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Tektronix 585 - Page 20

Tektronix 585
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Operating
Instructions
—
Type
585
to
obtain
the
actual
time
required
for
the
spot
to
move
one
centimeter.
For
example,
if
the
TIME/CM
control
is
set
at
5
MILLISEC,
the
actual
time
per
centimeter
is
5
milliseconds
divided
by
5,
or
1
millisecond
per
centimeter.
(See
Figure
2-13).
Output
Waveforms
For
external
use,
the
Time
Base
A
sawtooth
sweep
wave
form
is
available
at
the
SAWTOOTH
A
connector
on
the
front
panel.
This
positive
going
waveform
starts
at
about
—
2
volts
and
rises
linearly
to
a
peak
amplitude
of
about
140
volts.
The
SAWTOOTH
A
waveform
is
d
c
coupled.
The
start
and
duration
of
the
rising
part
of
the
sawtooth
coincides
with
the
start
and
duration
of
the
Time
Base
A
horizontal
sweep
on
the
crt.
The
rate
at
which
the
saw
tooth
rises
is
determined
by
the
setting
of
the
Time
Base
A
TIME/CM
control.
Two
positive
rectangular
waveforms
are
available
at
the
+GATE
A
and
+
GATE
B
connectors.
These
waveforms
start
at
ground
and
rise
to
about
30
volts.
The
starting
time
and
duration
of
each
pulse
coincides
with
the
starting
time
and
duration
of
the
particular
Time
Base
A
or
B
sweep
generator
sweep
action.
Amplitude
Calibrator
The
AMPLITUDE
CALIBRATOR
provides
a
convenient
source
of
square
waves
of
known
amplitude
at
a
frequency
of
approximately
1
kc.
The
square-waves
are
used
primarily
to
compensate
attenuators
or
probes
and
to
verify
the
amplitude
calibration
of
the
vertical
deflection
system
of
the
oscilloscope
and
plug-in
unit.
Calibrator
square-waves
are
adjustable
from
0.2
millivolts
peak-to-peak
to
100
volts
peak-to-peak
in
18
steps.
The
amplitude
is
controlled
by
the
setting
of
the
AMPLITUDE
CALIBRATOR
switch
and
is
accurate
within
3%
of
the
AMPLITUDE
CALIBRATOR
switch
setting,
when
the
output
is
connected
to
a
high
impedance
load.
Intensity
Modulation
The
crt
display
of
the
Type
585
Oscilloscope
can
be
intensity
modulated
by
an
external
signal
to
display
addi
tional
information.
This
is
done
by
disconnecting
the
ground
ing
bar
from
the
EXTERNAL
CRT
CATHODE
connector
at
the
rear
of
the
instrument
and
connecting
the
external
signal
to
the
two
terminals.
To
make
very
accurate
time
measurements
from
the
crt
display,
you
may
intensity
modulate
the
beam
with
time
markers
and
make
measurements
directly
from
the
time
markers
presented
on
the
crt.
A
signal
of
approximately
+
2
to
+
25
volts
is
required
to
cut
off
the
crt
beam
from
normal
intensity.
Restore
the
grounding
bar
to
the
EXTERNAL
CRT
CATHODE
connector
during
normal
operation
to
avoid
uneven
trace
intensity
at
high
sweep
rates.
Dual-Trace
Displays
When
using
the
Type
81
Plug-In
Adapter
with
a
Type
CA
Plug-In
Unit,
and
the
Type
82
Plug-In
Unit
(without
the
Type
81)
two
separate
traces
may
be
obtained
on
the
face
of
the
crt.
This
permits
display
of
two
functions
simultane
ously.
Detailed
instructions
for
operating
either
plug-in
unit
are
contained
in
the
appropriate
Instruction
Manual.
2-12

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