Tektronix 2205, Operator'S Manual

Page: 29 / 91

Operation
Table 2-1 (cont’d)
No. Title
Function
Recom m ended Use
26
RESET
Arms trigger cir­
cuit for SGL 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 ie algebraic
sum of Channel 1
and Channel 2 sig­
nals.
BOTH-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
single-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