Apparatus for determining the extremes of physical dimensions

摘要

In order to determine the maximum value of the output voltage of an amplifier, costly measurement amplifiers are hitherto used provided with a measuring instrument having a pointer stop that shows the maximum value of the output voltage. The new system has a more simple structure. It converts the output voltage into an acoustic signal, the frequency of which depends on the output voltage. The system can be used for adjusting aerials.