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A TRIGGERING S O U R C E (A SOURCE) Selector Switch
and LEDs
Selects a trigger source of A s w e e p . Every press of the
• s w i t c h advances a selected LED from left to right in
sequence. Next to LINE, V E R T is selected. (A selected
LED advances at the interval of approx. 0 . 5 second by
keeping pressing the s w i t c h . )
NOTE: If V E R T is selected, any LED of CH1 to C H 4 also
lights up (depending on setting of the V E R T I C A L
MODE s w i t c h e s © ) .
V E R T : Trigger source of A s w e e p is selected with the
V E R T I C A L MODE s w i t c h e s © . It is selected in
the following order of priority, if more than one
of the V E R T I C A L MODE s w i t c h e s is selected.
CH1
C H 2
NOTE: If A D D of the V E R T I C A L MODE switches
© is selected in the single trace mode,
C H 1 is displayed as A S O U R C E .
CH 1:
A s w e e p is triggered by channel-1 vertical axis
input signal.
C H 2 :
A s w e e p is triggered by channel-2 vertical axis
input signal.
C H 3 :
A s w e e p is triggered by channel-3 vertical axis
input signal.
C H 4 :
A s w e e p is triggered by channel-4 vertical axis
input signal.
LINE:
Triggered by commercial frequency.
A COUPLING (§) switch is fixed to A C . If another
trigger source is selected, previous condition is
restored.
N O T E : If A COUPLING (§) s w i t c h is set to T V
F R A M E or T V LINE, LINE of the A
S O U R C E s w i t c h cannot be selected.
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HOLD OFF Control
Adjusts the interval between s w e e p operations. Clock-
w i s e rotation from the NORM position, i.e., full coun-
terclockwise position, increases the hold-off time. Full
clockwise rotation provides variation more than five
times.
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T R A C E SEP(aration) Control
Counterclockwise rotation moves down the B s w e e p
trace line by approx. 4 div. with respect to the A sweep
trace line. This control functions w h e n A L T or B of the
H O R I Z O N T A L M O D E s w i t c h e s ® is selected.
(38)
A TRIGGERING COUPLING (A COUPLING) Selector
Switch and LEDs
S w i t c h Selects coupling types of the A s w e e p trigger
signal. Every press of the • s w i t c h advances a select-
ed LED from left to right in sequence. Next to T V LINE,
A C is selected. (A selected LED advances at the inter-
val of approx. 0 . 5 second by keeping pressing the
switch.)
A C :
The A s w e e p trigger signal is applied to the
trigger circuit by A C coupling. DC compo-
nent is eliminated.
N O I S E R E J :
T h e A s w e e p trigger signal with reduced
trigger sensitivity is applied to the trigger
circuit.
Therefore, trigger signal with noises mixed
can cause triggering stably.
H F R E J :
The A sweep trigger signal is applied to the
trigger circuit via a low-pass filter. Since
high-frequency components are attenuat-
C H 3 -
-
A D D (CH1)
C H 4
ed, low-frequency signals can be triggered
stably.
DC:
The A sweep trigger signal is applied to the
trigger circuit by DC coupling,
triggering including DC component.
T V F R A M E : Triggered by the vertical synchronizing sig-
nal of the video signals.
T V LINE:
Triggered by the horizontal synchronizing
signal of the video signals.
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TV COUNT Switch
Goes into operation w h e n the A s w e e p T R I G G E R I N G
COUPLING is selected. When the switch is pressed, the
LED lights up and " F L D 1 , 1 H / 5 2 5 " is displayed in the
upper right portion of the monitor (this display can be
preset to give different values as well). T h e line num-
ber is set by rotating Z i R E F / D E L A Y POSITION knob. If
video signals are input, A S W E E P begins from the preset
line. If the s w i t c h is pressed again, the LED goes off
and the T V C O U N T mode is canceled.
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A TRIGGERING LEVEL (A LEVEL) Control
Trigger level control of A s w e e p . S e t s a s w e e p start
point on a slope of the trigger signal w a v e f o r m .
Trigger
level adjustment
COUPLING © s w i t c h is set to T V F R A M E or T V LINE,
or T R I G G E R I N G MODE © s w i t c h e s is set to F I X .
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A TRIGGERING SLOPE (A SLOPE) Switch
Selects triggering polarity of the A s w e e p . Pressing the
s w i t c h turns on the LED and selects triggering at the
trailing edge of input w a v e f o r m . Another press of the
s w i t c h turns off the L E D and selects triggering at the
leading edge of input w a v e f o r m .
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TRIG COUNT Switch
Functions in the delayed s w e e p mode (A INT B, A L T ,
or B of the HORIZONTAL MODE s w i t c h © is selected).
Pressing the s w i t c h turns on the L E D and displays
COUNT as well as a count value posterior to the COUNT
in the upper right of the C R T . This count value is set
with the D E L A Y POSITION control © within the range
from 1 to 2 0 0 0 . Clockwise rotation of the control in-
creases the value. Number of pulses of a channel select-
ed with the B S O U R C E s w i t c h © is counted from the
point w h e n the A s w e e p starts. When the number of
pulses reaches the preset value, the B s w e e p starts.
Another press of the s w i t c h turns off the LED and re-
stores the triggered delay mode.
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B TRIGGERING COUPLING (B COUPLING) Selector
Switch and LEDs
Selects coupling types of the B s w e e p trigger signal.
Every press of the • s w i t c h advances a selected LED
from left to right in sequence. Next to D C , A C is select-
ed. Fixed, however, to T V LINE if T V F R A M E or T V LINE
of the A COUPLING s w i t c h © is selected. (A selected
LED advances at the interval of approx. 0 . 5 second by
keeping pressing the switch.)
Selection of the B COUPLING switch possible only when
the A INT B, A L T , or B of the H O R I Z O N T A L MODE
s w i t c h e s © is selected. In such a c a s e , the previous
condition is displayed on the L E D .
If the A or X - Y of the H O R I Z O N T A L MODE s w i t c h e s
is selected, LED goes out and selection is disabled.
enabling
is unnecessary if the
A
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