Operating
Instructions
—
Type
535A
The
graticule is
illuminated by two lamps located at the
top edge of
the graticule.
This illumination
can be
con
trolled
so that
the
graticule markings appear either red
or
white,
as desired. The graticule markings are
changed
from
red
to
white or from white to red by removing the
graticule cover and
rotaing the
graticule through 180°
about
an axis
through the center
of the graticule. As a
general
rule, white graticule markings are
superior to red
for photographic purposes.
Graticule
illumination is adjusted by the SCALE ILLUM
control
located just
under
the oscilloscope screen. Rotating
the
control
clockwise increases the
brightness of the grati
cule markings
and rotating the control counterclockwise
decreases
the brightness. For convenience in photographic
work,
the SCALE ILLUM control is marked in approximate
f-stops.
These
f-stops can be used with a shutter speed of
1
second when TRI-X film
is used
or with a shutter speed
of
10 seconds when Type
44
Polaroid film
is used. Regard
less
of
the type of film used, white graticule markings should
be
used.
To
obtain satisfactory waveform photographs, the
intensity
of
the trace must approximately match the bright
ness
of
the
graticule markings.
Positioning Controls
Three
controls are used with the Type 535A Oscilloscope
to
allow
you to position the trace to the desired point on
the oscilloscope screen.
Two
of
these controls are used to
set
the horizontal position of the trace and are located
on
the front panel of the instrument. The third control is
used
to set the vertical position of the trace and is located
on
the front
panel of the plug-in unit used with the oscillo
scope.
(The Type
53/54C and
Type CA Dual-Trace Plug-In
Units
have
two Vertical
Positioning controls.)
The
two HORIZONTAL
POSITION controls cause the
trace
to
move to the right when they are rotated in the
clockwise
direction and to the left when they are rotated
counterclockwise.
The
combination of
the two
controls has
a
total
positioning
range
of approximately 12 centimeters
with
the sweep
magnifier off or approximately 60 centi
meters
with
the sweep
magnifier on. The
black HORIZON
TAL
POSITION control has
approximately three times the
range of
the red VERNIER control.
The fine range
of adjust
ment
of
the VERNIER control
makes this control particularly
useful
whenever fine horizontal positioning is required, as
for
example, when
the sweep magnifier is used.
The
vertical positioning
control has
sufficient range to
allow
the trace
to be positioned completely
off the top or
bottom of
the
screen or
to any intermediate point. The
trace
moves
up when
the control
is rotated clockwise and
down when
the control
is rotated counterclockwise.
Beam Position
Indicators
Four
small indicator lights located just above the
oscillo
scope
screen indicate the position of
the spot
or trace.
When one
of
these lamps is lit, it indicates that the trace is
off-centered
in
the direction of the arrow. These four lights
allow you
to position the spot to the center of the screen
even
though the intensity is so low that the trace is not vis
ible.
When the sweep
is running, the spot moves from the
left
side of the screen to the right and may cause both
horizontal
lamps to light each time the sweep runs.
Input
Signal
Connections
The electrical
waveform to be observed is applied to one
of
the
plug-in unit input connectors. The waveform is then
connected
through
the
vertical-deflection system
of the
plug-in unit
and
the
oscilloscope to cause the spot to be
deflected
vertically
and to trace out the waveform on the
screen
of the crt. The
vertical size of the displayed wave
form
is
adjusted
with the plug-in unit VOLTS/CM
switch.
The
VOLTS/CM
switch
is an accurately calibrated control which,
when used
with the graticule,
allows you to make precise
voltage
measurements from the displayed waveforms. The
operation of other plug-in unit controls varies between plug
in
units. For information regarding the operation of these
controls,
refer
to
the instruction manual for the plug-in unit
you are using.
Certain
precautions must
be taken when you are con
necting
the oscilloscope to the input signal source to in
sure that
accurate information is
obtained from the oscillo
scope
display. This is
particularly true when you ore ob
serving low-level
signals or
waveforms containing high- or
extremely low-frequency components. For applications
where
you are observing
low-level
signals, unshielded input
leads
are entirely unsatisfactory due to their tendency to
pick
up stray
signals which produce erroneous oscilloscope
displays.
Shielded cables should be used
whenever possible,
with
the shield connected to the chassis of both the oscillo
scope and
the
signal source. Regardless of
the type of input
lead
used,
leads should be kept as short as possible.
Distortion
of
the
input
waveform may result if very low-
frequency
input signals
are ac coupled into the oscilloscope,
if
high-frequency waveforms are not properly terminated,
or
if
the input waveform contains high-frequency compon
ents
which
exceed the pass band
of the oscilloscope and
plug-in unit
combination. You must be aware of the limita
tions
of
the instrument.
In
analyzing the displayed waveform, you must con
sider
the
loading effect that the oscilloscope has on the
input-signal
source.
In
most cases this loading effect is
negligible;
however in some applications, loading
caused
by
the oscilloscope may materially alter the results obtained.
In
such cases
you may wish to reduce the amount of load
ing
to a negligible amount through the use of a probe.
Use
of Probes
Occasionally
connecting the input of an oscilloscope to a
signal
source loads
the source sufficiently to
adversely affect
both
the
operation of
the
source and the waveform dis
played
on the
oscilloscope. In such cases an attenuator
probe
may be used to decrease both the capacitive and
resistive
loading
caused
by the oscilloscope to a negligible
value.
In addition
to
providing isolation of the oscilloscope from
the
signal source, an attenuator probe also decreases the
amplitude
of the displayed
waveform by the attenuation
factor
of
the probe.
Use of a
probe allows you to increase
the vertical-deflection
factors
of the oscilloscope to observe
large-amplitude
signals which are beyond the normal limits
of
the oscilloscope and plug-in combination. Signal ampli
tudes,
however,
must be limited to the maximum allowable
value
of
the probe used.
2-2
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 ...
