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of 1 g in the direction shown in the figure. The frequency range is 20 Hz to
5000Hz.
2.3.4. Acoustic Sensitivity
The effect due to acoustical excitation is shown in F ig.2.1 0. The figure
shows the output level of the preamplifier fitted with a dummy transducer,
(capacitance 50 pF), when subjected to a constant acoustic environment of
120 dB SPL re 2
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40kHz. At 120 dB sound pressure level the output is less than 300 J.lV.
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Fig.2.10.
Noise output from the preamplifier with a dummy transducer,
when subjected to an acoustic environment of 120 dB SPL
2.3.5. Magnetic Field
The preamplifier will operate satisfactorily without any deviation from
the specifications in a magnetic field of strength up to at least 100
Aim.
2.3.6. Shock Sensitivity
The preamplifier is designed to be largely unaffected by shock con-
ditions. It has been tested with 1000 repeated 40 g shocks without any
deviation from the specifications.
16
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