Tektronix 5441 Instruction Manual page 22

Operating Information-5441lR5441
play will occur (Alternate or Chopped). When no plug-in is in ing sequence is discussed earlier. In general, the Chop
the active mode, the signal from the left compartment will be mode provides the best display at sweep rates slower than
displayed. A time-base unit operated in one of the vertical approximately 1 msldiv or whenever dual-trace single-shot
compartments has a permanent internal connection to apply phenomena are to be displayed. At faster sweep rates, the
a logic level to the switching circuit; thus, a vertical trace chopped switching becomes apparent and may interfere
produced by this unit will always be displayed.
with the display.
Horizontal Plug-in Compartment. Alternate or Chopped
display switching is selected on a time-base unit operated in
the horizontal compartment. When the Display switch is out
(Alt), a negative impulse is supplied at the end of the sweep
to allow alternate switching between plug-ins and plug-in
channels. When the Display switch is pushed in (Chop), a
chopped display will appear if a multi-trace display is re-
quired by the plug-ins in the vertical compartments. A verti-
cal plug-in unit operated in the horizontal compartment has
a permanent internal connection to provide a chopped dis-
play if it is required.
Dual-Sweep Displays. When a dual-sweep time-base
unit is operated in the horizontal compartment, the alternate
and chopped time-shared switching for either the A or B
sweep is identical to that for a single time-base unit. Howev-
er, if both the A and B sweeps are operating, the 5441 oper-
ates in the independent pairs mode. Under this condition,
the left vertical unit is always displayed at the sweep rate of
the A time base and the right vertical unit is displayed at the
sweep rate of the B time base (non-delayed sweep only).
This results in two displays that have completely indepen-
dent vertical deflection and chopped or alternate sweep
switching.
Switching Sequence. Four display time slots are provid-
ed on a time-sharing basis. When two vertical plug-ins are X-Y Operation
active, each receives two time slots, so the switching se-
quence is: left, left, center, center, etc. The two time slots
allotted to each plug-in are divided between amplifier chan-
nels in a dual-trace unit; if two dual-trace plug-ins are active,
then the switching sequence is: left Channel 1, left Channel
2, center Channel 1, center Channel 2, etc. If only one verti-
cal plug-in is active, it receives all four time slots. The
switching sequence is the same for both the Alternate and
chopped display modes.
Vertical Display Mode
Display On. To display a signal, the Display button of the
applicable vertical plug-in unit must be pushed in to activate
the unit. If two plug-ins are installed in the vertical compart-
ments and only the signal from one of the units is wanted,
set the Display switch of the unwanted unit to Off (button
out). If neither plug-in is activated, the signal from the left
unit is displayed. Both plug-ins can be activated for multi-
trace displays.
Alternate Mode. The alternate position of the time-base
unit Display switch produces a display that alternates be-
tween activated plug-ins and amplifier channels with each
sweep of the crt. The switching sequence is described under
Display Switching Logic in this section. Although the Alter-
nate mode can be used at all sweep rates, the Chop mode
provides a more satisfactory display at sweep rates from
approximately 1 msldiv to 5 sldiv. At these slower sweep
rates, alternate-mode switching becomes difficult to view.
Chopped Mode. The Chop position of the time-base unit
Display switch produces a display that is electronically
switched between channels at a 100 kHz rate. The switch-
In some applications, it is desirable to display one signal
versus another (X-Y) rather than against an internal sweep.
The flexibility of the plug-in units available for use with the
5441 provides a means for applying a signal to the horizon-
tal deflection system for this type of display. Some of the
5B-series time-base units can be operated as amplifiers, in
addition to their normal use as time-base generators.
Raster Display
A raster-type display can be used to effectively increase
the apparent sweep length. For this type of display, the
trace is deflected both vertically and horizontally, by saw-
tooth signals, and is accomplished by installing a 5B-series
time-base unit in the left vertical compartment, as well as
one in the horizontal compartment. Normally, the unit in the
vertical compartment should be set to a slower sweep rate
than the one in the horizontal compartment; the number of
horizontal traces in the raster depends upon the ratio be-
tween the two sweep rates. Information can be displayed on
the raster using the Ext lntensity Input to provide intensity
modulation of the display. This type of raster display can be
used to provide a television-type display.
lntensity Modulation
lntensity (Z-Axis) modulation can be used to relate a third
item of electrical phenomena to the vertical (Y-Axis) and the
horizontal (X-Axis) coordinates without affecting the wave-
shape of the displayed signals. The Z-Axis modulating sig-
nal, applied to the EXT INTENSITY INPUT, changes the
intensity of the displayed waveform to provide this type of
display. The voltage amplitude required for visible trace
modulation depends on the setting of the INTENSITY con-
trol. Approximately +5
V will turn on the display to a normal
2-8
REV MAY 1982