Accession Number : AD0621191

Title :   MUTUAL INDUCTANCE BRIDGE FOR AC SUSCEPTIBILITY MEASUREMENTS AT LOW FREQUENCIES,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE NATIONAL MAGNET LAB

Personal Author(s) : Maxwell,E.

Report Date : 02 OCT 1964

Pagination or Media Count : 4

Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. The equivalent of a decade mutual indicator is achieved by using a commercial decade autotransformer in combination with a small fixed mutual inductor. The Gertsch RT-61 transformer is used at 30-400 cps and lower, while the RT-60 is used at approx 1 kc. Both transformers have a nominal accuracy of 0.001%, which is more than sufficient in this use. A lownoise preamplifier followed by a lock-in amplifier is used for null detection. (Author)

Descriptors :   (*ELECTRIC BRIDGES, INDUCTANCE), (*MAGNETIC PROPERTIES, MEASUREMENT), ALTERNATING CURRENT, LOW FREQUENCY, TRANSFORMERS, PREAMPLIFIERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE