Source - Tektronix 2205 Operator's Manual

Operation
Table 2-1 (cont'd)
No. Title Function
Recommended Use
26
RESET Arms trigger cir¬
cuit for SQL SWP.
27
SOURCE CH 1. CH 2. LiNE.
and EXT trigger
signals are selec¬
ted directly, in
VERT MODE, trig¬
ger source is de¬
termined by the
VERTICAL MODE
selectors as
follows:
CH 1: trigger
comes from Chan¬
nel 1 signal.
CH 2: trigger
comes from Chan¬
nel 2 signal.
BOTH-ADD and
BOTH-CHOP:
trigger is algebraic
sum of Channel 1
and Channel 2 sig¬
nals,
80TH-ALT: trig¬
ger comes from
Channel 1 and
Channel 2 on
alternate sweeps.
Select source of
signal that is coupled
to the trigger circuit.
28
EXT INPUT
Connection for
applying external
signal for use as
a trigger.
Trigger from a source
other than vertical
signal. Also used for
singie-shot application.
Connection for
applying external
signal for intensity
modulation. To
intensity modulate
the display, set the
right TRIGGER
SOURCE control
to EXT=Z.
Provide intensity
modulation from
independent source.
2205 Operator's
2-5