Tektronix 7B10 User Manual

Operating Instructions—
7B10
Operators
TRIGGERING
FUNCTIONS
Perform
the
following
procedure
to obtain
a
triggered
sweep
and
to
demonstrate
the
functions
of the
related
controls:
1.
Obtain
a display
as
described
in
the
preceding
Normal
Sweep
procedure.
2. Turn
the
LEVEL
control
fully
counterclockwise
to
obtain
a free-running
sweep.
3.
Slowly
turn
the
HOLD
OFF
control
clockwise
and
note
that
a stable
display
can
be
obtained
at several
positions
of the
HOLD
OFF
control.
Return
the
HOLD
OFF
control
to the
fully
counterclockwise
(MIN)
position.
NOTE
The
HOLD
OFF
control
varies
the
sweep
hold-
off
time
which
effectively
changes
the
repetition-rate
of the
horizontal
sweep
signal.
However,
Its
primary
function
is
to
obtain
a
stable display
of
complex
waveforms
which
are
otherwise
difficult
to
trigger.
4.
Press the
AC,
AC HF
REJ,
and
DC
COUPLING
buttons
for
both the
+
and
-
positions
of
the
SLOPE
switch
and
check
for
a stable
display
(LEVEL
control
may
be
adjusted,
if
necessary,
to
obtain
a
stable
display).
5. Apply
the
0.4-volt,
1
kilohertz
signal
from
the
mainframe
calibrator
to the
amplifier
unit
and
to the
EXT
TRIG
IN
connector,
6. Press
the EXT
SOURCE
button
and
set the
amplifier
unit
deflection
factor
for
a
4-division
display.
7.
Press the
AC, AC
HF REJ,
and DC
COUPLING
buttons
for both
the
+
and
-
positions
of
the
SLOPE
switch
and
check for
a
stable
display
(LEVEL
control
may
be
adjusted, if
necessary).
8.
Press the
AC
COUPLING,
INT
SOURCE,
and
NORM
MODE
buttons.
Adjust the
LEVEL
control
for
a
stable
display.
9.
Press the
AUTO
MODE
button
and
adjust the
LEVEL
control for
a free-running
display.
10.
Press the
NORM
MODE
button
and
check
for
no
display.
1
1 . Adjust
the LEVEL
control
for
a stable
display
and
press the
SINGLE
SWP
MODE
button.
12.
Note
that one
trace
occurs
when
the
SINGLE
SWP
button
is
pressed
again.
13.
Disconnect the
mainframe
calibrator
signal
from
the
amplifier unit
input
and
press
the
SINGLE
SWP
button.
Check
for no
display
and note
that
the READY
indicator
is
lit.
14.
Note that
one
trace
occurs
and
that
the
READY
indicator
extinguishes
when
the
mainframe
calibrator
signal is
reconnected
to the
amplifier
unit
input.
DETAILED
OPERATING
INFORMATION
TRIGGERING
SWITCH
LOGIC
The
MODE, COUPLING,
and
SOURCE
push
buttons
of the
TRIGGERING
switches
are arranged
in
a
sequence which
places the most-often
used
position
at the
top of
each
vertical
row of
push buttons.
With
this
arrangement,
a
stable display
can usually
be obtained
by pressing
the
top
push
buttons:
AUTO, AC, INT.
When
an
adequate
trigger
signal
is
applied and the
LEVEL
control
is
correctly
set,
the unit is
triggered
as indicated
by the
illuminated
TRIG'D
light. If
the TRIG'D
light
is not
on, the
LEVEL
control is either
at
a
setting
outside the
range
of
the
trigger signal
applied
to this unit
from
the vertical
unit,
the trigger
signal
amplitude
is
inadequate,
or its
frequency
is
below the lower
frequency
limit
of
the AC
COUPLING
switch position.
If the
desired
display
is
not
obtained with
these buttons
pushed
in,
other
selections
must
be made. Refer
to the following
discussions
or the
instruction
manuals for
the
associated
oscilloscope
mainframe
and vertical
unit(s)
for more
information.
TRIGGERING
MODE
The MODE
push-button
switches
select the
mode
in
which
the
sweep is triggered.
Auto
The
AUTO MODE provides
a
triggered
display
with
the
correct setting of
the LEVEL
control
whenever
an
adequate trigger
signal
is applied
(see Trigger
Level
discussions).
The TRIG'D
light
indicates
when
the
display
is triggered.
When the trigger
repetition
rate
is outside
the
frequency
range
selected
by
the
COUPLING
switch or
the
trigger
signal
is inadequate,
the sweep
free
runs
at the
rate
indicated
by the TIME/DIV
switch
(TRIG'D
indicator
off).
An adequate trigger
signal
ends the
free-running
condition and
a
triggered
display is
presented.
The
sweep
also free
runs
at the rate
indicated
by the
TIME/DIV
switch when
the LEVEL
control
is
at a setting
outside
the
amplitude range of
the
trigger signal.
This
type of
free-
running display
is useful
when it
is desired
to
measure
only the
peak-to-peak
amplitude
of
a
signal
without
observing
the
waveshape
(such
as
bandwidth
measurements),
HF
Sync
The HF
SYNC mode
provides
a triggered
display
with
the
correct setting
of the LEVEL
control
whenever
a high
frequency,
(100
MHz or higher)
low
amplitude
signal
is
applied. This
mode is useful when
the
incoming
signal
is
too small
to
produce
stable triggering
in the
AUTO
or
NORMAL
modes. The HF
SYNC
mode
increases
trigger
sensitivity and
provides
automatic
trigger
amplifier
centering
for optimum
triggering
under
these
conditions.

Tektronix 7B10 Specifications

General

Brand	Tektronix
Model	7B10
Category	Test Equipment
Language	English