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Display Focus
10. Rotate the FOCUS control and observe the square-
wave display. Notice that the thickness of the trace varies
as the FOCUS controlis rotated. Set the FOCUS conirolfor
a well-defined trace. If a well-defined trace cannot be ob-
tained, adjust the ASTIG screwdriver adjustment along with
the FOCUS conirol for the best trace.
Trace Alignment
11. Disconnect the input signal. Use the left amplifier
unit position control to align the trace with the center hori-
zontal graticule line. lf necessary set the TRACE ROTA-
TION adjustment so the trace is parallel to the center
graticule line.
Graticule IMumination
12. Rotate the GRAT ILLUM control throughout its
range and notice that the graticule lines are illuminated as
the contro! is turned clockwise.
Control illumination
13. Set the rear-panel
CONTROL
ILLUMINATION
switch to HIGH. Notice that the A INTENSITYindicator and
the lighted pushbutton switches are illuminated. Sequen-
tially press all of the HORIZONTAL MODE switch positions
and notice the A and B INTENSITYlights; these lights indi-
cate which intensity control is active. Set the CONTROL
ILLUMINATION switch to the MEDIUM position. Observe
that the selected intensity indicator and the lighted push-
button switches on the plug-in units are dimmed. Set the
CONTROL ILLUMINATION switch to OFF and notice that
the selected intensity indicator and pushbutton switches are
extinguished.
14, Set the rear-panel CONTROL ILLUMINATION
switch to the HIGH position. Return the HORIZONTAL
MODE switch to A.
Vertical Deflection System
15, Connect the 4 V CALIBRATOR outputto the input
connectors of both amplifier units with two 42-inch BNC
cables and a BNC T connector. Set the deflection factor of
the left amplifier unit to display about two divisions of signal
on the screen.
16. Notice that the position controlof only the left ampli-
fier unit affects the vertical position of the displayed trace.
Position the trace to the upper haif of the graticute.
Operating instructions—7934 Operator's
17, Set the VERTICAL MODE switch to RIGHT. Set the
deflection factor of the right amplifier unit to display about
two divisions of signal on the screen.
18. Notice that the position control of only the right am-
plifier unit affects the vertical position of the displayed trace.
Position the trace to the lowerhalf of the graticule.
19. Set the VERTICAL MODE switch to ALT. Notice
that two traces are displayed on the screen. The toptrace is
produced by the left amplifier unit and the bottom traceis
produced by the right amplifier unit; the sweep for both
traces is produced by the A time-base unit. Set the sweep
rate of the A time-base unit to 50 milliseconds/division; no-
tice that the display alternates between the left and right
amplifier plug-in units after each sweep. Turn the A time-
base sweeprate switch throughoutits range; notice that the
display alternates between amplifier units at all sweeprates.
20. Set the VERTICAL MODE switch to CHOP. Turn the
A time-base unit sweep rate switch throughout its range.
Notice that a dual-trace display is presented at all sweep
rates, and that both amplifier units are displayed by the A
time-base unit on a time-sharing basis. Set the A time-base
unit sweep rate switch to 0.5 millisecond/division.
21. Set the VERTICAL MODE switch to ADD. The dis-
piay shouid be four divisions in amplitude. Notice that the
position control of either amplifier unit moves the display.
Set the VERTICAL MODEswitch to LEFT.
Horizontal Deflection System
22, Notice that the position control of only the A time-
base unit affects the horizontal position of the displayed
trace. Position the start of the trace to theleft graticule line
with the A time-base unit position control.
23. Set the HORIZONTAL MODE switch io B. Advance
the B INTENSITY control until the display becomes
defocused. The defocused display indicates that the B IN-
TENSITYcontrolis set too high. Reduce the setting of the B
INTENSITY control to obtain a bright, well-defined display.
24, Notice that only the B time-base unit position control
affects the horizontal position of the displayed trace. Posi-
tion the start of the trace to the left graticule line with the B
time-base unit position control. Set the B time-base unit trig-
gering controls for a stable display.
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