Display Focus; Trace Alignment; Graticule Illumination; Control Illumination - Tektronix 7140 Instruction Manual

2 . Connect the 7104 to a power source that meets the 14 . Set the rear-panel CONTROL ILLUMINATION switch
voltage and frequency requirements of this instrument . If to the HIGH position . Return the HORIZONTAL MODE
the available line voltage is outside the limits of the LINE switch to A.
VOLTAGE SELECTOR switch setting (on rear panel), see
Operating Power Information under Installation (General
Information section) .
VERTICAL DEFLECTION SYSTEM
3 . Install Tektronix 7A-series amplifier units in the LEFT
VERT and RIGHT VERT compartments . Install Tektronix
7B-series time-base units in the A HORIZ and B HORIZ
compartments .
4 . Press the POWER switch to the on (locked in) position .
5 . Set both time-base units to 1 millisecond/division and
triggering to auto mode with ac coupling from the
internal source .
6 . Rotate the A INTENSITY control until the trace is at a
desirable viewing level (near midrange).
7. Connect the CALIBRATOR output to the input of the
18 . Notice that the position control of only the right
left amplifier unit with a 42-inch bnc cable .
amplifier unit affects the vertical position of the displayed
trace . Position the trace to the lower half of the graticule .
8. Set the left amplifier deflection factor to display a
signal amplitude of 2 divisions on the crt.
19 . Set the VERTICAL MODE switch to ALT. Two traces
9. Set the A horizontal time-base triggering for a stable
should be displayed on the crt. The top trace is produced
display.
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
DISPLAY FOCUS the A time-base unit to 50 milliseconds/division ; notice
10 . Rotate the FOCUS and ASTIG controls and observe
the display alternates between the left and right amplifier
the square-wave display. Notice that the thickness of the
Plug-in units after each sweep . Turn the A time-base
trace varies . Set the FOCUS and ASTIG controls for a
sweep rate switch through its range; notice that the
well-defined trace.
display alternates between amplifier units at all sweep
rates.
TRACE ALIGNMENT
11 . Disconnect the input signal . Using the left amplifier
position control 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.
Operating Instructions-7104
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.
20 . Set the VERTICAL MODE switch to CHOP . Turn the A
time-base unit sweep rate switch throughout its range . A
dual-trace display will be presented at all sweep rates,
and 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 .
GRATICULE ILLUMINATION
21 . Set the VERTICAL MODE switch to ADD. The display
12 . Rotate the GRAT ILLUM control throughout its range should be four divisions in amplitude. Notice that the
and notice that the graticule lines are illuminated as the
position control of either amplifier unit moves the display.
control is turned clockwise. Set the VERTICAL MODE switch to LEFT.
CONTROL ILLUMINATION
13 . Set the rear-panel CONTROL ILLUMINATION switch HORIZONTAL DEFLECTION SYSTEM
to HIGH . Notice that the A INTENSITY indicator and the
22 . position the start of the trace to the left graticule line
lighted pushbutton switches are all illuminated . Sequen-
~n,ith the A time-base unit position control . Notice that the
tially press all of the HORIZONTAL MODE switch positions
position control of only the A time-base unit affects the
and notice the A and B INTENSITY lights ; these lights indi-
horizontal position of the displayed trace (not the position
cafe which intensity control is active . Set the CONTROL
of the B time-base unit).
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 .
23 . Set the HORIZONTAL MODE switch to B.