Agilent Technologies 4395A - Page 253

Typical
Impedance
Measurement
Techniques
Typical Impedance
Measurement T
echniques
This
section
describes
typical
impedance measurement
techniques.
The topics
covered include:
Applying
DC
bias
Equivalent
circuit
analysis
Determining
Q
value
using
the width
search function
P
ort
extension
Applying
DC
Bias
The
4395A
option
001
DC
source
can
be
used
to
supply
up
to
6 40
V/
6 100
mA of
DC
voltage/current
to
external
circuit
or
DUT
through
the
DC
SOURCE
port
on
the
front
panel.
This
section
explains
how
to
supply
DC
bias
to
the
DUT
on impedance
measurement mode
.
1.
Make
sure
that
the
4395A
's
DC
SOURCE
port
is
inactive.
(The softkey
label under
4
Source
5
should
be
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
DC
OUT
on
OFF
.)
2.
Connect
a
BNC cable
between
the
DC
SOURCE
port
and
the
impedance
test
kit's
DC
SOURCE
INPUT
port
(see
Figure
8-30
).
The
4395A
can
apply
DC
voltage
bias
up
to 6
40V or
dc current
bias up
to
6
20
mA.
Figure 8-30. Connecting DC SOURCE to Impedance test kit
Caution
Do not attempt to perform calibration or xture compensation while the
4395A is applying DC bias. Doing so could damage the calibration or xture
compensation standard.
Analyzing the Measurement Results 8-51