Error
F
actor
using
Non-contacting
Electrode
Method
The
dielectric
constant
of
a
test
material
is
derived
from
two
capacitance
values
,
capacitance
without
a
test
material
inserted
and
capacitance
with
a
test
material
inserted,
when
using
the
Non-contacting
Electrode
method.
The
dielectric
constant
r
of
a
test
material
is
obtained
using
the
following
equation.
r
=
1
1
0
1
0
C
s
1
C
s
2
2
t
g
t
a
Where
,
C
s
1
Capacitance
without
test
material
inserted
[F]
C
s
2
Capacitance
with
test
material
inserted
[F]
t
g
Gap
between
Guarded/Guard
electrode
and
Unguarded
electrode
[m]
t
a
Thickness
of
test
material
[m]
The
error
factors
included
in
the
above
parameters
used
are
as
follows:
Capacitance
measurement
Error
This
error
is
determined
by
the
measurement
accuracy
of
LCR
meters
and
impedance
analyzers
used.
F
or
more
details
,
refer
to
\Capacitance
measurement
Error"
in
\Error
F
actor
using
Contacting
Electrode
Method".
Gap
Error
This
error
consists
of
three
factors
as
follows:
Measurement
Error
of
T
est
Material's
Thickness
(Error
caused
by
Micrometer)
:
This
error
is
included
in
thickness
(t
a
)
of
the
test
material.
Thickness
measurement
of
the
test
material
depends
on
accuracy
of
the
micrometer
used.
T
o
reduce
this
error
,
measure
the
thickness
at
several
points
of
the
measured
area
of
the
test
material
using
an
accurate
micrometer
.
Do
not
use
the
micrometer
equipped
with
the
16451B .
P
arallelism
and
Flatness
of
Electrodes
and
T
est
Materials
:
This
error
is
included
in
the
thickness
(t
a
)
of
a
test
material
and
gap
(t
g
)
between
Guarded/Guard
electrode
and
Unguarded
electrode
.
When
parallelism
and
atness
of
electrodes
of
the
test
material
are
bad,
air
lm
(gaps
between
surfaces
of
electrode
and
a
test
material)
causes
error
.
T
o
reduce
this
error
,
prepare
the
test
material
to
make
surfaces
of
the
material
parallel
and
at
and
adjust
to
make
electrode
parallel
as
accurately
as
possible
.
Error
in
Gap
between
Electrodes
:
This
error
is
included
in
the
gap
(t
g
)
between
Guarded/Guard
electrode
and
Unguarded
electrode
.
It
is
caused
by
dierence
of
scale
of
the
micrometer
from
actual
distance
between
electrodes
and
depends
on
accuracy
of
micrometer
which
set
the
gap
between
electrodes
.
T
o
reduce
this
error
,
perform
error
correction
as
follows
.
This
correction
obtains
an
equivalent
distance
error
of
electrode
gap
distance
by
comparing
the
measured
capacitance
value
of
air
gaps
3-62
Operation
Summary of Contents for 16451B
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Page 56: ...Figure 3 6 Summary of Measurement Methods 3 10 Operation ...
Page 83: ...because a change of temperature causes mechanical dimensions to change Operation 3 37 ...
Page 119: ...Figure 4 4 Cable Connection Diagram Service 4 9 ...
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