31 | Keysight | E4991B Impedance Analyzer - Data Sheet
Typical Material Measurement Accuracy When Using
Options 002 and 007 (continued)
Typical permeability measurement accuracy:
µr´ accuracy
4 +
Δµ´r m
µ´r m
Eµ
=
:
15
F × µ´r m
2 × f 2
0.02
f
25
F × µ´r m
×
+ F × µ´r m × 1 +
[%] (at tand < 0.1)
Loss tangent accuracy of µr (= Δtand) :
± (Ea + Eb ) (at tand < 0.1)
where,
Ea
=
0.005
F × µ´r m × f
0.002 +
+ 0.004 × f
Eb
=
Δµ´r m
µ´r m
tand
100
×
f
=
=
Measurement frequency [GHz]
c
F
h ln
[mm]
b
h
=
=
=
=
=
Height of MUT (material under test) [mm]
Inner diameter of MUT [mm]
Outer diameter of MUT [mm]
Measured value of µ´r
b
c
µ´r m
tand
Measured value of loss tangent
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