400
Hz
Option
The
HP
70001A
Mainframe
is
available
with
an
option
that
allows
it
to
operate
on
a
power-line
frequency
of
400
Hz.
The
400
Hz
option
comes
with
an
external
in-line
600
V-A
isolation
transformer
that
must
be
used
when
the
instrument
uses
a
400
Hz
power
source
.
W
ARNING
Never
operate
a
400
Hz
option
instrument
on
a
400
Hz
power
line
without
using
the
in-line
isolation
transformer
supplied
for
this
purpose
.
F
ailure
to
follow
this
precaution
can
create
a
shock
hazard
which
may
result
in
personal
injury
.
The
in-line
isolation
transformer
must
be
removed
from
the
400
Hz
option
for
50/60
Hz
power
source
operation.
F
ailure
to
remove
the
in-line
400
Hz
transformer
will
result
in
the
400
Hz
transformer
input
fuse
.
When
the
isolation
transformer
is
removed,
a
standard
power
cord
must
be
used.
The
in-line
transformer
must
be
reinstalled
when
using
a
400
Hz
power
source
,
in
order
to
protect
the
user
from
electric
shock
hazard.
Fuse
Replacement
The
line
fuse
for
this
instrument
is
located
inside
the
power
cord
receptacle
housing
on
the
back
of
the
instrument.
Also
included
in
this
housing
is
a
spare
fuse
.
The
fuse
is
a
5
by
20
mm
fuse
rated
at
6.3
A,
250
V
,
HP
part
number
2110-0703.
Refer
to
Figure
2-2
for
fuse
removal
and
replacement.
Figure
2-2.
Line
Fuse
Removal
and
Replacement
Installation
2-3
