Applied Magnetics Laboratory

Model E4991A (Agilent)

The Impedance/Material Analyzer is used to measure the electrical impedance of devices as a function of frequency. An available fixture and software allows measurement of the complex magnetic permeability of toroidal samples. 

Manufacturer's Website

Impedance Measurement Capabilities

• Frequency range DC to 3 GHz (1 mHz resolution)
• DC bias ±40 V (1 mV resolution)
• Maximum voltage ±40 V peak max (AC + DC)
• Measured parameters |Z|, |Y|, L_s, L_p, Cs, R_s(R), R_p, X, G, B, D, Q, Θ_z, Θ_y, |Γ|, Γ_x, Γ_y, Θ_y
• Measurement range |Z| 130 mΩ to 20 kΩ (at 1 MHz)
• Sample dimensions:

Material Measurement Capabilities

• Frequency range 1 kHz to 1 GHz (1 mHz resolution)
• Measured Parameters |μ_r|, μ_r', μ_r'', tan(δ)
• Sample Dimensions:
  • Toroid
  • Outside diameter: 20 mm maximum
  Inside diameter: 5 mm minimum
  • Height: 8.5 mm maximum

Example Data