Hitachi V-355 Operation Manual page 25

x
f c t r = 0.3 5
f c : Frequency band (Hz)
Where ,
tr : Rise time
The rise time and fall time are determined by the time
elapsed between the 1 0% to 90% values of pulse width.
This o scill o scope is provided with graduations for 0%, 10%,
90%, and 1 00% on the screen, which facilitate measureme nt .
(6) Synchronization of complexed waveform
In the case shown in Fig. (a) where two waveforms greatly
different in amplitude alternate, the waveform 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 start­
ing with A and advancing to B, C, D, E, F, . . . and the
other starting with E and advancing to F, G, H, I . . . , will
appear alternately on the screen. They will be doubled
as shown in Fig. (b), for which no synchronization cab be
taken.
In such a case , rotate LEVEL clockwise until the trigger
level come s to Y' line . Then the waveform on the screen be­
come s the one is shown in Fig. (c) which start with B and
advances to C, E, F, . . . and which allows synchroniza­
tion.
2 2
(s)
(a) Signal waveform
(b) When the trigger
setting level is Y
Synchronization of complexed waveform
(7) Synchronization of observing two waveforms
CD
When two signals of CH I and CH2 have same frequencies
or the frequencies of an integral number or the frequen­
cie s in a relation of a specific time difference, the INT
TRIG switch selects either CH I or CH2 as a reference
signal. CH I positio n selects CH I signal as a re ference,
and CH2 position selects CH2 signal .
@
For an observation of signals of different frequencies, set
the INT TRIG switch to the VERT MODE. The sync
signal switches at each alternation of channels, and the
waveform of the each channel is stably triggered.
Y ' Trigger level
y
setting line
L
(c) When the trigger
setting level is Y'