40 | Keysight | E4991B Impedance Analyzer - Data Sheet
Typical Effects of Temperature Change on Permeability
Measurement Accuracy (continued)
Typical accuracy of permeability parameters (continued):
K6
= at 1 MHz ≤ ƒ < 500 MHz
{F × (µ´ – 1) + 20} × ƒ
r m
2 × 10-6 × (0.3 + 3 × ƒ) ×
|1 – 0.01 × {F × (µ´ – 1) +10} × ƒ2
|
r m
at 500 MHz ≤ ƒ ≤ 1 GHz
{F × (µ´ –1) + 20} × ƒ
|1 – 0.01 × {F × (µr´ m –1) +10} × ƒ2|
r m
2 × 10-6 × (1.5 + 0.6 × ƒ) ×
ƒ
= Measurement frequency [GHz]
c
b
F
= h ln
[mm]
h
= Height of MUT (material under test) [mm]
= Inner diameter of MUT [mm]
b
c
= Outer diameter of MUT [mm]
µ´
ΔT
= Measured value of µ´
r
= Difference of measurement temperature from calibration temperature
Use ΔT = 0 °C if temperature compensation is set to off and the
difference ≤ 5 °C.
Use ΔT = 0 °C if temperature compensation is set to on and the
difference ≤ 20 °C.
ΔTmax = Maximum temperature change (°C) at test port from calibration
temperature after the calibration is performed.
Use ΔTmax = 0 °C if maximum temperature change ≤ 10 °C.
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