HP 8753D - Page 65

The
marker annotation
tells that
the complex
impedance
is
capacitive
in
the
bottom
half
of
the
Smith chart
display
and
is
inductive
in
the
top
half
of
the
display
.
Choose
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
LIN MKR
if you
want the
analyzer
to
show
the
linear
magnitude
and
the
phase
of
the
reection
coecient at
the marker
.
Choose
N
N
N
N
NN
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
LOG
MKR
if you
want the
analyzer to
show the
logarithmic magnitude
and the
phase
of
the
reection
coecient
at
the
active
marker
.
This
is
useful as
afast
method of
obtaining
a
reading
of
the
log
magnitude
value
without
changing
to
log
magnitude
format.
Choose
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
Re/Im
MKR
if
you
want
the
analyzer
to
show
the
values
of
the
reection
coecient at
the marker
as a
real
and
imaginary
pair
.
Choose
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
R+
j
X
MKR to
show
the
real
and
imaginary
parts
of
the
device
impedance
at
the
marker
.
Also
shown
is
the
equivalent
series
inductance
or
capacitance (the
series
resistance
and
reactance
,
in
ohms).
Choose
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
G+
j
B
MKR
to
show
the
complex
admittance values
of the
active marker
in
rectangular
form. The
active marker
values are
displayed in
terms
of
conductance
(in
Siemens),
susceptance
,
and equivalent
parallel circuit
capacitance
or
inductance
.
Siemens
are
the
international
unit
of
admittance and
are
equivalent
to
mhos
(the
inverse
of
ohms).
Figure 2-12.
Example of
Impedance
Smith
Chart
Markers
To
Set
Measurement
P
arameters
Using
Markers
The analyzer allows you to set measurement parameters with the markers
, without going
through the usual key sequence
.Y
ou can change certain stimulus and response parameters to
make them equal to the current active marker value
.
2-16 Making Measurements