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Chapter 1
Introduction
Power Amplifier Type 2732 has been especially designed to drive Modal Exciter Type 4824 but
can be used with any vibration or modal exciter requiring a 120 VA power amplifier. The rated
AC output is 120 VA into a 4 Ω exciter or resistive load. The power amplifier has a usable
frequency range from 40 Hz to 15 kHz (full capacity) or DC to 150 kHz (reduced capacity). The
maximum voltage gain at 1 kHz is 7.7 V/V in low-impedance mode. Harmonic content of the
output is very small as heavy negative feedback is used. The instrument can tolerate tempera-
ture and supply-line variations while maintaining excellent stability. Type 2732 can be used as a
voltage generator with low output impedance and a flat voltage frequency response, or as a
current generator with high output impedance and a flat current frequency response. The RMS
output-current limit is adjustable.
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