Section
2-2445A/2455A
Service
OPERATING INFORMATION
SAFETY
Before connecting the oscilloscope to a power source,
read
entirely both this section
and
the
Safety Summary at
the front of this manual.
Be
sure
you
have
the
training
required
to
safely connect the instrument inputs to the sig-
nals you will
be
measuring. Refer to the Safety Summary
for
power
source, grounding,
and
other
safety
considera-
tions pertaining to the
use
of the instrument.
CAUTION
This
instrument may be damaged
if
operated with
the
LINE VOLTAGE SELECTOR switch set for the
wrong applied ac input-source voltage
or
if
the
wrong line
fuse
is
installed.
LINE VOLTAGE SELECTON
The
oscilloscope operates from either a 115-V or a
230-V nominal
ac
power-line with
any
frequency from
48
Hz
to 440
Hz.
Before connecting the power cord to a
power source, verify that the
LINE
VOLTAGE SELECTOR
switch, located
on
the rear
panel
(see
Figure
2-1
),
is set
correctly
(see
Table
2-1)
and
that
the
line
fuse is correct.
To convert
the
instrument for operation
on
the other line-
voltage
range,
move the
LINE
VOLTAGE SELECTOR
switch to the correct nominal
ac
source-voltage setting.
The
detachable power cord
may
have
to
be
replaced to
match the particular power source.
LINE FUSE
To verify the instrument power-input fuse rating, do the
following steps:
1.
Press
in
the fuse-holder cap
and
release
it with a
slight counterclockwise rotation.
Pull
the cap
(with the attached fuse
inside)
out of the fuse
holder.
2.
Verify that
the
fuse
is
of the type listed
on
the
back of the instrument.
Then
install the proper
fuse
and
reinstall the proper fuse-holder cap.
The
two types of fuses listed
are
not directly inter-
changeable; they require different types of fuse
caps. Included
in
the accessory pouch
is
a
5x20
mm
fuse holder cap for
use
with 1.6
A,
250
V,
5x20
mm
(IEC
127)
fuses.
POWER CORD
This instrument has a detachable, three-wire power
cord with a three-contact
plug
for connection to both the
power source
and
protective ground.
The
power cord is
secured to the rear
panel
by a cord-set-securing clamp.
The protective-ground contact
on
the
plug
connects
through the power-cord to the external metal parts of the
instrument. For electrical-shock protection, insert this
plug
into a power-source outlet that
has
a property grounded
protective-ground contact.
Instruments
are
shipped with the required power cord
as
ordered by the customer. Available power-cord informa-
tion
is
presented
in
Table
2-1,
and
part numbers
are
listed
in
"Options
and
Accessories· (Section
7).
Contact your
Tektronix representative or local Tektronix
Field
Office for
additional power-cord information.
INSTRUMENT COOLING
To prevent instrument damage from internally gen-
erated heat, adequate air flow must
be
maintained. Before
turning
on
the power, verify that the spaces around the
air-intake holes
on
the bottom of the cabinet
and
the fan-
exhaust holes
in
the rear panel are free of any obstruction
to airflow.
OPERATING INFORMATION
All
operating information pertaining to the use of these
instruments
is
found
in
the respective instrument Opera-
tors Manual.
2-1
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