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Tektronix 585 - Page 18

Tektronix 585
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Operating
Instructions
—
Type
585
Fig.
2-11.
Comparison
of
single
sweep
and
repetitive
sweep
presentations
of
a
damped
sine
wave.
Note
the
jumbled
display
produced
by
the
repetitive
sweep
presentation.
Delayed
Sweep
Using
the
Type
585
Oscilloscope,
the
start
of
the
hori
zontal
sweep
can
be
delayed
for
a
period
of
from
1
micro
second
to
10
seconds
after
application
of
the
triggering
waveform.
This
is
done
through
simultaneous
use
of
Time
Base
A
and
Time
Base
B.
In
this
application
Time
Base
B
is
used
to
provide
the
accurate
time
delay
while
Time
Base
A
presents
a
normal
horizontal
sweep
at
the
end
of
the
delay
period.
The
duration
of
the
sweep
delay
is
controlled
by
the
TIME
BASE
B
TIME/CM
or
DELAY
TIME
switch
and
the
DELAY-TIME
MULTIPLIER
control.
The
delayed
sweep
feature
of
the
Type
585
Oscilloscope
can
be
used
in
a
number
of
special
applications
to
increase
the
versatility
of
the
instrument.
Such
applications
include
high
magnification
of
a
selected
portion
of
an
undelayed
sweep,
accurate
time
measurements,
and
accurate
measure
ments
of
waveform
jitter.
Also,
it
is
possible
to
pick
off
and
display
any
desired
line
of
a
television
scan
or
to
check
pulse-time
modulation.
The
delayed
sweep
feature
is
readily
adaptable
to
a
great
number
of
other
applica
tions.
Fig.
2-12.
Calculating
delay
time.
The
delayed
sweep
feature
is
selected
when
the
HORI
ZONTAL
DISPLAY
switch
is
in
the
‘
A'
DEL'D
by
B'
posi
tion.
The
amount
of
delay
occur
r
ing
after
the
application
of
the
triggering
waveform
until
the
sweep
is
permitted
to
run,
is
indicated
directly
by
the
settings
of
the
TIME/CM
or
DELAY
TIME
switch
and
the
DELAY-TIME
MULTIPLIER
control.
The
settings
of
the
two
controls
are
multiplied
together
to
obtain
the
actual
delay
time.
For
example,
if
the
TIME/CM
or
DELAY
TIME
switch
is
set
at
1
MILLISEC
and
the
vernier
dial
of
the
DELAY-TIME
MULTIPLIER
control
indicates
6.75,
the
delay
time
is
6.75
milliseconds.
When
this
time
delay
has
elapsed,
one
of
two
events
will
occur
depending
upon
the
setting
of
the
Time
Base
A
STABILITY
control.
If
the
STABILITY
control
is
fully
clockwise,
the
hori
zontal
sweep
will
occur
immediately
at
the
end
of
the
delay
period.
This
is
the
mode
of
operation
most
com
monly
used
because
it
allows
obtaining
calibrated,
continu
ously
variable
delay
times.
If
the
Time
Base
is
adjusted
for
normal
triggered
operation,
the
horizontal
sweep
does
not
start
at
the
end
of
the
delay
period
but
waits
until
a
triggering
signal
is
received
to
the
“
A"
Trigger
Circuit.
The
triggering
pulse
may
be
either
the
input
waveform
to
the
oscilloscope,
or
an
externally
de
rived
triggering
signal.
The
triggering
slope,
source,
and
level
can
be
selected
in
the
same
manner
as
for
conventional
triggered
operation.
In
this
mode
of
operation,
the
delay
in
presentation
of
the
horizontal
sweep
is
not
continuously
vari
able
but
is
dependent
on
both
the
setting
of
the
delay
time
controls
and
the
occurrence
of
the
triggering
signal.
The
delay
plus
trigger'
mode
is
used
primarily
to
elimin
ate
jitter
from
the
displayed
waveform.
Since
the
sweep
is
usually
triggered
by
the
input
waveform,
inherent
jitter
in
the
waveform
is
eliminated
from
start
of
the
display.
When
using
the
‘
delay
plus
trigger'
mode,
the
READY
light
on
the
oscilloscope
front
panel
goes
on
when
the
delay
time
has
elapsed
to
indicate
that
the
sweep
is
ready
to
be
triggered.
When
the
sweep
is
triggered,
the
READY
2-10

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