UTD2000M
User
Manual
Fig.
2
‐
23
Trigger
Hold
off
for
Synchronization
of
Complicated
Waveforms
Operational
Instructions
1.
Firstly,
we
use
the
method
for
the
synchronization
of
normal
signal,
which
is
to
select
“edge”
and
“trigger
source”
from
“trigger
menu”,
and
adjust
trigger
level,
thus
trying
the
best
to
stabilize
the
waveform
display.
2.
Press
horizontal
MENU
key
to
display
horizontal
menu.
3.
Change
the
hold
off
time
by
turning
“MULTIPURPOSE”
knob
located
on
the
upper
part
of
the
unit
panel
till
the
waveform
display
has
been
stabilized.
Operation
Skills:
Normally,
the
hold
off
time
is
slightly
less
than
the
time
of
“major
cycle”,
i.e.
when
observing
the
waveform
for
RS232
communication
signal,
if
the
hold
off
time
is
set
to
be
slightly
more
than
the
edge
starting
time
of
each
frame
of
data,
it
will
be
easier
to
observe.
Definitions
1.
Trigger
Source:
it
is
used
to
generate
trigger
signal.
A
variety
of
signal
source
can
be
used
as
trigger
source:
CH1,
CH2,
EXT,
EXT/5,
AC
LINE,
etc.
■
Input
channel:
The
most
commonly
used
trigger
source
is
either
CH1
or
CH2.
When
a
channel
is
selected
as
the
trigger
source
channel,
we
ignore
whether
or
not
its
input
waveform
has
been
displayed.
■
External
trigger:
trigger
signal
can
be
input
directly
through
input
end
of
external
trigger,
i.e.
we
can
use
an
external
clock
or
signal
from
circuit
under
test
as
the
trigger
source.
EXT
trigger
receives
external
trigger
signal
via
input
end
of
“EXT
TRIG”,
which
is
settable
for
signal
with
trigger
level
between
‐
0.8V
and
+0.8V.
When
the
source
is
“EXT/5”,
EXT
trigger
signal
has
been
divided
by
5
to
expand
the
scope
of
trigger
level
to
“
‐
4V~+4V”,
thus
to
enable
the
input
of
relatively
larger
signal
during
external
triggering.
■
AC
LINE:
mains
supply,
such
trigger
mode
can
be
used
to
observe
signal
related
to
mains
supply,
i.e.
the
relation
between
lighting
equipment
and
power
provision
equipment,
hence
to
acquire
stable
synchronization.
2.
Trigger
mode:
it
determines
the
act
of
an
oscilloscope
when
a
trigger
occurs.
This
oscilloscope
provides
three
kinds
of
trigger
modes:
auto,
normal
and
single.
■
Auto
trigger:
When
there
is
no
input
of
trigger
signal,
the
system
runs
and
collects
data
automatically
while
displaying
them;
when
there
is
any
trigger
signal,
it
automatically
switches
into
trigger
scanning,
thus
to
40
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