Kenwood CS-1022 Instruction Manual page 16

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•:'CSr1022, 1021, 1012
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 2 5 0 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.
4 . After setting the SOURCE s w i t c h , 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 w i t h an EXTernally
provided signal of timing relationship t o 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 t o trigger the sweep, w i t h INT sync possibilities
(V.MODE, C H 1 , CH2, LINE) and EXT sync possibility.
*
Internal Sync
When the
SOURCE selection is in INT (V.MODE, C H 1 ,
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 (D or (D jack is applied from the vertical
amplifier t o the trigger circuit t o cause the trigger signal
triggered w i t h 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 C H 1 , the input signal at
the channel 1 INPUT (5) 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 (D jack
becomes trigger regardless of the position of
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
@
signal must have a time or frequency relationship t o the
16
vertical
jack becomes the trigger. This
CS-1020, 1 0 1 0
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 t o the INPUT (D jack
so that no further triggering is required even when the input
signal is varied.
Fig. 8
Trigger signal
(Gate signal)
Input signal t o
amplifier, etc.
Output signal from
amplifier, etc.

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