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I N T E R N A L T R I G G E R I N G
By setting S O U R C E selector @
the input signal in the triggering circuit is connected to the
internal trigger source.
A n y input signal can be easily triggered, because the input
signal fed to I N P U T ® or ( M ) is branched in the vertical
amplifier
to the trigger circuit so that it acts to create
trigger signal synchronized with the input signal, thus driv-
ing the sweep circuit.
With the S O U R C E selector set to C H 1 or C H 2 , a trigger
is developped by the C H 1 or C H 2 signal regardless of the
M O D E setting. With the S O U R C E selector set to L I N E ,
triggering is delivered from the commercial line frequency.
E X T E R N A L T R I G G E R I N G
With the S O U R C E selector set to E X T , a trigger signal
applied to the E X T T R I G jack (2^) serves as the external
trigger.
External triggering should be used when a signal
different f r o m the input signal for the vertical axis is used
for triggering.
In this case, the trigger signal must have a
certain time relation with the vertical input signal.
Fig. 7 shows input and output signals observed when a gate
signal is fed to E X T T R I G jack (2^) as a trigger signal (the
sweep circuit is driven with the gate signal) and, at the
same time, the burst signal produced by the gate signal
is fed to the sample circuit.
As shown in the figure, external triggering produces the
proper trigger regardless of the input signal to I N P U T jacks
(1f)and (14). T h u s there is no need of triggering adjustment
even if the input signal varies.
(2) Setting of coupling switch
A C
The trigger signal is capacitively coupled, so its D C
component is cut, giving a stable trigger which is not
affected by the D C component. With this advantage,
this position of the coupling switch is conveniently
selected for ordinary
trigger signal is lower than 10 H z , the trigger signal
to C H 1 , C H 2 , or L I N E ,
T r i g g e r s i g n a l
( G a t e s i g n a l )
C H 1 ( I n p u t s i g n a l o f
a m p l i f i e r , e t c . )
C H 2 ( O u t p u t s i g n a l o f
a m p l i f i e r , e t c )
applications.
However, if the
level becomes attenuated, resulting in difficulty
triggering.
H
F
R E J
The trigger signal is supplied through a low-pass filter
to eliminate the high-frequency
than 1.5 k H z ) , giving a stable triggering with low-
frequency component.
superimposed over the trigger signal as shown in Fig.8,
the high-frequency
noise is cut to provide a stable
trigger.
W a v e f o r m w i t h h i g h - f r e q u e n c y n o i s e s u p e r i m p o s e d
T r i g g e r s i g n a l p r o c e s s e d i n H F p ^ j m o d e
Fig. 8
D C
The trigger signal and the trigger circuit are directly
coupled to allow triggering from D C components. This
mode is useful I for the triggering with a low-frequency
waveform below 10 Hz or with a slowly
sharp edge signal such as lamp waveform.
(3) After the S O U R C E has been set, the trigger point can
be set by rotating L E V E L / S L O P E control @ .
T R I G G E R L E V E L
The trigger point of waveform is set with the L E V E L and
S L O P E controls. Fig. 9 shows the relation between L E V E L
and S L O P E with respect to trigger point. Set the level of
the trigger point as required.
" - " range o f S L O P E
" + " r a n g e o f S L O P E
Fig. 9
component
(higher
When high-frequency noise is
repetitive,
+ D i r e c t i o n
L E V E L
-
D i r e c t i o n
in
17
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