Specifications

25
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2525
16451B Dielectric Test Fixture
Terminal Connector: 4-Terminal Pair, BNC
Dimension (approx.): See page 29
Cable Length (approx.):
0.8 m(from connector to electrodes)
Weight (approx.): 3700 g
Measurement Accuracy
(supplemental performance characteristics):
f: measured frequency [Hz] f≤ 30MHz
’
rm
: measured permittivity
tan : measured dissipation factor

0
: permittivity of air 8.85410
-12
[F/m]
d: diameter of electrode {A,B}
t: thickness of material [mm]
Az: Impedance measurement error of instrument
Ad: D measurement error of instrument
The material is assumed to be ideally flat.
The above equation is applicable for electrodes A and
B when using the contacting electrode method.
Up to 110 MHz (4-Terminal Pair) Material
Description: The 16451B is used to evaluate the dielectric constant
of solid dielectric materials accurately, and complies with ASTM
D150. The 16451B employs the parallel plate method, which sand-
wiches the material between two electrodes to form a capacitor.
LCR meter or an Impedance Analyzer is then used to measure the
capacitance created from the fixture. A measurement block diagram
of the parallel plate method is shown below:
Notice the stray capacitance, which is formed on the test material
as shown in the figure above. The guard electrode helps to eliminate
the stray capacitance at the edge of the electrode.
Basic Measurement Accuracy (including the 4294A):
Parallel plate method
Typical Permittivity ( r') Measurement Accuracy:
4294A with 16451B
Typical Loss Tangent (tan ) Measurement Accuracy:
ε
'
r
accuracy
()
ε
'
rm
∆
ε
'
rm
AZ + 0.04 f
2
ε
'
rm
ε 0 +
π
2
d
t
2
100 (ε
'
rm
– 1)
(
ε
'
rm
–
)
t
0.01
[%]
π
2
d
t
2
E
a
= 0.005 + 0.0004 f
2
ε
'
rm
ε
0
E
b
=
100
tan δ
ε
'
rm
∆
ε
'
rm
tan 
*LossangentAccuracytan
tan < 0.1 : Ad + Ea + Eb
4294A Measurement Settings;
1. Osc level : 500 mV
2. BW: 5
3. Adapter setup : 1 m
4. Compensation : Open, short and load