Calibration
Procedure—Type
535A
2
^seconds
per centimeter and
repeat the procedure. This
time,
however
try to adjust the capacitors for a smooth
transition
from bump to bump,
while at the same time
maintaining
a satisfactory level. The important thing to re
member
is to reduce the amplitude of all of the bumps by
the
same amount and try to achieve a perfectly straight line
at
this time.
Removing
the Bumps
and Wrinkles
After
you
have established
a level display with the ampli
tude
of
the bumps and wrinkles reduced to within a trace
width
of
the level
line,
you can start to remove the wrinkles
and
bumps over
smaller sections of the display. It is usually
best
to start at the terminated end of the delay and work
toward
the crt end.
Set
TIME/CM switch at .5
µ
SEC.
and
proceed to
remove
the bumps
caused by
the
termination network. Do not try to
arrive
at
a perfectly straight line during your first attempt.
Just
reduce
the bumps by one-half. Then advance to the
first
group
of 4 or
5 capacitors in the delay line
and adjust
them
for a smooth line over the portion of the display that
they
affect.
Keep in
mind that each capacitor will only
re
quire a
slight adjustment—a mere "touch”—and that
it is the
combined
affect
of
the group of capacitors that you should
be concerned with.
While you
are adjusting a group of
capacitors
to remove
a
bump
or wrinkle, be sure to frequently
turn to a sweep
rate of
2
or 5 microseconds/centimeter and check the level
of
the display.
Advance
along the delay line
from each group of capaci
tors
to the next until you have traversed the entire length.
Then,
turn
the TIME/CM switch to
.02
µ
SEC
and
repeat the
process.
This time, however, you must be
extra careful. The
capacitors
that require adjustment will only need a
slight
touch—to do
otherwise might
nullify
al!
of
your efforts up
to
this point. Be sure to check the level of the display fre
quently.
It is
very easy to concentrate on removing a
particularly
stubborn bump
and, in so doing, introduce
an
upward or downward
slope in
the display.
At
this point in the adjustment procedure, it will not be
necessary
to adjust every capacitor. Touching up here and
there
will
probably produce
the desired results.
Adjusting
the
High
Frequency Compensation
If
you have successfully completed the adjustment pro
cedure
up to this point, the
display should be level and free
of bumps
and wrinkles with a pronounced
rolloff on the
leading
edge. During this final part of the adjustment pro
cedure,
you
will strive for a square corner on the leading
edge,
while at the same time maintaining the proper level
without
introducing
wrinkles or bumps.
Set
the
TIME/CM switch at .2
µ
SEC
and
position
the dis
play
to afford
a good
view
of the leading edge and cor
ner.
The inductors in the vertical amplifier
and near the
crt affect
this portion of the waveform. The delay line
capacitors
nearest
the crt also affect the leading edge of
the
waveform.
It is important that
you adjust each pair
of inductors
in conjunction with each
other. Each inductor
should
be set
at
the same
position as its corresponding-op
posite
inductor.
Adjust
the inductors,
in
pairs for the squarest possible
corner. It
may be necessary to readjust the first two or three
capacitors
closest
to the crt in order
to achieve a wrinkle-
free
corner.
At
this time
the
displayed
waveform should be level on
top,
there should be virtually no bumps or
wrinkles, and
the
risetime of the displayed waveform should be within
specifications
for the instrument. A risetime check on the
displayed
waveform
gives a very
good check on
the com
pleteness
of
the adjustments.
BANDPASS CHECKS
Install
a
properly
calibrated Type K Unit in the oscillo
scope and
connect the
output cable
from the Constant-
Amplitude Signal
Generator to the
INPUT Connector of the
Type K Unit.
Set
the front-panel
controls as follows:
TRIGGERING
MODE
AC FAST, AC
SLOW or DC
STABILITY
full
right
TRIGGERING
LEVEL
any
position
TRIGGER
SLOPE
INT.
(+ or -)
TIME/CM
1 MILLISEC
VARIABLE
CALIBRATED
HORIZONTAL
DISPLAY
A
Type
K
Unit
AC/DC
DC
VOLTS/CM
.05
VARIABLE
CALIBRATED
Set
the
frequency
controls
on the Signal GENERATOR
for
an output
frequency of
500 kc, and adjust the ampli
tude
controls
for a
vertical deflection of exactly 6 centi
meters. Position
the
display on
the
crt (with the VERTICAL
POSITION control)
so that
the
deflection extends exactly
from
the top graticule mark to
the
bottom graticule mark.
Then
increase the
output frequency
of
the Signal
Gen
erator
to 15 mc (make sure the VOLTS/CM and VARIABLE
controls
are
set at .05 and CALIBRATED, respectively);
the
deflection
should be
at least 4.2 centimeters at 15 mc. If
not,
the Vertical Amplifier and the Delay Line (and possible
the Type K
Unit) are in
need of further adjustment.
6-11
Содержание 535A
Страница 2: ......
Страница 4: ...Type 535A ...
Страница 28: ...Circuit Description Type 535A 4 2 Fig 4 1 Simplified Type 535A Vertical Amplifier ...
Страница 30: ...Circuit Description Type 535A 4 4 Fig 4 2 Simplified Time Base Trigger Circuit ...
Страница 32: ...Circuit Description Type 535A Fig 4 3 Simplified Time Base Generator 4 6 ...
Страница 34: ...Circuit Description Type 535A 4 8 Fig 4 4 Simplified Delay Pickoff Circuit ...
Страница 38: ...Circuit Description Type 535A Fig 4 6 Simplified Alternate Trace Operation Circuitry 4 12 ...
Страница 39: ...Circuit Description Type 535A 4 13 ...
Страница 41: ...Circuit Description Type 535A Fig 4 8 Simplified Low Voltage Power Supply 4 15 ...
Страница 42: ...Circuit Description Type 535A 4 16 Fig 4 9 Simplified Calibrator Circuit ...
Страница 44: ...Circuit Description Type 535A Fig 4 10 Simplified Cathode Ray Tube Circuit 4 18 ...
Страница 126: ...MRU ll IG 61 O Z ...
Страница 138: ...C897 R896 R891 R890 R889 R888 R887 R886 R885 AMPLITUDE CALIBRATOR SWITCH Bottom View 535A A ...
Страница 140: ...C t Aao 3 ELEV 1 TERM 27 TERM 2e TIME BASE B CHA S5 S TYPE 3 5 C S C S C C P E R E A T ER WIRING DIAGRAM ...
Страница 143: ...FIG 1 FRONT SWITCHES TVDC COCA ocril I iCrODC ...
Страница 144: ...70 ...
Страница 145: ...1 FIG 3 SWEEP CHASSIS HIGH VOLTAGE BOARD DELAY SWEEP CHASSIS ...
Страница 146: ...1 FIG 4 POWER CHASSIS RECTIFIER MOUNTING PLATE A ...
Страница 147: ...3 34 79 ...
Страница 148: ...TYPE 535A OSCILLOSCOPE ...
Страница 149: ......
Страница 150: ...FIG 7 CABINET FRAME RAILS ...
Страница 152: ...FIG 8 STANDARD ACCESSORIES 6 TYPE 535A OSCILLOSCOPE ...
