HP 8753D - Page 246

Matched
A
dapters
With
this
method,
you
use
two
precision
matched
adapters
which
are \equal."
To
be equal,
the
adapters
must
have
the
same
match,
Z
0
,
insertion
loss
,
and
electrical
delay
.
The adapters
in
most
HP
calibration
kits
have
matched
electrical
length, even
if the
physical lengths
appear
dierent.
Figure
5-10.
Calibrating
for
Noninsertable
Devices
T
o
use
this method,
refer to
Figure
5-10
and
perform
the
following
steps:
1.
P
erform
a
transmission
calibration using
the
rst
adapter
.
2.
Remove
adapter
A,
and
place
adapter B
on
port
2.
A
dapter
B
becomes
the
eective
test
port.
3.
P
erform
a
reection
calibration.
4.
Measure the
test
device
with
adapter
B
in
place
.
The
errors remaining
after calibration
with
this
method
are
equal
to
the
dierences
between
the
two adapters
that are
used.
Optimizing Measurement Results 5-39