New Sound And Vibration Analyzer

The Type 15G4-A Sound and Vibration Analyzer is designed primarily for the frequency analysis of acoustic spectra having components in the frequency range between 2.5 c-ps and 25 kc. It incorporates many important improve-

1 J. J. Faran, Jr.. "A Now Analyzer for Sound and Vibration," General Radio Experimenter, 33, 12, December, 1959.

ments over its predecessor, the Type 1554-A,1 which make it more useful and easier to operate.

Two band widths are provided, each a fixed percentage of the frequency to which the analyzer is tuned. The one-third-octave bandwidth is useful with moderately varying continuous spectra

1 J. J. Faran, Jr.. "A Now Analyzer for Sound and Vibration," General Radio Experimenter, 33, 12, December, 1959.

Figure 1. Panel view of the Type 1564-A Sound and Vibration Analyzer in Flip-Tilt case, with cover removed. Also shown is the Type 1560-P4 PZT Microphone Assembly.

Figure 1. Panel view of the Type 1564-A Sound and Vibration Analyzer in Flip-Tilt case, with cover removed. Also shown is the Type 1560-P4 PZT Microphone Assembly.

CONTENTS OF THIS ISSUE Page

New Performance, New Convenience with the New Sound and Vibration

Analyzer 1

Improved Coaxial Termination 9

New Connectors, New Adaptors for the 874 Line 10

Sales-Engineering Offices. 11

(noise). The one-tenth-octave bandwidth can resolve sharply varying continuous spectra or discrete frequency components. The center frequency in each case is continuously tunablp. In addition, a flat (all pass) amplifier response permits measurement of the over-all level of the input signal. The analyzer can operate directly from a transducer (microphone or vibration pickup) or, for greater sensitivity, from the output of sound-level and vibration meters. With the Type 1521-A Graphic Level Recorder,2 it forms a recording analyzer for automatic amplitude-frequency plotting.

Equally at home in the laboratory or in the field, the analyzer is available in the convenient Flip-Tilt case, weighing

2 M. C. lloltje and M. .J. Fitzmorris, "A Graphic T.evel Recorder with High Sensitivity and Wide Ranges," General Radio Experimenter, 33, 6, June, 1059.

less than 15 pounds, or in a rack-mount adaptation. It can be powered by either a 115/230-volt line or by the internal, rechargeable nickel-cadmium battery.

It can also analyze electrical signals, and an accessory audio-frequency probe is available to facilitate connection to circuit elements.

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