Tektronix 7B10 User Manual

Operating
Instructions—
7B10
Operators
Normal
The NORM
MODE
provides
a
triggered
display
with
the
correct
settings of
the LEVEL
control
whenever
an
adequate trigger
signal
is
applied.
The
TRIG'D
light
indicates when
the
display
is
triggered.
The
normal
trigger
mode
must
be
used
to
produce
triggered
displays
with
trigger
repetition
rates
below
about
30
hertz.
When
the
TRIG'D
light
is off,
no
trace
is
displayed.
Single
Sweep
When
the signal
to be
displayed
is not
repetitive
or
varies
in
amplitude,
waveshape,
or
repetition
rate,
a
conventional
repetitive
type
display
may
produce
an
unstable
presentation.
Under
these
circumstances,
a
stable
display can
often
be obtained
by using
the
single-
sweep
feature of
this
unit. The
single-sweep
mode
is
also
useful
to photograph
non-repetitive
or
unstable
displays.
To
obtain
a single-sweep
display
of
a
repetitive
signal,
first
obtain the
best
possible
display in
the
NORM
MODE.
Then, without
changing
the
other
TRIGGERING
controls,
press the SINGLE
SWP RESET
button.
A
single
trace
is
presented
each time
this
button
is
pressed.
Further
sweeps
cannot
be
presented
until
the
SINGLE
SWP
RESET
button
is
pressed
again. If
the
displayed
signal
is
a
complex
waveform
composed
of varying
amplitude
pulses,
successive
single-sweep
displays
may
not
start
at
the
same point
on the
waveform.
To
avoid
confusion
due
to
the crt
persistence,
allow the
display
to
disappear
before
pressing
the
SINGLE
SWP
RESET
button
again.
At
fast
sweep
rates, it
may
be difficult
to view
the
single-
sweep
display.
The
apparent
trace
intensity
can
be
increased
by
reducing
the
ambient
light level
or by
using
a viewing
hood
as
recommended
in the
mainframe
instruction
manual.
When using
the
single-sweep
mode
to
photograph
waveforms,
the
graticule
may have
to be
photographed
separately
in the
normal
manner
to
prevent
over
exposing
the
film.
Be sure
the
camera
system
is
well
protected
against stray
light,
or
operate
the
system
in
a
darkened
room.
For
repetitive
waveforms,
press the
SINGLE
SWP RESET
button
only
once
for
each
waveform
unless
the signal
is
completely
symmetrical.
Otherwise,
multiple
waveforms
may
appear
on the
film.
For
random
signals, the
lens
can
be left
open until
the
signal
triggers
the unit.
Further
information
on
photographic
techniques
is given
in
the
appropriate
camera
instruction
manual.
TRIGGERING
COUPLING
The
TRIGGERING
COUPLING
push
buttons
select
the
method
in which
the
trigger
signal
is
connected
to
the
trigger
circuits.
Each
position
permits
selection
or
rejection
of
some
frequency
components
of
the
signal
which
triggers
the
sweep.
AC
AC
COUPLING
blocks
the
dc
component
of
the
trigger
signal.
Signals
with
low-frequency
components
below
about
30 hertz
are
attenuated.
In
general,
AC
COUPLING
can
be used
for most
applications.
However,
if
the
signal
contains
unwanted
frequency
components
or if
the
sweep
is
to be
triggered
at a low
repetition
rate
or
dc
level,
one of
the other
COUPLING
switch
positions
will
provide
a better
display.
AC LF
REJ
AC LF
REJ
COUPLING
rejects
dc,
and
attenuates
low-
frequency
trigger
signals
below
about
50
kilohertz.
Therefore,
the
sweep is
triggered
only
by the
higher-
frequency
components
of the
trigger
signal.
This
position
is
particularly
useful
for
providing
stable
triggering
if the
trigger
signal
contains
line-frequency
components.
Also,
the
AC LF
REJ
position
provides
the
best
alternate-mode
vertical
displays
at fast
sweep
rates
when
comparing
two
or more
unrelated
signals.
AC HF
REJ
AC HF
REJ
COUPLING
passes
all
low-frequency
signals
between
about
30 hertz
and
30
kilohertz.
Dc is
rejected
and
signals
outside
the
above
range
are
attenuated.
When
triggering
from
complex
waveforms,
this
position
is
useful
to provide
a
stable
display
of
the
low-frequency
components.
DC
DC
COUPLING
can
be
used
to
provide
stable
triggering
from
low-frequency
signals
which
would
be
attenuated
in
the
other
COUPLING
switch
positions.
DC
COUPLING
can
be
used to
trigger
the
sweep
when
the
trigger
signal
reaches
a dc
level
set
by the
LEVEL
control.
When
using
internal
triggering,
the
setting
of
the
vertical
unit
position
control
affects
the
triggering
point.
TRIGGERING
SOURCE
The
TRIGGERING
SOURCE
push
buttons
select
the
source
of
the
trigger
signal
which
is
connected
to
the
trigger
circuits.
Internal
The
INT
position
connects
the
trigger
signal
from
the
vertical
plug-in
unit.
Further
selection
of
the
internal
trigger
signal
may
be
provided
by
the
vertical
plug-in
unit
or
by the
mainframe;
see
the
instruction
manuals
for
these
instruments
for
more
information.
For
most
applications,
the
internal
source
can
be
used.
However,
some
applications
require
special
triggering
which
cannot
be
obtained
in
the INT
position.
In
such
cases,
the
LINE
or
EXT
positions
of
the
SOURCE
switches
must
be
used.
Line
The
LINE
position
connects
a
sample
of
the
power-line
voltage
from
the
mainframe
to the
trigger
circuit.
Line
triggering
is
useful
when
the
input
signal
is
time-related
(multiple
or
submultiple)
to
the line
frequency.
It
is
also
useful
for
providing
a
stable
display
of
a
line-frequency
component
in
a
complex
waveform.

Tektronix 7B10 Specifications

General

Brand	Tektronix
Model	7B10
Category	Test Equipment
Language	English