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Tektronix DC 502

Tektronix DC 502
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INTERNAL
ADJUSTMENTS
PROCEDURE
Services
Available
Tektronix,
Inc.
provides
complete
instrument
repair
and
adjustment
at
local
Field
Service
Centers
and
at
the
Factory
Service
Center.
Contact
your
local
TEKTRONIX
Field
Office
or
representative
for
further
information.
Test
Equipment
For
measurement
of
the
power
supply
voltages,
a
20,000
ohms/volt
VOM
will
give
satisfactory
measurements.
For
example,
Triplett
630
NA
multimeter.
For
1-MHz
frequency
measurement,
a
secondary
frequency
standard
or
other
frequency
source
having
a
stability
of
at
least
5
parts
on
10
7
(5
parts
in
10
8
if
measuring
optional
5
MHz
crystal
output)
is
recommended
for
accuracy.
Also
recommended
is
a
test
oscilloscope
with
a
bandwidth
of
at
least
1
MHz
and
a
stable
triggering
circuit
for
frequency-comparison
measurement.
Procedure
NOTE
The
performance
of
this
instrument
can
be
check
at
any
temperature
within
the
0°
C
to
+50°
C
range.
Make
any
adjustment
at
a
temperature
between
+20°
C
and
+30°C
(+68°
F
and
+86°
F).
The
DC
502
can
be
operated
either
fully
installed
in
a
TM
500
Series
Power
Module
or
connected
to
a
plug-in
extender
(TEKTRONIX
Part
No.
067-0645-01).
Power
Supply
Checks
and
Adjustment.
Connect
the
voltmeter
between
the
+15-volt
test
point
and
ground.
Adjust
R305
for
a
reading
of
+15
volts.
Then
check
the
+5-volt,
—
5.2-volt,
and
-10-volt
supplies
to
be
within
5%.
NOTE
i
f
the
instrument
is
operated
on
the
plug-in
extender,
vhe
+5-vo!t
supply
may
not
regulate.
Time-Base
Frequency
Check
and
Adjustment.
Connect
the
DC
502
1-MHz
time
base
reference
and
the
secondary
standard
to
the
oscilloscope
as
shown.
Adjust
the
oscillo
scope
to
display
several
complete
cycles.
To
determine
oscillator
error,
observe
the
rate
of
horizontal
drift
of
the
displayed
waveform.
Waveform
moving
to
the
right
indicates
that
the
time-base
frequency
is
<1
MHz;
to
the
left,
>
1
MHz.
The
period
in
seconds
for
the
waveform
to
move
the
width
of
one
cycle
is
equal
to
the
frequency
difference
in
parts
in
10
6
.
For
example,
if
the
waveform
drifts
to
the
right
at
a
rate
of
one
cycle's
width
every
10
seconds,
the
time-base
frequency
is
0.1
part
in
10
6
low.
Maximum
allowable
frequency
difference
is
1
part
in
10
5
(5
parts
in
10
7
for
the
optional
5
MHz
crystal).
Adjust
C201
for
no
drift.
+5
V
Test,
R322
—
10
V
Test,
R330
+15
V
Test,
R345
1-MHz
test
point
-5.2
V
Test,
R305,
C201,
R330
+15
V
Adjust
1-MHz
Clock
Adjust