MUTUAL INDUCTANCE BRIDGE FOR AC SUSCEPTIBILITY MEASUREMENTS AT LOW FREQUENCIES,

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)

Document Details

Document Type
Technical Report
Publication Date
Oct 02, 1964
Accession Number
AD0621191

Entities

People

  • E. Maxwell

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Amplifiers
  • Autotransformers
  • Detection
  • Frequency
  • Indicators
  • Inductance
  • Inductors
  • Measurement
  • Preamplifiers
  • Standards
  • Transformers

Fields of Study

  • Physics

Readers

  • Electrical Engineering