5-3
ADD
Operation
An algebraic sum of the CHI and CH2 signals can be displayed on the screen by setting the VERT MODE switch to ADD.
The displayed signal will be difference between CHI and
CH2
if press CH2 INV push button. Adjust
A
POSITION knob
of CH1 or CH2 can make vertical position, to the advantage of the linearity of the vertical amplifiers, it's better to set
A
POSITION knob of both channels in middle position.
5-4.Triggering
Proper triggering is essential for an efficient operation of the instrument. Users must make themselves familiar with the
triggering functions and procedures thoroughly:
(1)Functions of
MODE
switch:
AUTO
NORM
TV-V
Select automatic sweep operation by setting to AUTO mode, the sweep generator will freely generate a sweep
without a trigger signal. However, it will automatically switch to triggering sweep operation if an acceptable
trigger source signal is preset. The AUTO mode is handy for observing the waveform when first set up the
instrument, as it provides sweep function for waveform observation until properly set to other mode. Once
starting to set the control mode, the operation often jumps back to the NORM trigger mode as it is much more
sensitive. Automatic sweep must be used for DC measurements and signals with low amplitude in order not to
trigger the sweep.
The NORM mode provides normal triggering sweep operation. The sweep will not act until the selected trigger
source signal crosses the threshold level set by TRIG LEVEL control knob. The triggering generate one sweep
which will come to inactivate until another triggering occurs. In the NORM mode, there will be no trace unless
an adequate trigger signal is present. In the ALT mode of dual trace operation with NORM sweep selected,
there will be no trace unless both
CHI and CH2 signals are adequate for triggering.
Set the MODE switch to TV-V mode, select vertical sync pulses for sweep triggering to view composite video
waveforms. Select vertical sync pulses as a triggering to view vertical fields and frames of video.
A
sweep time
of
2
msi'div
is
appropriate for
viewing
fields
of
video and
5
ms/div for complete frames
(two
interlaced fields)
of video.
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