Adjustment
OPERATION
ON
210-250
VOLT
LINE
The
power
transformer
of
the
Type
511
A
is
wound
with
two
115
volt
primaries.
When
the
instrument
leaves
the
factory
the
primaries
are ordinarily
connected
in
parallel
for
105-125
volt
operation.
If
operation from
210-250
volt
lines
is
desired
remove
the
jumpers
con
necting
terminals 1
to 2
and
3
to 4.
Now
connect
termi
nals
2
and
3
together.
With
the
line
still
connected
to
terminals 1
and
4
the
instrument
is ready
for
210-250
volt
operation.
ADJUSTMENT
OF 225
VOLT REGULATED
SUPPLY
In
order
for
the
instrument to
perform
properly
it
is
necessary
that
the
225
volt
supply
be
within
plus
or
minus
5
volts
of
that
value.
This
should
be
checked with
an
accurate
voltmeter
and
corrected
if necessary
by
adjustment
of
the
potentiometer
R-159
on
the
power
supply
chassis
marked ADJ
TO
225
V. This
check
should
always
be
made
if
the
5651
tube
V-29
is
changed.
ADJUSTMENT
OF
SWEEP
SPEED CALIBRATION
If
the Cathode
Ray
Tube
is
replaced,
or
if
the Sweep
Amplifier
tubes
V
1
3
and
V
1
4 change
their
character
istics,
the
indicated
sweep
speeds
may
be
in
error.
This
may
be corrected by adjustment
of
the
potentiom
eter
on
the
chassis
marked
SWEEP
SPEED
ADJ.
(R42),
for
all ranges except
the
1
to
10 microsecond
range,
which
is
corrected by
varying
Cl
5
A
located
on
the
rear
section
of
the
Sweep
Range
Switch.
These
adjustments
may be
made with
the
aid
of an
accurately
calibrated oscillator. A
commonly
available
instrument
suitable
for
this
purpose
is
the
Army
Fre
quency
Meter
BC
221, or
the
Navy
equivalent,
Type LM.
If this type instrument
is
used,
set
the frequency
at
200
KC
and
connect it
to
the
Type
511-A
SIGNAL
INPUT.
With
the
SWEEP
SPEED
MULT,
at 1
and
the
SWEEP
RANGE
at 10 microseconds,
adjust R42
until
2
cycles
coincide with
the
10
cm.
scale.
Change
the
frequency
meter
setting to
2
me.,
set
the
SWEEP
SPEED
MULT,
at
2,
the
SWEEP
RANGE
at
1 microsecond
and
adjust
Cl
5
A
until
4
cycles
occupy
the
10
cm.
scale.
CAUTION
—
USE
NORMAL
INTENSITY,
AS
THE
CRT
DEFLECTION SENSITIVITY
IN
CREASES AT
MAXIMUM
INTENSITY.
USE
THE
MINIMUM
TRIGGER
AMPL.
SETTING
CONSISTENT
WITH
A
STABLE
PATTERN.
ADJUSTMENT
OF
INPUT ATTENUATOR
The
RC
compensated
attenuator
used
in
the
Type
511
A
is
really
two
attenuators
in
parallel,
one
a
re
sistive
divider
and
the
other
a
capacity
divider.
The
ratio
of
the
resistive
divider
is
maintained
by
the
use
of
accurate
resistors.
Since
the
stray
capacities
are
not
negligible
compared
to the
values
used
in
the
capacity
divider,
each
divider
incorporates
a
variable
ceramic
trimmer capacitor
in
one
arm.
To
make the
input
capac
ity
of
each
amplifier
and
that of
the attenuator
equal,
similar
capacitors
are
shunted
across
these
circuits
also.
The
easiest
way
to
make
these
adjustments
is
to
send
a
square
wave
through the
attenuator
and
observe
the
resulting waveshape
on
the
oscilloscope
itself.
When
the
capacity
and
resistive
dividers
have
the
same
ratio
the
square
wave
is
reproduced
correctly.
If the
capacity
divider
has a
lower
attenuation
ratio
than the
resistive
divider
a
spike
appears
on
the
corners.
If the
capacity
divider
has
a
higher
attenuation,
the
corners
are
rounded.
To
make
these
effects
more
pronounced
the
square
wave
frequency
should
be
such
that
one
cycle
is
from
4
to
20
times
the
time
constant
of
the
atten
uator.
In
the
case
of
the Type
51
1-A a
frequency
of
1000
cycles
is
satisfactory.
The
amplitude
of
the
square
wave
test
signal
should be
adjustable
from
1 to
50
volts
(peak
to
peak).
The
Tektronix
Type
104
and
Type
105
Square
Wave
Generators
are
suitable
for
this
purpose.
If
a
Tektronix
Type
512
Oscilloscope is
avaiable,
its
square wave
cali
brator
may
be
used.
A procedure
which
has proven
satisfactory
is
as
follows:
1.
Lay
a
metal
sheet
on
top of
the
instrument
to
simulate
the presence
of
the
case.
2.
Apply a
50
V square
wave
to
the
Signal
Input
connector,
set the
INPUT CHAN.
SEL.
to
VIA
COND.,
the
INPUT
ATTENUATOR
to
X2, and
ad
just
C37
(left
rear on attenuator).
3.
Reduce
the
square
wave
amplitude
to
10
V.,
move
the
INPUT CHAN. SEL. to 1
STAGE,
and
adjust
C42 (left
on
Input
Chan.
SeL).
4.
Move
INPUT
ATTEN.
to
X4,
increase
square wave
to
20V,
and
adjust
C34
(center
rear
on
attenu
ator).
5.
Move
INPUT
ATTEN.
to
X8,
increase
square
wave
to
40 V,
and
adjust
C31
(right
rear
on
attenuator).
6.
Reduce
the
square
wave
amplitude
to
1
V, move
the
INPUT
CHAN. SEL.
to
2
STAGES,
INPUT
ATTEN.
to
X2,
and adjust
C44
(right
on
input
chan. sel
.).
7.
Move
square
wave signal
from
SIGNAL
INPUT
to
the
probe,
apply
a
5
V
signal,
set
INPUT
ATTEN
to
X
1
,
and adjust
the
probe
compensating
capaci
tor.
8.
Move
INPUT
ATTEN.
to
X2
and
adjust
C38
(left
front
on
attenuator),
using
a
10
V
signal.
9.
Move
INPUT
ATTEN.
to
X4
and adjust
C35
(center
front
on
attenuator),
using
a
25
V
signal.
10.
Move
INPUT
ATTEN.
to
X8
and
adjust
C32
(right
front
on
attenuator),
using
a 50
V
signal.
ADJUSTMENT OF
VIDEO
AMPLIFIER H. F.
RESPONSE
The
video
amplifier
in
the
Type
511A
employs
a
four
terminal
coupling
network which is
adjusted
at
the
factory
for optimum
transient
response,
rather
than
flattest
frequency
response.
This
is
done
by
observing
SECTION 4,
PAGE 19
TYPE
511-A, 511-AD
Содержание 511A
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Страница 39: ...ALLIGATOR CLIP BANANA PLUG INSULATOR Fig 41 Input Probe disassembled SECTION 4 PAGE 21 TYPE 511 A 511 AD ...
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Страница 41: ...X Fig 43 Interior view left side SECTION 4 PAGE 23 TYPE 511 A 511 AD ...
Страница 42: ...E CI5E Fig 44 Sweep chassis bottom view R63 C2I TYPE 511 A 511 AD SECTION 4 PAGE 24 ...
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