Agilent Technologies 4395A - Page 255

Typical
Impedance
Measurement
Techniques
Equivalent
Circuit
Analysis
The
4395A
provides
a
function
that
automatically
calculates
approximate
values
of specic
parameters
of
an
equivalent
circuit
that
corresponds to
aDUT
. This
function supports
ve
circuit
models
.
In
addition,
the
resulting parameter
values can
be used
to simulate
the
frequency-based
characteristics
of
the
equivalent
circuit;
this allows
you to
compare the
simulated
characteristics
with
the
actually
measured
characteristics
.
Menus
Associated
with
Equivalent
Circuit
Analysis
T
o
use
the
equivalent
circuit
analysis function,
open the
Equivalent Circuit
Menu by
pressing
4
Displa
y
5
and
choosing
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EQUIV
KIT
MENU
.
The
Equivalent
Circuit
Menu
provides
access
to
two
submenus: Select
Equivalent Circuit
Menu
and
Dene
Equivalent
Circuit
P
arameter
Menu
.
These three
menus are
described
in
this
section.
Equivalent
Circuit
Menu.
Y
ou
can
open
the
equivalent
circuit
analysis
menu
by
pressing
4
Displa
y
5
and choosing
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MORE
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EQUIV
KIT MENU
.
This
menu
provides
such
options
as
for
calculating
the
equivalent
circuit
parameters
or simulating
the equivalent
circuit's
characteristics
under
swept
frequency
.
Softkey
Label
Description
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SELECT
EQV
CKT
[
]
Opens
the
Select
Equivalent
Circuit
Menu
,
which
lets
you
to
select
one
of
the
ve
supported
circuit
models
.
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DISP
EQV
PARM [
]
Shows
or
hides
the
equivalent
circuit
constants
.
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DEFINE
EQV
PARAMS
Opens
the
Dene
Equivalent
Circuit
P
arameter
Menu
,
which
lets
you
enter
the
equivalent
circuit
parameter
values
.
N
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CALCULATE
EQV
PARAMS
Calculates
the
equivalent
circuit
parameters.
While
the
calculation
is
being
performed,
a
message
Calculating
EQV
parameters
is
displayed.
After
the
calculation is
completed, the
values
of
the
equivalent
parameters are
displayed.
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SIMULATE
F-CHRST
Simulates
the
frequency
characteristics
by
using
the
current
equivalent
circuit
parameters
and
shows
simulation
results
on
the
screen
using
memory
trace
.
In
other
words
,
simulation
results
are
stored into
the
memory
trace
.
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RETURN Returns to the previous menu.
Analyzing the Measurement Results 8-53