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Section
1.
General Information
INTRODUCTION
This
manual
contains the information required
to
install,
operate,
test,
adjust,
and
service the
HP
85027D
directional
bridge
{also referred to
as
the "bridge").
The
bridge
and
supplied accessories are
shown
in
Figure
1-1.
Listed
on
the
title
page
of
this
manual
is
a microfiche
part
number.
Use
this
number
to
order
microfilm
transparencies
of this
manual.
The
latest
manual changes supplement and
relevant service
notes are
included
in
the microfilm
package.
INSTRUMENTS
COVERED
BY THE
MANUAL
A
serial
number
label
is
attached
to
the side of the
HP85027D
(see
Figure
1-2).
The
serial
number
Is in
two
parts.
The
first
four
digits
followed by a
letter
comprise
the
serial
number
prefix;
the
last five digits
are
the
suffix.
The
prefix
is
the
same
for
all
identical
instruments.
The
prefix
changes
only
when
a
change
is
made
to
the instrument.
The
suffix
is
assigned
sequentially
and
is
different for
each
instrument.
The
content
of
this
manual
applies
directly
to
HP85027D
directional
bridges having
the
same
serial
number
prefix
as those
listed
under
Serial
Numbers
on
the
title
page
of
this
manual.
A
bridge
manufactured
after
the
printing of this
manual
may
have
a
serial
prefix that
is
not
listed
on
the
title
page.
An
unlisted
serial prefix
indicates that
the
product
may
be
different
from
those
documented
in
this
manual.
A
manual changes supplement
will
be
included
with the
manual
to
document
differences.
In
addition to
change
information, the
supplement
may
contain information
that applies to
all
instru-
ments,
regardless
of
serial
number.
To
keep
this
manual
as
current
as
possible,
periodically
request
the
latest
manual changes
supplement.
The
supplement
for
this
manual
is
keyed
to
its
print
date
and
part
number, which appear
on
the
title
page.
Copies
of
the
supplement
are
available
from
Hewlett-
Packard.
Figure
1-2.
Typical Serial
Number
Label
INSTRUMENT KEYS/SOFTKEYS
This
manual
contains step
by
step
performance
instructions
for
specific tests
and measurements.
Instrument keys are
Identified
with
BOLD
type
and
softkeys are
differentiated with
BOLD UAUCS.
HP
85027D
General Information
1-1
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