Section
1
Characteristics
General
Information
The
Tektronix
Type
561
A
Oscilloscope
is
essentially
in
indicator
unit
with
provision
for
two
of
a
number
of
plug
in
units.
The
plug-in
unit
in
the
right-hand
opening
controls
the
horizontal
(X-axis)
deflection, and
the
plug-in
unit
in
the
left-hand
opening
controls
the
vertical (Y-axis)
deflectic n.
The
plug-in units
can
be
selected from
any
of
the
Tektronix
'2'
Series
or
'3'
Series
groups
to
provide
the
desired
oscillo
scope
performance.
Bandpass,
Risetime,
Vertical
Deflection
Factors,
Input
Impedance,
and
Sweep
Rates
are
determined
by
the
plug
in
units
used.
Cathode-Ray
Tube
Type
—
T561
(rectangular
ceramic-envelope).
Phosphor
—
P31.
Unblanking-
—
Deflection
type,
dc-coupled,
with
grid
int<
n-
sification.
Graticule
—
Variable
edge
lighted "no parallax"
internal
graticule.
Marked in
8 vertical and
10
horizontal
divisions
with
each
major
division
divided
into
5
minor
divisions
on
centerline.
Accelerating
potential—
-3.5kv.
Usable
viewing
area
—
8
divisions
vertical
by
10
d
vi
sions
horizontal.
Deflection plate
sensitivities
—
18.5
to
20.5
volts
per d vi
sion
vertical,
and
17.5
to
19.3
volts
per division
horizon'al.
Calibrator
Waveform
—
Square
waves
at
the
line
frequency.
Output
voltage
—
0.2
millivolt
to
100
volts, peak-to-peak,
in
18
steps.
Accuracy—
Peak-to-peak
amplitude
within
3%
of
indi
cated
voltage.
Risetime
—
Typically
4
microseconds.
Power
Supplies
Electronically
regulated
for
stable
operation
with
widely
varying
line
voltages
and
loads.
Line
voltage
requirements
—105
to
125
volts,
or 210
to
250
volts,
rms,
50
to
400
cps,
single-phase
ac.
Fuse-
—2-amp
slow-blowing
type
for 117
volts, 1-amp
slow-blowing
type
for
234
volts.
Ventilation
Convection
air
cooled.
Thermal
cutout
interrupts
insrru-
ment
power
in
the
event
of
overheating.
Construction
Aluminum-alloy
chassis
and
2-piece
cabinet.
Photo-etched
anodized panel,
blue vinyl paint
over
tex
tured aluminum
on
cabinet.
Dimensions
— Height
13'/
2
inches,
width
9
3
/4
inches,
and
depth
21
’/2
inches.
Weight
—
30
’/
2
pounds,
indicator
unit
only.
1-1
