WARNING
High voltage is present inside this instrument. To
avoid electric-shock hazard, operating personnel
must not remove the protective instrument
cover. Component replacement and internal ad
justments must be made by qualified personnel
only.
In the ac power source mode, the 305 DMM Oscillo
scope operates from a single phase power source, which
has one of its current carrying conductors at ground (earth)
potential. Operation from other power sources where both
current carrying conductors are live with respect to ground
(such as phase-to-phase on a multi-phase three wire system I
is not recommended because only the line conductor has
over-current (fuse) protection within the instrument.
This instrument has a 3-wire power cord with a 3-
contact plug for connection to the power source and to
protective ground. The plug protective-ground contact con
nects (through the cord protective grounding conductor) to
the accessible metal parts of the instrument. For electric-
shock protection, insert this plug into a socket outlet that
has a securely grounded protective-ground contact.
L)o not defeat the grounding connection. Any interrup
tion o f the grounding connection can create an electric-
shock hazard. Before making external connections to this
instrument, always ground the instrument first by connect
ing the power cord to a proper mating power outlet, that
is known to be properly grounded.
OPERATING VOLTAGE
This instrument may operate from an external dc source,
rechargeable batteries (supplied with the instrument), or a
115 or 230 volt ac nominal line voltage.
External DC Power Source Operation
The 305 can operate from an external dc power source
of +9 to +32 volts. Set the Power Source Selector switch to
the EXT DC position (Figure 1). Apply external dc voltage
to the two banana jack inputs using the cable assembly
supplied with the instrument.
Internal Battery Power Source Operation
To operate the instrument from the internal battery
source, set the Power Source Selector switch to the BAT
TERY position (Figure 1). Battery voltage is indicated on
the DMM digital readout when all DMM FUNCTION push
buttons are in the out position.
2
305 Operators
REV A SEP 1979
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