Atec Agilent-16047A - Manual (Page 48)

Up to 110 MHz (4-Terminal Pair) Material
43
Compensation and Measurement: Open (Air-Capacitance)
and short compensations are recommended in combination with
the cable length compensation before measurement. First, set
the instrument's cable length compensation function to 1 m.
Then, short compensation is performed by using the furnished
shorting plate. Open compensation is not performed, but its val-
ues are used in the dielectric constant equation as shown below:
Cp 1
ε
r
=
α
(—— – j ———— )
Co
ω
CoRp
α
: : Correction coefficient
ε
r
: Relative dielectric constant
Cp : Liquid capacitance (measurement data)
Co : Air capacitance (measurement data) or open compensation data
Rp: Equivalent parallel resistance (measurement data)
ω
: Angular frequency (
ω
=2
π
f)
The following figures below show how compensation and mea-
surement is performed.
Note: the 16452A is not capable of measuring salt or ionic solu-
tions or other liquids with bulk conductivity due to the electrode
polarization phenomenon.
Test fixture overview
Short compensation
Method of connection
Pouring the liquid into the fixture
Fixture materials
Electrode: Ni plated Cobal
(Fe 54%, Co 17%, Ni 29%)
Insulator: Alumina (Al
2
O
3
)
O-ring: Viton (Fluro rubber)