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Tektronix 585 - Page 25

Tektronix 585
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Applications
—
Type
585
Attenuation
Factor
Of
Head
X
0.1
Volts
cm
Vertical
Deflection
From
Reference
Line
Instantaneous
~
Voltage
To
Ground
Fig.
3-3.
Measuring
the
instantaneous
voltage
to
ground
(or
other
reference
voltage).
Time
Measurements
The
calibrated
sweep
rates
of
the
Type
585
Oscilloscope
cause
any
horizontal
distance
on
the
c
rt
to
represent
a
def
inite
known
interval
of
time.
Using
this
feature
you
can
measure
accurately
the
time
between
two
displayed
events
directly
from
the
ert.
One
method
which
produces
sufficient
accuracy
for
most
appications
follows
(see
Fig
3-4):
1.
Using
the
graticule,
measure
the
horizontal
distance
be
tween
the
two
displayed
events
whose
time
interval
you
wish
to
find.
2.
Multiply
the
distance
measured
by
the
setting
of
the
ap
propriate
TIME/CM
control
to
obtain
the
apparent
time
interval.
(The
VARIABLE
TIME/CM
control
must
be
in
the
CALIBRATED
position).
3.
Divide
the
apparent
time
interval
by
5
if
the
magnifier
is
on,
to
obtain
the
actual
time
interval.
For
example,
assume
that
the
TIME/CM
switch
setting
is
1
MILLISEC,
the
magnifier
is
on,
and
that
you
measure
a
horizontal
distance
of
5
centimeters
between
events.
In
this
example
then,
5
centimeters
multiplied
by
1
millisecond
per
centimeter
gives
you
an
apparent
time
interval
of
5
milliseconds.
The
apparent
time
divided
by
5
then
gives
you
the
actual
time
interval
of
1
millisecond.
Increased
Accuracy
Time
Measurements
Another
method
for
measuring
time
intervals
involves
the
use
of
the
intensified
sweep
feature
of
the
Type
585
Oscillo
scope.
In
this
method
the
HORIZONTAL
DISPLAY
switch
is
placed
in
the
"B"
INTENSIFIED
BY
"A"
position
to
brighten
a
portion
of
the
trace.
The
brightened
portion
of
the
trace
is
then
used
as
a
continuously
variable
time
marker.
The
brightened
portion
of
the
trace
and
the
DELAY-TIME
MULTI
PLIER
control
are
used
to
make
the
time
measurements.
This
method
provides
a
very
high
degree
of
accuracy
when
care
is
taken
in
making
the
measurements.
The
method
is
sum
marized
as
follows:
1.
Place
the
HORIZONTAL
DISPLAY
switch
in
the
"B"
IN
TENSIFIED
BY
"A"
position
and
adjust
the
Time
Base
B
triggering
controls
for
a
stable
display
of
the
input
wave
form.
Adjust
the
Time
Base
A
STABILITY
control
for
free-
running
operation.
2.
Turn
the
intensity
down
until
the
brightened
portion
of
the
trace
is
easily
distinguishable.
Adjust
the
Time
Base
A
TIME/CM
control
to
reduce
the
brightened
area
to
a
small
spot
or
to
cover
as
small
a
portion
of
the
trace
as
possible.
3.
Using
the
DELAY-TIME
MULTIPLIER
control,
position
the
start
of
the
brightened
portion
to
the
beginning
of
the
in
terval
you
wish
to
measure.
Record
the
setting
of
the
DELAY
TIME
MULTIPLIER
control.
4.
Using
the
DELAY-TIME
MULTIPLIER
control,
position
the
start
of
the
brightened
portion
of
the
trace
to
the
end
of
the
interval
you
wish
to
measure.
Again
record
the
setting
of
the
DELAY
TIME
MULTIPLIER
control.
5.
Subtract
the
first
DELAY-TIME
MULTIPLIER
control
setting
from
the
second
and
multiply
the
result
by
the
setting
of
the
Time
Base
B
TIME/CM
or
DELAY
TIME
control.
The
figure
obtained
is
the
time
interval
between
the
two
events.
The
figure
obtained
is
within
1
%
regardless
of
whether
the
magnifier
is
on
or
off.
3-3

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