PRECAUTIONS
SAFETY
Before
connecting the instrument to the power
source,
care-
fully read the
following
information, then verify that the
power cord and power line fuse are ones for your power line.
The
instrument's rear panel has a fuse holder on the
left
of
the AC inlet terminal (the fuse holer also
serves
as a vol-
tage selector). The value under the triangle • marked on
the holder indicates the line voltage set for the instrument.
If the power cord is not applied
with
the correct voltage,
there is a danger
from
electric shock.
• When converting the voltage, refer to the Maintenance
section.
Line
voltage
This
instrument operates using ac-power
input
voltages that
100/120/220/240
V at frequencies
from
50 Hz to 60 Hz.
Power
cord
)
The ground wire of the 3-wire ac power plug places the
chassis
and housing of the oscilloscope at earth ground. Do
not attempt to defeat the ground wire connection or float
the oscilloscope; to do so may pose a great safety hazard.
The
appropriate power cord is supplied by an
option
that
is
specified when the instrument is ordered.
The
optional power cords are shown as follows in Fig. 1.
Line
fuse
The
fuse holder is located on the rear panel and contains
the line
fuse.
Verify that the proper fuse is installed by
replacing the line
fuse.
EQUIPMENT
PROTECTION
1.
Never allow a small spot of high brilliance to remain
sta-
tionary on the screen for more than a few
seconds.
The
screen
may become permanently burned. A spot will
occur
only when the scope is set up for X-Y operation
and
no signal is applied. Either reduce the intensity so
the spot is barely visible, switch back to normal sweep
operation when no signal is applied, or set up the scope
for spot blanking.
2.
Never cover the ventilating holes on the top of the os-
cilloscope,
as this will increase the operating tempera-
ture inside the
case.
3.
Never apply more than the maximum rating to the os-
cilloscope
inputs.
/J^CH1,
CH2
INPUT
jacks:
500 Vp-p or 250 V
(DC
+ AC peak)
EXT
TRIG
INPUT
jack: 50 V (DC + AC peak)
Z
axis
INPUT
jack: 50 V
(DC
+ AC peak)
Never
apply external voltage to the oscilloscope
out-
put terminals.
4.
Always connect a cable
from
the earth ground (GND)
jack
of the oscilloscope to the
chassis
of the equipment
under test.
Without
this caution, the entire current for
the equipment under test may be drawn
through
the
probe clip leads under certain
circumstances.
Such
con-
ditions could also pose a safety hazard, which the
ground cable will prevent.
5.
Always use the probe ground clips for best results. Do
not use an external ground wire in lieu of the probe
ground clips, as undesired signals may be introduced.
6.
Operation adjacent to equipment which produces strong
ac
magnetic fields should be avoided where possible.
This
includes such devices as large power supplies,
transformers,
electric motors, etc., that are
often
found
in an industrial environment. Strong magnetic shields
can
exceed the practical
CRT
magnetic shielding limits
and
result interference and distortion.
7.
Probe compensation adjustment matches the probe to
the
input
of the scope. For best results, compensation
of probe should be adjusted initially, then the same pro-
be
always
used
with
the
input
of
scope.
Probe compen-
sation should be readjusted whenever a probe
from
a
different scope is
used.
(See page 21)
8.
In X-Y operation, do not
pull
out the
PULL
x 10 MAG
switch.
If pulled out it, noise may appeare on the
waveform.
9.
When
turning
on and off the
POWER
switch repeated-
ly, keep an interval of about 5 seconds.
Faster
on and
off operation may
cause
malfunction to the instrument.
10.
Do not use the provided
PC-33
Probe
with
other
meas-
uring equipment because it incorporates a terminal for
READOUT
detection which
might
damage the other
equipment.
7
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