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Tektronix 502A

Tektronix 502A
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Operating
Instructions
—
Type
502A
(Do
not
adjust
the
vertical
positioning
control
after
this
reference
point
has
been
established.)
3.
Remove
the
probe
tip
from
ground
and
connect
the
probe
to
the
signal
source.
Adjust
the
TRIGGERING
LEVEL
Control
for
a
stable
display.
4.
Measure
the
vertical
distance
in
centimeters
from
the
point
to
be
measured
to
the
ground
reference
line
by
use
of
the
graticule.
5.
Multiply
the
setting
of
the
SENSITIVITY
Control
by
the
distance
measured
to
obtain
the
indicated
voltage.
6.
Multiply
the
indicated
voltage
by
the
attenuation
factor
of
the
probe
you
are
using
to
obtain
the
true
voltage
with
respect
to
ground.
As
an
example
of
this
method,
assume
that
you
are
us
ing
a
10X
probe
and
a
sensitivity
of
.2
volts
per
centimeter
and
that
after
setting
the
reference
line
at
the
bottom
of
the
graticule,
you
measure
a
distance
of
8
centimeters
to
the
point
you
wish
to
measure.
In
this
case
then,
8
centimeters
times
.2
volts
per
centimeter
gives
you
an
indicated
voltage
of
1.6
volts.
Since
the
voltage
point
is
above
the
ground
reference
line,
the
polarity
is
indicated
to
be
positive.
The
indicated
voltage
times
the
probe
attenuation
foctor
of
10
then
gives
you
the
true
voltage
of
positive
16
volts.
You
should
remember
in
determining
the
polarity
of
voltages
measured
in
this
fashion
that
inputs
applied
to
the
B
input
connectors
are
inverted
on
the
face
of
the
crt.
Consequently,
the
apparent
polarity
of
these
inputs
is
op
posite
the
true
polarity.
To
prevent
possible
confusion
as
to
polarity
it
is
usually
best
to
use
the
A
input
connectors
for
voltage
measurements
with
respect
to
ground.
Time
Measurement
Accurate
elapsed
time
or
time
interval
measurements
can
be
made
by
utilizing
the
calibrated
timebase
feature
of
the
Type
502A
Oscilloscope.
The
sweeps
are
calibrated
so
that
the
beams
are
deflected
across
the
screen
at
known
rates.
Since
the
beam
travels
completely
across
the
screen
in
a
known
period
of
time,
the
time
required
for
the
beam
to
travel
any
portion
of
the
distance
can
be
determined.
By
measuring
the
horizontal
distance
between
points
on
the
displayed
waveform,
and
by
knowing
the
sweep
rates,
you
can
determine
the
time
interval
between
the
two
points.
For
accurate
measurements
be
sure
the
same
reference
point
is
used
on
both
pulses
and
the
VARIABLE
TIME/CM
Control
is
in
the
CALIBRATED
position.
The
method
for
measuring
a
time
interval
is
as
follows:
1.
Using
the
graticule,
measure
the
horizontal
distance
in
centimeters
between
two
points
whose
time
interval
you
wish
to
find.
2.
Multiply
the
distance
measured
by
the
setting
of
the
TIME/CM
control
to
obtain
the
apparent
time
interval.
3.
Divide
the
apparent
time
interval
by
the
magnification
indicated
by
the
setting
of
the
HORIZONTAL
DISPLAY
switch
to
obtain
the
correct
time
interval.
Frequency
Measurement
The
frequency
of
a
periodically
recurrent
waveform
can
be
determined
if
the
time
interval
(period)
of
one
complete
Fig.
2-12.
Measuring
the
time
interval
(period)
of
one
complete
cycle
of
a
periodically
recurrent
waveform.
The
horizontal
distance
in
centimeters
of
one
complete
cycle
(in
this
case
3
centimeters)
is
multiplied
by
the
setting
of
the
TIME/CM
control
and
is
divided
by
the
sweep
magnification
to
obtain
the
time
interval.
The
fre
quency
of
the
waveform
is
the
reciprocal
of
its
time
interval.
cycle
of
the
waveform
is
known.
This
time
interval
can
be
measured
by
means
of
the
procedure
described
in
the
preced
ing
paragraph.
The
frequency
of
a
waveform
is
the
recipro
cal
of
its
time
interval
Using
DC
BAL
and
FINDER
Controls
It
is
best
to
disconnect
the
input
signal,
unless
the
approximate
amplitude
of
it
is
known.
If
the
amplitude
of
the
input
signal
is
known
then
set
the
SENSITIVITY
Control
for
a
crt
display
of
two
or
three
centimeters
and
follow
the
instructions
for
no
input
signal.
With
no
input
signal,
turn
the
TRIGGERING
LEVEL
to
RECURRENT,
the
single
sweep
MODE
switch
to
NORMAL
and
the
INTENSITY
Control
to
a
reasonable
level.
The
above
control
settings
are
to
insure
that
a
trace
can
be
seen,
when
it
is
found.
Set
the
vertical
POSITION
Control
of
the
proper
beam
to
its
midrange
position.
With
the
SENSITIVITY
Control
in
the
.2
VOLTS
PER
CM
position.
If
no
input
signal
is
connected
to
the
Type
502A,
change
the
SENSITIVITY
Control
to
the
.1
m
VOLTS
PER
CM
position
and
depress
the
FINDER
Button.
The
trace
should
now
be
seen
on
the
crt.
Now
turn
DC
BAL
Control
in
either
direction
until
a
"fast
area
”
is
seen.
A
'fast
area
”
is
an
area
of
the
DC
BAL
Control
where
the
trace
will
move
a
large
distance
for
a
very
small
movement
of
the
DC
BAL
Control.
When
the
"fast
area"
of
the
DC
BAL
Control
is
found,
the
trace
should
be
positioned
in
the
center
of
this
area
with
the
DC
BAL
Control.
The
FINDER
Button
may
now
be
released
and
the
trace
positioned
to
the
proper
place
on
the
graticule.
2-9

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