Hitachi V-209 Operation Manual page 29

0.35
f c
t r
x
=
f c : Frequency band
Where,
tr: Rise time
The rise time and fall time are determined by the time
elapsed between the I 0'1 to 9Qc,r \'a lues of pulse width.
(6)
Synchronization of complexed waveform
In the case shown in the Fig. (a) below where two wave­
forms have difference in amplitude alternate. the wave­
form is doubled if the trigger level is not set properly. In
the case where the trigger level is selected as Y line two
waveforms. one starting with A and advancing to B. C. D, E.
F .... and the other starting �ith E and advancing to F,
H, I . . .. will appear alternately on the screen. They
G.
will be doubled as shown in Fig. (b), for which no synchro­
nization can be taken.
In such a case, rotate LEVEL clockwise until the trigger
level comes to Y' line. Then the waveform on the screen be­
comes the one shown in F1g. (c) above wh1ch starts with
B and advances to C, E. r, .
niLation.
(Hz)
(s)
and which allows synchro­
. .
�
(a) Signal waveform
(b) When the uiggc
r
...: n ing
level Y
•�
Synchronization of complexed waveform
How to use TV exclusive synchronization
(7)
CD On the image waveform of TV
In the work concerned w1th TV. comple:-.ed signals con­
taining video signal. blanking pedestal signal. and syn­
chronizing s1gnal are often measured. llowever, since
the waveform is complexed, a special circuit IS needed
10 effect a stable syncrhonization with vertical waveform.
Synchronizing
signal pulse
(SYNC pulse)
Y' Trigger level
y �Lting line
(c) When the uigger
selling y·
level i'
IV ---- --�
(vertical)
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