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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions of the American Institute of Electrical Engineers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
