HP 436A - Adjustments; Safety Considerations; Equipment Required

•
Model
436A
Adjustments
SECTION
V
ADJUSTMENTS
5-1.
INTRODUCTION
5-2. This section describes
the
adjustments which
will
return
the
Power Meter
to
peak operating
condition after repairs are completed.
5-3.
If
the
adjustments are
to
be considered valid
'
the
Power Meter must have a half-hour warmup
and
the
line voltage
must
be within +5
to
-10%
of
nominal.
5-4. SAFETY CONSIDERATIONS
5-5. 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
operation and
to
retain
the
instrument in safe
condition (see Sections II .and III). Service and
adjustments should be performed only by qualified
service personnel.
I
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.
5-6. Any adjustment, maintenance, and repair
of
the
opened instrument with voltage applied should
be
avoided as much as possible and, when inevit-
able, should be carried
out
only
by
a skilled person
who
is
aware
of
the hazard involved.
5-7. Capacitors inside
the
instrument may still be
charged even
if
the instrument has been discon-
nected from its source
of
supply.
5-8. Make sure
that
only fuses with
the
required
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.
5-9. Whenever
it
is likely
that
the
protection
offered
by
fuses has been impaired,
the
instrument
must
be made inoperative and secured against any
unintended operation.
I
WARNING
I
Adjustments described herein
are
per-
formed with power supplied to the instru-
ment
while protective covers
are
removed.
Energy available
at
many points may,
if
contacted, result
in
personal injury.
5-10. EQUIPMENT REQUIRED
5-11. The
test
equipment required
for
the adjust-
ment
procedures
is
listed in Table 1-2, Recom-
mended Test Equipment. The critical specifications
of
substitute
test
instruments
must
meet
or exceed
the
standards listed in
the
table if
the
Power Meter
is
to
meet
the
standards set forth in Table 1-1,
Specifications.
5-12. FACTORY SELECTED
COMPONENTS
5-13. Factory selected components are indicated
on
the
schematic and replaceable
parts
list with an
asterisk immediately following the reference desig-
nator.
The nominal value
of
the
component
is
listed. Table 5-1 lists the parts
by
reference
designator
and
provides an explanation
of
how
the
component
is selected,
the
normal value range, and
a reference
to
the
appropriate service sheet. The
Manual Changes supplement will update any
changes
to
factory selected
component
information.
5-14.
ADJUSTMENT LOCATIONS
5-15. Each
of
the
adjustments are shown
on
the
component
locator
photographs
that
are
part
of
the
Service Sheets.
5-1