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Tektronix 502A User Manual

Tektronix 502A
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Operating
Instructions
—
Type
502A
Fig.
2-4.
Inputs
to
the
vertical
amplifiers.
Waveforms
applied
to
input
connector
A
are
displayed
in
the
upright
position,
while
wave
forms
applied
to
input
connector
B
are
inverted.
Differential
inputs
must
be
connected
to
both
the
A
and
B
input
connectors
of
one
amplifier.
In
the
A
and
B
positions
of
the
input
selector
switch,
the
corresponding
waveforms
are
displayed
on
the
crt.
In
the
A-B
(DIFF)
position,
the
B
input
is
algebraically
added
to
the
A
input
and
the
difference
is
displayed.
This
feature
permits
you
to
elim
inate
common
mode
signals
within
specified
limits.
Input
Coupling
Input
signals
to
the
vertical
amplifiers
can
be
either
ac
or
d
c
coupled
by
placing
the
Input
Selector
switch
in
the
corresponding
positions.
DC
coupling
applies
both
the
ac
and
d
c
components
of
the
input
signal
to
the
vertical
amplifier
circuits.
This
permits
you
to
measure
the
d
c
voltage
level
as
well
as
the
amplitude
of
the
ac
component.
It
is
sometimes
neither
necessary
nor
desirable
to
display
the
d
c
component.
In
such
cases
ac
coupling
should
be
used.
With
ac
coupling,
a
capacitor
is
placed
in
series
with
the
input
connector
to
block
the
d
c
component
while
at
the
same
time
allowing
the
ac
component
to
be
displayed.
Fig.
2-5.
Rejection
of
a
common
mode
signal
by
the
differential
amplifier.
The
waveform
applied
to
input
connector
B
is
algebra
ically
added
to
the
waveform
applied
to
input
connector
A
and
the
resultant
waveform
is
displayed
on
the
screen
of
the
crt.
Input
Connections
Here
are
some
precautions
you
should
observe
in
connect
ing
your
oscilloscope
to
the
signal
source:
1.
Avoid
errors
in
readings
due
to
stray
electric
or
magne
tic
coupling
between
circuits,
particularly
in
the
leads
connected
to
the
input
connector.
In
general,
unshielded
leads
of
appreciable
length
are
unsuited
for
this
use.
When
shielded
leads
are
used,
the
shields
should
be
grounded
to
the
input
connector
shield
and
to
the
chassis
of
the
equipment
being
tested.
Coaxial
cables
are
recommended
for
many
purposes.
Special
care
must
be
taken
in
the
high
sensitivity
ranges
of
the
oscilloscope
due
to
the
low
signal
level
and
high
amplifier
gain.
2.
As
nearly
as
possible,
simulate
actual
operating
condi
tions
in
the
equipment
being
tested.
The
equipment
should
have
a
load
on
it
which
is
approximately
equal
to
the
load
encountered
in
normal
operation.
3.
Consider
the
effect
of
loading
upon
the
signal
source
due
to
the
input
circuit
of
the
oscilloscope.
The
circuit
at
the
input
connectors
can
be
represented
by
a
resistance
of
1
megohm
shunted
by
a
capacitance
of
47
pf.
With
a
few
feet
of
shielded
cable,
the
capacitance
may
well
be
100
pf
or
more.
In
many
cases,
the
effects
of
these
resistive
and
capacitive
loads
are
not
negligible,
and
to
minimize
them,
you
might
want
to
use
a
probe
in
the
manner
described
in
the
next
section.
Use
of
Probes
An
attenuator
probe
lessens
both
capacitive
and
resistive
loading,
at
the
same
time
reducing
sensitivity.
When
making
amplitude
measurements
with
an
attenuator
probe,
be
sure
to
multiply
the
observed
amplitude
by
the
attenuation
of
the
probe.
A
Type
P6006
Probe
is
furnished
as
an
accessory
to
the
Type
502A
Oscilloscope.
Connected
to
the
Input
connector
of
the
Type
5
0
2A,
the
probe
presents
an
input
characteristic
of
10
megohms
shunted
by
approximately
9
picofarads
and
has
an
attenuation
ratio
of
10:1.
The
maximum
voltage
which
may
be
applied
to
the
probe
is
600
volts.
Exceeding
this
rating,
either
in
peak
ac
volts
or
d
c
volts,
may
result
in
damage
to
the
components
inside
the
probe
body.
If
the
waveform
being
displayed
contains
fast
changing
portions,
it
is
generally
necessary
to
clip
the
ground
lead
of
the
probe
to
the
chassis
of
the
equipment
being
tested.
Select
a
ground
point
which
is
near
the
probe
connection.
Probe
Adjustment
An
adjustable
capacitor,
which
is
built
into
the
probe
body,
is
used
to
compensate
for
slight
variations
in
input
capacitance
from
one
instrument
to
another.
To
insure
the
accuracy
of
pulse
and
transient
measurements,
this
adjust
ment
should
be
checked
frequently.
To
make
this
adjustment,
set
the
AMPLITUDE
CALIBRATOR
and
SENSITIVITY
Controls
on
the
Type
502A
to
display
a
signal
of
suitable
amplitude.
Touch
the
probe
tip
to
the
CAL
OUT
Connector
and
adjust
the
TIME/CM
Control
to
display
several
cycles
of
the
waveform.
Loosen
the
locking
sleeve
several
turns.
(See
figure
2-6.)
Now
while
holding
onto
the
knurled
part
near
the
cable,
turn
2-3

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Tektronix 502A Specifications

General IconGeneral
BrandTektronix
Model502A
CategoryTest Equipment
LanguageEnglish

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