Hydrophone preamplifier control unit

Abstract

A hydrophone preamplifier control unit provides for front panel controls and cable connectors for applying a calibration current and operating voltage to the hydrophone, controlling the level of these voltages, and monitoring the operation of the hydrophone. The control unit assures the continuity of the electrical circuits to a hydrophone through the use of a calibration current applied to the hydrophone through the use of a calibration current applied to the hydrophone through an interconnecting cable.

What is claimed is: 
     
       1. A hydrophone preamplifier control unit comprised of: a power supply having a 12 volt DC and 24 v DC output;   means for adjusting the 24 volt DC output of the power supply to compensate for losses in the power supply;   means for applying a calibration voltage;   means for generating a calibration current from the applied calibration voltage that is applied to a hydrophone preamplifier; and   means for monitoring the calibration current applied to the hydrophone preamplifier.   
     
     
       2. A hydrophone preamplifier control unit, as in claim 1, wherein the means for adjusting the 24 volt Dc output of the power supply is a potentiometer. 
     
     
       3. A hydrophone preamplifier control unit, as in claim 1, wherein the means for applying a calibration voltage is a signal generator. 
     
     
       4. A hydrophone preamplifier control unit, as in claim 1, wherein, the means for monitoring the calibration current applied to the preamplifier is an oscilloscope.