Section 2—2465B/2467B Service
OPERATING
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.
777/s 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 SELECTION
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 1-1) 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.
INFORMATION
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 (I EC 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 properly 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
2-1
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