20
Note:
If the two applied signals are in phase, they can
both be added algebraically, e.g. 4.2 div + 1.2
div = 5.4 div. If the two applied signals are in
phase opposition (180º), the two signals are
subtracted from each other, e.g. 4.2 div - 1.2 div
= 3 div.
For algebraic subtraction, follow the same pro-
cedure as that described for ADD and pull out
the POSITION knob (17). In-phase signals are
then displayed as a difference and signals in
phase opposition are displayed as a sum.
2.2.8 X-Y mode
In this mode both channels are switched as the
X and Y input, CH 1 for the X-axis and CH 2 for
the Y-axis with both axes having a time base.
The MODE switch (18), the entire trigger section
and all the knobs and sockets associated with it
are inoperative in X-Y mode.
The basic settings for X-Y mode are as follows:
1. Turn the time-base switch (20) to the right as
far as the stop.
Note:
Reduce the intensity (2), otherwise the spot in
the centre of the screen (if no signals are
present) will destroy the screen's phosphor
coating.
2. Then connect the horizontal signal to channel
2 and the vertical signal to channel 1. You can
readjust the brightness as soon as a display
becomes visible.
3. Use the VOLTS/DIV knob for CH2 to adjust the
height of the display and use the VOLTS/DIV
knob for CH1 to adjust the display width. It
may also be useful to use the expansion
switches (14) and (15).
4. The position of the trace can be moved
upwards and downwards by control (17) and
to the left and right by control (22). The
position knob (16) is inoperative in X-Y mode.
5. The signal for the Y-axis can be inverted by
pulling out knob (17).
2.2.9 Delay mode = delayed sweep
Oscilloscopes OS-3020 and OS-3060 have two
time bases, one for the "real-time display" of a
signal (time base A) and one for delayed sweep
(time base B). This makes it possible to
delay/stretch/expand a selected portion of a
signal or a pulse, e.g. a TTL signal, at the same
time as displaying the original signal. Delayed
sweep can be used both in single-trace and in
dual-trace mode.
1. Set the Vertical mode switch (18) to the de-
sired position.
2. Make sure that the B TRIG'D pushbutton in
the HORIZONTAL DISPLAY panel (20) is
pressed.
3. Press the A INT button in the HORIZONTAL
DISPLAY panel (21). A portion of the signal is
displayed "thicker".
Note:
If the portion of the signal displayed is very
small (dot), the settings of the knobs for time
base A and time base B are too different.
4. Adjust the knob for time base B until the sel-
ected portion of the signal is sufficiently
large/wide to produce a "clean image". See
also Figure 9b.
5. Adjust the DELAY'D knob (23) in order to
place/position the "trace unblanking" over
the selected portion of the signal.
6. Then press button B in the HORIZONTAL DIS-
PLAY panel (20). The selected portion of the
signal is then displayed over the entire width
of the screen. See also Figure 9c.
7. The displayed signal form can be expanded
more by a factor of 10 by pulling out the
VARIABLE knob (24).
Triggering of time base B
If the ratio of the switch position of the knob for
time base A to that for time base B exceeds
100:1, the B trace may be affected by jitter, i.e. it
is unstable and triggering is not "clean".
To prevent this phenomenon, press the B TRIG'D
button in the HORIZONTAL DISPLAY panel (20)
and use the TRIGGER LEVEL knob (29) to re-
adjust.
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