Model
2148
Adjustme
nt
s
SECTION V
ADJUSTMENTS
5-1
INTRODUCTION
5- 2
This
section describes
the
adjustments
which
will
return
the
instrument
to
peak
operating
condition
after
repairs are
completed.
5-3
SAFETY CONSIDERATIONS
5- 4
Although
this
instrument
has been designed in
accordance
with
international safety
standards,
this manual
contains
information,
cautions,
and
warnings which
must
be
followed
to
ensure
safe
operat
i
on
and
to
retain
the
instrument
in safe
condition
(see
Sections"
and"
I) .
Service
and
adjustments
should be
performed
only
by
qualified service personnel.
WARNING I
Any
interruption
of
the protective (grounding)
conductor (inside or outside the instrument or
disconnection
of
the protective earth terminal
is
likely to make the instrument dangerous.
Intentional interruption
is
prohibited.
5- 5
Any
adjustment
,
maintenance,
and
repair
of
the
opened
instrument
with
voltage
applied
should
be avoided
as
much
as possible
and
,
when
inevitable, should be carried
out
only
by
a skilled person who
is
aware
of
the
hazard
involved.
5-6
Capacitors
inside
the
instrument
may
still be
charged even
if
the
instrument
has been
disconnected
from
its source
of
supply.
5- 7 Make sure
that
only
fuses
with
the
requ ired
rated
current
and
of
the
specified
type
(normal blow,
time
delay,
etc.) are used
for
replacement
.
The
use
of
repaired fuses
and
the
shortcircuiting
of
fuseholders
must
be avoided.
5- 8 Whenever it
is
I ikely
that
the
protection
offered
by
fuses has
been
i
mpaired
,
the
instrument
must
be made
inoperative
and
secured against
any
unintended
operation.
f I WARNING I 7
Adjustments described herein
are
performed
with power supplied to the instrument while
protective covers
are
removed. Energy available
at many points may,
if
contacted, result
in
personal
injury or death.
5-9
EQUIPMENT REQUIRED
5- 10
The
test
equipment
required
for
the
adjustment
procedures
is
listed in
Table
1-1,
Recommended
Test
Equipment
.
The
critical specifications
of
substitute
test
instruments
must
meet
or
exceed
the
standards
listed in
the
table
if
the
instrument
is
to
meet
the
standards
set
forth
in
Table
1-2,
Specifications.
5-1
Scans by Artekmedia => 2009
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