Operating Voltage - Tektronix 7704A Instruction Manual

Section 1—7704A Operators
OPERATING INSTRUCTIONS
General
To effectively use this instrument, the operation and
capabilities of the instrument must be known. This section
describes the operation of the front- and rear-panel controls
and connectors and gives general operating information.
PRELIMINARY INFORMATION
Operating Voltage
The 7704A can be operated from either a 115-volt or a
230-volt nominal line voltage source. The Line Selector
assembly on the rear panel converts this instrument from
one operating voltage to the other. This assembly also
includes line fuses. Use the following procedure to obtain
correct instrument operation from the line voltage
available.
OLLI IOS
? CAUTION
This instrument is designed for operation from a
power source with its neutral at or near earth
(ground) potential with a separate safety-earth con-
ductor. It is not intended for operation from two
phases of a multi-phase system, or across the legs of a
single-phase, three-wire system.
1. Disconnect the instrument from the power source.
2. Loosen the two captive screws which hold the cover
onto the selector assembly; then pull to remove the cover.
3. To convert from 115-volts to 230-volts nominal line
voltage, or vice versa, pull out the Selector switch bar (see
Fig. 1-1) and plug it back into the remaining hole. Change
the line-cord power plug to match the power-source
receptacle or use a 115- to 230-volt adapter.
Power Cord Conductor Identification
Conductor Color Alternate Color
Ungrounded (Line) Brown Black
Grounded (Neutral) Blue White
Grounding (Earthing) |Green-Yellow | Green-Yellow
REV... C, NOV... 1976
Indicator
Tab
Captive
Screws
Selector
Switch bar
Fig. 1-1. Line Selector assembly on rear panel (shown with cover
and fuses removed).
4. Re-install the cover and tighten the captive screws.
5. Before applying power to the instrument, check that
the indicator tab on the switch bar is protruding through
the correct hole for the desired line voltage range.
s WII I TTI TIS)
3 GA UTION
This instrument may be damaged if operated with the
Line Selector assembly set to incorrect positions for
the line voltage applied.
The 7704A is designed to be used with a three-wire AC
power system. If the three- to two-wire adapter is used to
connect this instrument to a two-wire AC power system, be
sure to connect the ground lead of the adapter to earth
(ground). Failure to complete the ground system may allow
the chassis of this instrument to be elevated above ground
potential and pose a shock hazard.
1-1