Tektronix 455, Instruction Manual, Page: 125 / 246

Instrument Options—455/A2/B2
OPTION 7
Option 7 permits the T ektronix 455 oscilloscope to be powered from a dc source o f 12 volts or 24 volts in addition to the
standard ac line operation. For battery operation. Option 7 makes the 455 compatible w ith the T ektronix 1106 Battery Pack.
Option 7 consists mainly o f a dc to ac inverter which is installed as an integral part o f the oscilloscope. The m odified oscillo­
scope has a two-position voltage-selector switch in place o f the push-pull power switch on standard oscilloscopes.
A dc input connector is located on the rear panel. The circu itry is protected in the event th at 24 volts should be connected
when in the 12 volt mode.
SPECIFICATIO NS
AC Requirements
AC requirements are the same as those o f oscilloscopes
w ith o u t Option 7.
12 V —Permits operation from a 12 vo lt dc source.
24 V —Permits operation o f the oscilloscope from either
an external 24 vo lt power source or from the 1106
Battery Pack, which can be fastened to the bottom of
the oscilloscope.
DC Requirements
11.5 to 14 volts or 22 to 28 volts. Voltage at + or — power
lead w ith respect to the oscilloscope chassis ground must
not exceed 50 volts.
Temperature
The same operating and non-operating range as instruments
w ith o u t Option 7.
SA FE TY C O N SID ER A TIO N S
Since Option 7 becomes a part of the instrument, safety
considerations fo r the modified oscilloscope are the same as
those fo r the standard oscilloscope.
FUNC TION S OF
CONTROLS A N D CONNECTORS
POWER AC-DC Switch (see Fig. 1) —Selects either ac or dc
voltage. With POWER switch pushed in, rotate knob clock­
wise fo r dc or counterclockwise fo r ac, then pull out to turn
on the oscilloscope.
AC—Applies ac power to the oscilloscope.
DC—Permits 12 or 24 volts dc operation o f the oscillo­
scope from an external source.
Dc Voltage Selector Switch (see Fig. 2)— Selects either 12
volts or 24 volts operation.
DC INPUT Connector (see Fig. 2)— Rear panel connector
fo r input o f dc power.
PERFO RM ANCE CHECK
Set the oscilloscope fo r the power source available as listed
in Table 1.
Connect the oscilloscope to ground (earth) reference. Turn
on the oscilloscope and check that it operates properly on
the available power sources.
Be sure to set the 1106 Line Selector switch to the correct
line voltage when charging the batteries.
REV B AUG 1979
Option 7 Page 1