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"CS-1022, 1021, 1012
CS-1020, 1010
16
one sweep displayes the channel 1 signal and the next
sweep displays the channel 2 signal in an alternating se-
quence.
In the CHOP mode, the sweep is chopped at an approx-
imate
250 kHz rate and switched
between
CH1
and
CH2. Note that in the CHOP mode of operation with the
SOURCE
switch
set to V. MODE,
the trigger source
becomes the chopping signal itself, making waveform
observation impossible. Use ALT mode instead in such
cases, or select a trigger SOURCE of CH1 or CH2.
If no trace is obtainable, refer to the following TRIGGER-
ING procedures.
. After setting the SOURCE
switch,
adjust the SLOPE
control.
The display on the screen will probably be unsynchroniz-
ed. Refer to TRIGGERING
procedure below for adjusting
synchronization
and
sweep
speed
to obtain
a stable
display showing the desired number of waveform.
TRIGGERING
The
input signal
must
be properly
triggered
for stable
waveform
observation.
TRIGGERING
is possible the input
signal INTernally to create a trigger or with an EXTernally
provided
signal
of timing
relationship
to the observed
signal, appliying such a signal to the EXT TRIG INPUT jack.
The SOURCE
switch selects the input signal that is to be
used to trigger the sweep,
with
INT
sync
possibilities
(V.MODE, CH1, CH2, LINE) and EXT sync possibility.
*
Internal Sync
When the
SOURCE
selection is in INT (V.MODE,
CH1,
CH2, LINE), the input signal is connected to the internal
trigger circuit. In this position, a part of the input signal fed
to the INPUT
©
or @
jack is applied from the vertical
amplifier to the trigger circuit to cause the trigger signal
triggered with the input signal to drive the sweep.
When the V.MODE
position is selected, the trigger source
is dependent upon the vertical MODE selection.
When the vertical MODE selection is in ALT, the ALT posi-
tion is very convenient for measuring the time duration of
the waveform.
However, for phase or timing comparisons
between
the channel
1 and channel
2 waveforms,
both
traces must be triggered by the same sync signal.
When the SOURCE selection is in CH1, the input signal at
the channel
1 INPUT ©) jack becomes trigger regardless of
the position of vertical MODE. When the SOURCE selection
is in CH2, the input signal at the channel 2 INPUT @ jack
becomes
trigger
regardless
of the
position
of vertical
MODE.
When the SOURCE
selection in LINE, the ac line
voltage powering the oscilloscope is used as sync trigger-
ing.
*
Enternal Sync
When the SOURCE selection is in EXT, the input signal at
the EXT TRIG INPUT
@) jack becomes the trigger. This
signal must have a time or frequency relationship to the
provided
signal
of timing
relationship
to the
observed
signal, applying such a signal to the EXT TRIG INPUT jack.
The SOURCE
switch selects the input signal that is to be
used to trigger the sweep,
with INT sync possibility and
EXT sync possibility.
*
Internal Sync
When the SOURCE selection is in INT, the input signal is
connected to the internal trigger circuit. In this position, a
part of the input signal fed to the INPUT © jack is applied
from the vertical amplifier to the trigger circuit to cause the
trigger signal triggered with the input signal to drive the
sweep.
When the SOURCE selection is in LINE, the ac line voltage
powering the oscilloscope is used as sync triggering.
*
External Sync
When the SOURCE selection is in EXT, the input signal at
the EXT TRIG INPUT
@) jack becomes the trigger. This
signal must have a time or frequency relationship to the
signal being observed to synchronize the display. External
sync is prefered for waveform observation in many applica-
tions. For example, Fig. 8 shows that the sweep circuit is
driven by the gate signal when the gate signal in the burst
signal is applied to the EXT TRIG INPUT jack. Fig. 8 also
shows
the input/output
signals,
where
the burst signal
generated from the gate signal is applied to the instrument
under
test.
Thus,
accurate
triggering
can
be achieved
without regard to the input signal fed to the INPUT © jack
so that no further triggering is required even when the input
signal is varied.
|
|
Trigger signal
:
(Gate signal)
i]
|
|
:
Input signal to
amplifier, etc.
Output signal from
amplifier, etc.
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