OPERATING
INSTRUCTIONS
Operating Voltage
Before applying power
to
the instrument, check
that
the
indicating tabs
on
the switch bars
are
protruding through
~
the correct holes
for
the
desired nom inal line voltage and
regu
lating range.
This
instrument
is designed
for
operation
from
a
power
source
with
its
neutral
at
or
near earth
CONTROLS
AND
CONNECTORS
(ground)
potential
with
a separate safety-earth con-
Cathode-Ray Tube
ducter.
It
is
not
intended
for
operation
from
two
phases
of
a multiphase system,
or
across the
legs
of
a
FOCUS
Provides adjustment
for
optimum
single-phase three-wire system;
display
definition.
The
454A
can
be
operated
from
either a 115-volt
or
a
BANDWIDTH-BEAM
Three position switch which pro-
230-volt nomihal line voltage source. The
t Line Voltage
FINDER
vides bandwidth
limiting
and
beam
Selector assembly on the rear panel converts this instru-
location.
ment
from
one operating voltage
to
the other. This
assem-
bly also includes the fuses
that
provide protection
for
the
20
MHz: Vertical
Amplifier
band-
line-input
portion
of
the instrument.
To
convert
from
width
limited
to
provide a
re-
115-volt
to
230-volt
nominal lil'le voltage, or vice versa,
duction
in displayed
noise
or
in-
remove the cover
from
the Line Voltage Selector assembly.
terference.
Then, pull
out
the Selector switch
bar
and' plug
it
back
into
FU
LL:
Normal operation
with
full
the remaining holes. Change the
line"cordpower
plug
to
Ve
rtical
Amplifier
bandwidth
match the power-source receptacle
or
usea 115-
to
230-volt
capabilities.
adapter.
To
change regulating
ranges,
pull
out
the
Range
Selector switch bar, slide
it
to
the desired position and plug
BEAM
FINDER:
Compresses dis-
it
back in. Select a range which
is
centered about the aver-
play
within
graticule
a~ea,
inde-
age
line voltage
to
which the instrument
is
to
be
conn'ected.
pendently
of
display position
or
'Replace the cover and tighten the
two
captive screws.
applied signals.
®
454A
5
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