HP 1740A - Advanced Sweep Display Modes

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Model 1740A
b.
Adjust
POSN
@
to
align
base
of
square
wave
on
the
center
graticule
line,
and
adjust
TRIGGER
LEVEL
@
for
a
stable
display.
A
square
wave
with
an
amplitude
of
two
divisions
and
approximately
five
to
nine
positive-going
pulses
will
be
displayed.
3-16.
MAGNIFIED
SWEEP
DISPLAY.
a.
Perform
paragraph
3-15
to
obtain
Normal
Sweep
Display.
b.
Adjust
horizontal
POSITION
@
to
place
waveform
portion
to
be
magnified
on
CRT
center
graticule
(see
figure
3-3).
1740A-004
Figure 3-3. Normal Display
c.
Press
MAG
X10
@and
adjust
horizontal
FINE
©
for
precise
placement
of
magnified
display
(see
figure
3-4).
3-17. DELAYED SWEEP DISPLAY.
a.
Perform
paragraph
3-15
to
obtain
Normal
Sweep
Display.
b.
Adjust
delayed
TIME/DIV
@
for
50
HSEC/
div,
and
observe
intensified
portion
of
square
wave.
Set
BEAM
INTENSITY
@
control
to
a
comfortable
viewing level.
c.
Set
SWEEP
AFTER
DELAY
to
AUTO
and
turn
DELAY
@
clockwise
until
intensified
portion
of
1740A-005
Figure 3-4. Magnified Display
Operation
trace
is
over
trace
area
to
be
investigated.
This
is
demonstrated
in
figure
3-5.
1740A-006
——
INTENSIFIED
Figure
3-5.
Normal
Display
with
Intensified
Area
d.
Press
DLY’D
©
and
note
that
intensified
portion
of
trace
is
now
displayed
across
entire
CRT
(see
figure
3-6).
e.
DELAY
@
control
may
be
adjusted
to
view
other
pulses
in
the
pulse
train.
1740A-007
Figure
3-6.
Delayed
Sweep
Display
3-18.
MIXED
SWEEP
DISPLAY.
a.
Perform
paragraph
3-15
to
obtain
Normal
Sweep
Display.
b.
Adjust
delayed
TIME/DIV
@
for
50
nSEC
and
note
intensified
portion
of
square
wave.
Set
BEAM
INTENSITY
@
to
comfortable
viewing
level.
c.
Turn
DELAY
@
clockwise
until
part
of
wave
form
in
second
half
of
CRT
is
intensified
(see
figure
3-7).
d.
Press
MIXED
@
and
observe
that
first
portion
of
the
display
is
at
main
TIME/DIV
34]
sweep
rate
and
second
portion
is
at
delayed
TIME/DIV
5]
sweep
rate
(see
figure
3-8).
The
transition
point
from
main
sweep
to
delayed
sweep
can
be
varied
by
adjusting
DELAY
control@.
3-3