Electronically Balanced Recorder for Flight Testing and Spectroscopy
- 1 April 1946
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers
- Vol. 65 (4) , 205-208
- https://doi.org/10.1109/t-aiee.1946.5059332
Abstract
A multiple-point potentiometer recorder for thermocouples is described having a slidewire driven to balance by a small induction motor powered from a 6L6 electron tube. The preamplifier gain is sufficient that the conventional input transformer (voltage step-up type) is not required, and thus a high impedance input circuit is made available. This permits the use of small capacitance values in the RC circuits for signal filtering and motor damping. The relation of this to the short balancing time (1.5 seconds) is discussed. Spectroscopy supplied the incentive for the development of two additional but similar recorders. The first of these is a curve-drawing multiple-range microampere recorder with the smallest range 0.5 microampere, and with a balancing time of less than 1.0 second. The second is a multiplerange current-ratio recorder requiring only about 10 microamperes for the reference current.Keywords
This publication has 2 references indexed in Scilit:
- Direct Intensity Measurements of Spectrum Lines with Photo-Multiplier Tubes*Journal of the Optical Society of America, 1945
- Combined Thyratron and Tachnometer Speed Control of Small MotorsTransactions of the American Institute of Electrical Engineers, 1938