Accession Number : AD0621094

Title :   A COAXIAL CALORIMETER FOR USE AS A MICROWAVE POWER STANDARD,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) RADIO AND ELECTRICAL ENGINEERING DIV

Personal Author(s) : Clark,Richard F.

Report Date : 28 SEP 1964

Pagination or Media Count : 6

Abstract : A coaxial calorimeter has been built for use in the comparison of power at high frequencies with dc resistance and voltage standards. The temperature rise of the metal jacket of a 50-ohm coaxial termination is measured with a thermopile when a known level of dc power is fed into the calorimeter. The high-frequency sensitivity of the calorimeter is obtained by modifying the dc sensitivity for: (1) Input VSWR of the calorimeter, (2) Attenuation of a 6-inch length of thermally insulating input coaxial line, (3) The effect of current distribution in the load. The accuracy is estimated at better than =1 per cent below 4 Gc/s with the largest errors due to the input VSWR of the calorimeter. (Author)

Descriptors :   (*RADIOFREQUENCY POWER, STANDARDS), (*CALORIMETERS, COAXIAL CABLES), MEASUREMENT, THERMOCOUPLES, DIRECT CURRENT, VOLTAGE, ELECTRICAL RESISTANCE, HIGH FREQUENCY, ATTENUATION, STANDING WAVE RATIOS, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE