Tektronix 7834

Trace Alignment
11 . Disconnect the input signal . Use the left amplifier
position control to align the trace with the center horizontal
graticule line . If necessary use the TRACE ROTATION
control to align the trace with the center graticule line .
Graticule
Illumination
12 . Rotate the GRAT ILLUM control throughout its range
and notice that the graticule lines are illuminated as the
control is turned clockwise .
Control Illumination
13 . Notice
that
the
A INTENSITY indicator and the
lighted push-button
switches are illuminated . Sequentially
press all
of the HORIZONTAL MODE switch positions and
notice
the A and B INTENSITY lights ; these lights indicate
which intensity control
is active . Set the CONTROL
ILLUM switch to the MEDIUM
position . Observe that the
selected intensity indicator and the lighted
push-button
switches on the plug-in units are dimmed .
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
output to 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 2 divisions of
signal on the crt .
16 . Notice that the position control of only
the left
amplifier unit affects the vertical position
of the displayed
trace . Position the trace to the upper half
of the graticule .
17 . Set the VERTICAL MODE switch to RIGHT .
Set the
deflection factor of the right amplifier
unit to display about
2 divisions of signal on the
crt .
18 . Notice that the position control of only the right
amplifier unit affects the vertical position of the displayed
trace . Position the trace to the lower half of the graticule .
19 . Set the VERTICAL MODE switch
to ALT . Notice that
2 traces are displayed on the crt . The top
trace is produced
by the left amplifier unit and the bottom trace
is 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 ; notice
that
the
display alternates between the left and right amplifier plug-
in units after each sweep . Turn the A time-base sweep rate
switch throughout its range ; notice that the display
alternates between amplifier units at all sweep rates .
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
display should be four divisions in
amplitude . Notice that
the position control of either
amplifier unit moves the
display . Set the
VERTICAL
MODE
switch to LEFT .
Horizontal Deflection System
Operating Instructions-7834
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 the left graticule line
with the A time-base unit
position control
.
23 . Set the HORIZONTAL MODE switch
to
B . Advance
the B INTENSITY control until the display becomes
defocused . The defocused display indicates that the B
INTENSITY control is set too high . Reduce the setting
of
the B INTENSITY control to obtain
a
bright,
well-defined
display .
24 . Notice that the position control of only the B time-
base unit affects the horizontal position
of
the
displayed
trace . Position the start of the trace
to the left graticule line
with the B time-base unit position
control
.
25 . Set the HORIZONTAL MODE switch to ALT . Two
traces should be presented on the crt
.
If the traces overlap,
adjust the VERT TRACE
SEPARATION (B) control to
position one trace to the
bottom of the graticule area . Turn
the sweep rate switches
of both time-base units throughout
their range . Observe that each time-base unit
controls one
of the traces independently of the other time-base unit
.
Also notice that when one of the time-base units
is set to a
slow sweep rate (below about
50 milliseconds/division),
sweep
alternation is evident (only 1 of the traces is
presented on the crt
at a time) . Set the sweep rates of both
time-base units to
0 .5 millisecond/division . Adjust the
A INTENSITY control ;
notice that it changes the intensity
of the trace produced by the
A time-base unit only . Like-
wise, the B INTENSITY control changes the intensity
of
the
trace produced by the B time-base unit only . Return
both intensity controls to desirable levels .
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