Philips PM 3266 - 2.1.1. Installation; 2.1.2. Removing and fitting the front cover; 2.1.3. Mains adjustment and fuse; 2.1.4. Earthing

21
2.
Operating
manual
2.1.
GENERAL
INFORMATION
This section
outlines
the procedures
and precautions
necessary for installing
the
PM
3266,
identifies and briefly
describes the
functions of
the
front and
rear panel
controls and indicators,
and explains
the practical
aspects of
operation
to
enable an operator to
evaluate
quickly
the
instrument's
main functions.
2.1.1.
Installation
Before any
other connection
is made,
the protective
earth
terminal shall be
connected to a
protective
conductor
(see
section
EARTHING).
WARNING:
The opening
of covers
or removal
of parts, except
those
to
which access
can be gained by
hand,
is
likely
to
expose live
parts and
accessible
terminals,
which
can
be
dangerous
to
life.
The
instrument
shall be
disconnected
from all
voltage sources
before any
adjustment,
replacement or
maintenance and
repair is effected
with the
instrument
open.
If afterwards any
adjustment,
maintenance or
repair
of the
opened
instrument under
voltage is
inevitable, it
shall be carried
out only by a
skilled
person who
is
aware of the
hazard involved. Bear in
mind that
the capacitors
inside
the
instrument may still
be charged
even if the
instrument has
been separated
from all voltage
sources.
2.1.2.
Removing and
fitting the
front cover
(see Fig. 2.1.)
Removing:
—
Rotate
the knob
in the
centre of
the cover
a
quarter-turn
anti-clockwise to
UNLOCKED
position.
—
Remove the cover
Fitting:
—
Rotate
the knob to
the
UNLOCKED
position
—
Fit the
cover over the
front of
the oscilloscope.
—
Press and rotate the
knob
a
quarter-turn
clock-wise to
LOCKED
position.
Note:
The handle
can be rotated
if the push-buttons
on its
bearings are
depressed.
2.1.3.
Mains
adjustment and
fuse
The ability of
the
instrument to
operate at
any
mains
voltage
between
90
V
and 140
V
(with mentioned
voltage
rate
on
CIRCUIT
BREAKER
visible) and
between
200
V and
264
V
(link
reversed)
(also
visible
through
the
window at
the rear),
obviates
the
need
to
adapt
the
instrument to
the
local mains,
once
the relevant
supply
range
has been
established.
The
fuse-holder,
which is
mounted on
the rear
panel,
carries
a
2
A delayed
action fuse.
Ensure
that
only
fuses
with the
required rated
current and
of the
specified type
are
used
for
replacement.
The use
of
mended
fuses and
the
short-circuiting
of
fuse-holders
shall be
avoided.
This
instrument
shall
be
disconnected
from
all
voltage
sources
when
a
fuse is to be
replaced.
Note:
For
the setting
90
V ...
140 V
as
well as
the
setting 200 ...
264 V
the same 2 A
delayed
action fuse is
used.
2.1.4.
Earthing
Before
switching
on, the
instrument
shall be
connected to a
protective
earth conductor
in one
of the
following ways:
—
via the
protective
earth terminal at
the
rear
(identified
by
the
symbol
);
—
via the
earth wire
in three-core
mains
cable.
The
mains plug
shall only
be inserted
in
a
socket
outlet
provided with
a
protective
earth
contact.
The
protective action shall not be
negated by
the use of
an extension
cord
without
protective
conductor.
Replacing the
mains plug is at the
user's own
risk.
WARNING: Any
interruption
of the
protective
conductor inside or outside
the instrument,
or
disconnection
of the
protective earth
terminal is likely to
render the
instrument
dangerous.
Intentional
interruption is
prohibited.
When an
instrument is brought
from a
cold
to a
warm
environment,
condertsation
may
cause
a
hazardous
condition.
Ensure,
therefore,
that the earthing requirements are strictly
adhered
to.