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Chapter 1
Introduction
Power Amplifier Type 2719 has been designed to drive small vibration exciters, particularly the
112 N (25 lbf) Vibration Exciter Type 4808. The RMS output-current limit is adjustable, and
consequently Type 2719 can drive the 45 N (10 lbf) Vibration Exciter Type 4809 safely to full
rating. The power amplifier has a usable frequency range from DC to 100 kHz. The rated AC
output is 180 VA into a 0.8 Ω exciter or resistive load, in the frequency range DC to 15 kHz
(± 0.5 dB). The maximum voltage gain is 40 dB. Harmonic content of the output is very small as
heavy negative feedback is used and the instrument can tolerate temperature and supply line
variations while maintaining excellent stability.
Type 2719 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.
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