Tektronix 442, Инструкция по эксплуатации

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Operating Instructions—442 Service
Figure 2-3. Power input fuse location on the 442 back panel.
C O N T R O L S ,
CONNECTORS,
A N D
INDICATORS
Introduction
The following information will familiarize an operator
with the location and operation of external controls,
connectors, and indicators. These controls, connectors,
and indicators are accessible from outside the instrument
with its cabinet in place. Internal controls should not be
adjusted except during instrument calibration and ser­
vice. Calibration and service procedures must be referred
to qualified personnel.
Figure 2-4. Crt Display and Power front panel controls and
connectors.
@ BEAM FINDER
Spring-loaded push-button switch to locate off­
screen displays. When the BEAM FINDER button
is pressed in, the crt display is electrically com­
pressed to within the graticule area, independent
of position control settings or applied signals. To
locate an off-screen display:
a. Set vertical POSITION and INTENSITY con­
trols to midrange and rotate the horizontal
POSITION control fully clockwise.
Crt Display and Power
(Front Panel. See Figure 2-4.)
( ? ) ASTIGmatism
Recessed screwdriver control used in conjunc­
tion with the FOCUS control to obtain a well-
defined display. It does not require readjustment
during normal operation of the 442.
( T ) INTENSITY
Turn control clockwise to increase display
brightness. Set for lowest visible display to
prolong crt life.
(T ) FOCUS
Provides adjustment for optimum display defini­
tion when INTENSITY and sweep speed settings
are changed significantly (also see ASTIG).
b. If a display or dot still is not visible, press
BEAM FINDER and hold in. A compressed dis­
play or dot should appear. If not, increase
INTENSITY until a dot or display appears.
If a dot or vertical line appears, the sweep is not
triggered. Set trigger MODE switch to AUTO and
obtain a display. Center the display with vertical
and horizontal POSITION controls. Release
BEAM FINDER push button and adjust trigger
LEVEL control for a stable display.
After releasing BEAM FINDER, adjust INTENSI­
TY, FOCUS, VOLTS/DIV switch, horizontal, and
vertical POSITION controls for a viewable stable
display.
( ? ) TRACE ROTation
Recessed screwdriver adjustment aligns crt trace
with horizontal graticule lines.
REV A MAY 1980
2-3