Development of 1800F-400F Fibrous-Type Insulation for Radioisotope Power Systems. Phase I, Final Report, Appendix A. Volume 2. Page: 19 of 173
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and the fixture end restraints. The contact resistance at these sur-
faces is not critical, but it is desirable to obtain equal contact
over all of the available area. Special fittings are used which match
the element size. Prior to passing current through the element, the
voltage probes are brought in contact with the element,and continuity
is verified by observing the response of a VTVM. When probe contact
resistances are low enough to have a negligible effect on the VTVM
reading, the response will be nearly zero. The probes are adjusted
until this zero reading is achieved. Alternating current is then
passed through the element (usually set to 1 ampere), and the VTVM
response is observed. The element is then rotated 1200 and measured
again after reconfirming probe continuity. A third and final mea-
surement is made after a second 120 rotation. These three readings
are averaged to obtain a single value which is converted into desired
units of measure.
The open circuit voltage was measured in the apparatus shown in
Figure 3. In this measurement one end of the element is maintained at
0
150 F, and the other end is maintained at 950 F. These are nominal
set points. When steady state conditions have been achieved, the volt-
age across the element is measured. The ten carbon discs which can be
seen in Figure 3 provide a thermal connection between the installed
elements and the electrical heat source. A thermocouple is located in
each carbon disc to measure the temperature. Water cooled heat sinks
are placed on the top surface of the installed elements after installa-
tion of a predrilled insulation block (shown in foreground of Figure 3).
Measurements are made in accordance with NPS 11-024.
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Collins, J. O. Development of 1800F-400F Fibrous-Type Insulation for Radioisotope Power Systems. Phase I, Final Report, Appendix A. Volume 2., report, January 1, 1967; Manville, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1030436/m1/19/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.