A Multiple-Range Self-Balancing Thermocouple Potentiometer Page: 2 of 18
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3 117 601435 155
I NACA RM E5H31
NATIONAL ADVISORY CCMIUflEE FOR AERONAUTICS
RESEARCH MEMORANDUM
A MULTIPLE-RANGE SELF-BALANCING TBLMOCOUPLE POTENTIOMETER
By I. Warshawsky and M. Estrin
to SUMMARY
A multiple-range potentiometer circuit is described that provides
automatic measurement of temperatures or temperature differences with
any one of several thermocouple-material pairs. Techniques of auto-
matic reference-Junction compensation, span adjustment, and zero sup-
pression are described that permit rapid selection of range and wire
material, without the necessity for restandardization, by setting of
two external tap switches.
INTRODUCTION
The design of centralized instrumentation for rocket research at
the NACA Lewis laboratory required that there be made available in a
central instrument room means for recording accurately a number of tem-
peratures and temperature differences as measured by thermocouples
located in the various test cells. The method of operation required
that, within a few minutes, the central instruments be disconnected
from one test installation and connected to another and that the ranges
of the instruments be altered to suit the needs of the new installa-
tion. The new ranges required might differ a great deal from the pre-
ceding set because the types of test conducted in the various cells
were of radically different natures.
The requirements for this instrumentation were met in part by the
provision of a group of 12 multiple-range single-point strip-chart
recording thermocouple potentiometers located in the instrument
room. The terminals of these instruments were made available in each
test cell by use of multiple-pole switches and of cables leading from
the central room to each test cell. Ranges were changed by manually
setting one or two knobs on the front of each instrument. These poten-
tiometers have the following features:
(1) Several direct-reading temperature ranges are provided for use
with a variety of thermocouple materials.
(2) Several millivolt ranges are provided for temperature-
S difference measurements.
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Warshawsky, I. & Estrin, M. A Multiple-Range Self-Balancing Thermocouple Potentiometer, report, November 5, 1951; (https://digital.library.unt.edu/ark:/67531/metadc59103/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.