Hitachi V-212 Operation Manual page 28

SELECTION OF A TRIGGER SOURCE ON THE VERT
MODE
A trigger signal is obtained in the following steps.
1) Set the SOURCE switch @ to INT.
2) Set the INT TRIG switch @ to VERT MODE.
3) Select the MODE switch .
Table 1. Relation of trigger signal sources and switches
SOURCE ENT
LINE EXT
INT TRIG CHI CH2
VERT
MODE
V
CHI CHI CH2
CHI
CH2 CHI CH2 CH2
Line
External
M
ALT CHI CH2
CH1,CH2
0
(ALT)
D CHOP CHI CH2 ADD
E
ADD CHI CH2 ADD
24
When the SOURCE switch to INT, INT TRIG switch to VERT
MODE, and MODE switch to ALT, the input signals applied to
CHI and CH2 become trigger source alternatively at each
sweep. Consequently, even for an observation of two wave
forms of different frequencies, the waveform of the each
channel is stably tiggered.
In this case, the signal should be applied to both CHI and CH2,
and the two signals have the same level portion in excess of the
rated amplitude each other. There should be a common por
tion of levels available that is above the rated amplitude of
CHI andCH2.
When a sinewave is applied to CHI, and a square wave is
applied to CH2, "A"s in Fig. 1 are the levels possible for
synchronization.
a) Input coupling: DC b) Input coupling: AC
CHI
1)
>
o
CH2
otfi-n n n
Fig. 1