PHY 4822: ESR documentation

• manufacturer (Klinger -- Leybold-Heraeus) information:
  • ESR expt.overview   (from LH catalog)
  • ESR experiment description
  • Helmholtz coil specs
  • LH ESR expt with DPPH
  • LH Resonance absorption of a passive RF oscillator circuit
  • Pasco ESR documentation
  • PHYWE documentation   (different setup, but may still be useful)