An Electrical Constant Temperature Apparatus

Apparatus for Seebeck coefficient and electrical resistivity measurements of bulk thermoelectric materials at high temperature

A high temperature Seebeck coefficient and electrical resistivity measurement apparatus has been designed and built for measuring advanced thermoelectric materials. The apparatus covers the range of temperatures from 300 to 1300 K. Different sources of errors involved in the two measurements are discussed. The accuracy of the electrical resistivity measurement is estimated to be better than ±1%...

Electrical safety standards for electrocardiographic apparatus.

IN 1972, the Committee on Electrocardiography of the American Heart Association (AHA) first published recommendations dealing with electrical safety in electrocardiographic (ECG) and vectorcardiographic (VCG) instruments.' These specifications were restated in slightly altered form in 1975.2 To our knowledge, practically all manufacturers of ECG equipment sold in the United States now follow th...

Nearly Constant Electrical Resistance over Large Temperature Range in Cu3NMx (M = Cu, Ag, Au) Compounds

Electrical resistance is a material property that usually varies enormously with temperature. Constant electrical resistivity over large temperature range has been rarely measured in a single solid. Here we report the growth of Cu3NMx (M = Cu, Ag, Au) compound films by magnetron sputtering, aiming at obtaining single solids of nearly constant electrical resistance in some temperature ranges. Th...

High temperature X-ray diffraction apparatus.

Development of High Temperature Multiproperty Apparatus

The development of the multiproperty apparatus to include high temperature determinations of specific heat, enthalpy and thermal diffusivity in addition to the properties already measured is described. The latter properties include thermal conductivity, electrical resistivity, Lorenz ratio, total hemispherical emittance, spectral emittance at 0.65 microns and Thomson coefficient. The specific h...