18.
Record
this
measurement
value
as
C
s
2
.
19.
Remove
the
test
material
carefully
and
measure
the
capacitance
of
the
air
gap
.
20.
Record
this
measurement
value
as
C
s
1
.
21.
Y
ou
can
obtain
the
dielectric
constant
(
r
)
using
the
following
equation:
(Refer
to
\Non-contacting
Electrode
Method
(Air
Gap
Method)"
in
\Measurement
Method")
r
=
1
1
0
1
0
C
s
1
C
s
2
2
t
g
t
a
F
or
example
,
C
s1
=
4.055
pF
,
C
s2
=
6.780
pF
,
t
a
=2.01
mm
and
t
g
=
2.20
mm
then
the
calculated
dielectric
constant
r
is
2.00.
Note
The
\Sample
Program
for
the
4284A"
in
Appendix
D
lists
a
sample
B
ASIC
program
that
runs
on
the
9000
series
300
Engineering
W
orkstation.
The
sample
program
controls
the
4284A
via
GPIB
and
automatically
performs
the
following
operation
procedure
.
F
or
more
information
on
the
4284A,
such
as
GPIB
commands
,
refer
to
the
4284A
Operation
Manual.
3-56
Operation
Содержание 16451B
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