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Tektronix 585 - Page 29

Tektronix 585
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Applications
—
Type
585
Fig.
3-10.
Computing
the
phase
angle.
The
distance
from
the
reference
point
established
in
Fig.
3-9
to
the
point
where
the
curve
crosses
the
centerline,
multiplied
by
8°
per
centimeter
is
the
phase
angle.
as
possible.
Carefully
center
the
waveform
vertically
about
the
horizontal
centerline.
Switch
the
magnifier
back
on
and
rotate
the
VERNIER
HORIZONTAL
POSITION
control
fully
clockwise.
Without
adjusting
either
the
triggering
or
the
black
HORIZONTAL
POSITION
control,
measure
the
dis
tance
from
the
extreme
left
graticule
marking
to
the
point
where
the
curve
crosses
the
horizontal
centerline
(see
Fig.
3-10).
This
distance
multiplied
by
the
number
of
degrees
per
centimeter
is
the
phase
angle.
(For
phase
angles
up
to
80°
the
measurement
should
be
made
with
the
magnifier
on
for
maximum
accuracy.
With
the
magnifier
on,
the
scale
calibration
is
8
degrees
per
centimeter.
For
phase
angles
greater
than
80°,
measurements
must
be
made
with
the
magnifier
off.
With
the
magnifier
off,
the
scale
calibration
is
40
degrees
per
centimeter.
When
phase
angles
are
meas
ured
with
the
magnifier
off,
step
3
must
be
repeated
with
the
magnifier
off.)
Method
2
:
1.
Place
the
HORIZONTAL
DISPLAY
switch
in
the
"B"
INTENSIFIED
BY
“
A"
position.
Turn
off
the
magnifier.
Ro
tate
the
Time
Base
A
STABILITY
control
fully
clockwise.
Connect
the
external
triggering
signal
to
the
time
Base
B
TRIGGER
INPUT
connector
and
adjust
the
Time
Base
B
triggering
controls
for
stable
operation.
2.
Connect
the
first
(leading)
waveform
to
the
oscilloscope
input.
Adjust
the
Time
Base
B
TIME/CM
control
so
that
approximately
2
or
3
(or
if
more
than
2
or
3,
as
few
as
possible)
cycles
are
displayed
on
the
screen.
Set
the
Time
Base
A
TIME/CM
controls
for
a
sweep
approximately
20
times
as
fast
as
Time
Base
B.
3.
Center
the
waveform
exactly
about
the
horizontal
center-
line.
Adjust
the
DELAY-TIME
MULTIPLIER
control
so
that
the
start
of
the
brightened
portion
of
the
trace
is
at
the
point
where
the
curve
crosses
the
horizontal
centerline
the
second
time
(see
Fig.
3-11).
Place
the
HORIZONTAL
DISPLAY
switch
in
the
"A"
DEL'D
BY
“
B"
position.
Adjust
the
DELAY
TIME
MULTIPLIER
control
so
that
the
sweep
starts
at
the
horizontal
centerline
of
the
graticule.
Record
the
setting
of
the
DELAY
TIME
MULTIPLIER
control.
4.
Place
the
HORIZONTAL
DISPLAY
switch
at
"B"
INTENSI
FIED
BY
"A".
Adjust
the
DELAY-TIME
MULTIPLIER
control
so
that
the
start
of
the
brightened
portion
of
the
trace
is
at
the
point
where
the
curve
crosses
the
horizontal
centerline
the
fourth
time.
Place
the
HORIZONTAL
DISPLAY
switch
at
“
A'"
DEL
’
D
BY
“
B"
and
adjust
the
DELAY-TIME
MULTI
PLIER
control
so
that
the
trace
starts
at
the
horizontal
center-
Leading
Waveform
Brightened
Area
Fig.
3-11.
Setting
the
start
of
the
brightened
area
at
the
hori
zontal
centerline
using
the
leading
waveform.
line
of
the
graticule.
Record
the
setting
of
the
DELAY
TIME
MULTIPLIER
control.
Subtract
the
setting
of
the
DELAY
TIME
MULTIPLIER
control
obtained
in
step
3
from
that
ob
tained
in
this
step.
The
number
obtained
is
the
dimension
B
shown
in
Fig.
3-8.
5.
Disconnect
the
first
waveform
and
connect
the
second
(lagging)
waveform
to
the
oscilloscope
input.
Place
the
HORIZONTAL
DISPLAY
switch
in
the
"B
”
INTENSIFIED
BY
"A
”
position.
Center
the
displayed
waveform
exactly
about
the
horizontal
centerline
of
the
graticule.
Adjust
the
DELAY
TIME
MULTIPLIER
control
clockwise
from
the
final
setting
of
step
4
until
the
start
of
the
brightened
portion
of
the
trace
is
at
the
point
where
the
curve
next
crosses
the
hori
zontal
centerline
of
the
graticule
(see
Fig.
3-11).
Place
the
HORIZONTAL
DISPLAY
switch
at
"A
”
DEL'D
BY
"B
”
.
Adjust
the
DELAY-TIME
MULTIPLIER
control
so
that
the
start
of
the
trace
is
at
the
horizontal
centerline
of
the
graticule.
Record
the
setting
of
the
DELAY-TIME
MULTIPLIER
control.
Subtract
the
setting
of
the
DELAY-TIME
MULTIPLIER
control
obtained
in
step
4
from
that
obtained
in
this
step.
The
figure
obtained
is
the
dimension
A
shown
in
Fig.
3-8.
6.
Using
the
value
of
A
from
step
5
and
the
value
of
B
from
step
4,
calculate
the
phase
angle
from
the
relationship,
phase
angle
—
(360°)
(A/B).
3-7

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