Accession Number:

AD0266595

Title:

A HIGHLY ACCURATE SQUARE-LAW RECORDER

Descriptive Note:

Final rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1961-08-01

Pagination or Media Count:

20.0

Abstract:

The square-law recorder is an instrument designed to take signals from zero to one volt rms in a narrow frequency band centered at 50 kc as in input and record in strip-chart form the square of this input times some fixed constant. The squaring process is performed by keeping the power to the filament of a temperature-limited thermionic diode constant by reducing the direct current to the filament as an ac signal is applied. Since the maximum power supplied by the ac signal is only a small fraction of the total filament power, the decrease in direct current is proportional to the square of the alternating current. The system has negligible zero drift, and the power scale is inherently linear without the use of large correction factors. The accuracy of the chart readings is better than 1 for values above 10 full-scale deflection, and the zero drift is less than 12 full scale over a 6 hour period. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE