Tektronix 442, Инструкция по эксплуатации

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Section 2—442 Service
OPERATING INSTRUCTIONS
INTRODUCTION
The TEKTRONIX 442 Oscilloscope is a 35 MHz maximum bandwidth instrument with dual trace capability. A dual
trace dc to 35 MHz vertical system provides calibrated deflection factors from 2 mV/divto 10 V/div. Triggering circuits
provide stable triggering over the full vertical bandwidth. A horizontal deflection system provides calibrated sweep rates
from 0.5 s/div to 0.1 //s/div. A X10 magnifier circuit (push-button switch) extends maximum sweep to 10 ns/div. In X-Y
mode of operation, vertical and horizontal deflection factors are the same as for the vertical amplifiers.
INSTALLATION
Unpacking
The 442 is shipped in its carton with the standard
accessories listed on the Accessories tab page at the end
of this manual. At installation time, save the shipping
carton and packaging materials for repackaging. Refer to
the end of this section for repackaging information.
Line Voltage Selection
W A R N I N G !
This instrument is designed for operation from a
power source with its neutral at or near earth
(ground) potential with a separate safety-earth
conductor.
Safety Considerations
This instrument may be damaged if operated with
the Line Voltage Selector switch or the Regulating
Range Selector switch set for the wrong applied line
voltage or if the wrong line fuse is used.
Refer to the Safety Summary in the front of this manual
for power source, grounding, and other safety con­
siderations pertaining to use of the instrument. Before
connecting the instrument to a power source, verify that
the Line Voltage Selector switch and the Regulating
Range Selector switch are both set for the line voltage
being used, that the proper line fuse is installed, and that
the line cord plug matches the power source to be used.
The 442 is designed to be used with a three-wire ac
power system. If a 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, thus posing a shock hazard.
The power cord plug may require replacement with a
type matching the power source. If necessary, changethe
line cord plug. Refer to Table 2-1 for power cord conduc­
tor identification and to Figure 2-1 for illustrations of
commonly-used power plugs.
Table 2-1
POWER CORD CONDUCTOR IDENTIFICATION
Conductor Color
Alternate
Color
Ungrounded (Line)
Brown Black
Grounded (Neutral) Blue White
Grounding (Earthing)
Green-Yellow Green-Yellow
The 442 operates from either 92 to 132 V or 202 to 250 V
ac input at 48 to 62 Hz. A 120 or 240 V Line Voltage
Selection switch and aHI/LO Regulating Range switch are
located on the bottom of the instrument and are screw­
driver actuated through openings in the cabinet.
REV A MAY 1980
2-1