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S A F E T Y
Before connecting the instrument to a power source,
carefully read the following information, then verify that
the proper power cord is used and the proper line fuse is in-
stalled for power source. If the power cord is not applied
for specified voltage, there is always a certain amount of
danger from electric shock.
Line voltage
This instrument operates using ac-power input voltages
that 90 V to 2 6 4 V at frequencies from 4 5 Hz to 4 0 0 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 oc-
cur 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
oscilloscope,
as
this
temperature inside the case.
3. Never apply more than the maximum rating to the
oscilloscope inputs.
C H 1 , CH2 INPUT jacks: 500 Vp-p or 250 V (dc + ac
peak)
EXT TRIG INPUT jack: 2 5 0 V (dc + ac peak)
Z axis INPUT jack: 50 V (dc + ac peak)
Never apply external voltage to the oscilloscope output
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.
6
PREPARATION FOR USE
will
increase the
operating
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 C R T 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.
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