Operating instructions
INSTALLATION
The
time-base
unit
operates
in
the
horizontal
plug-in
compartment
of
the
mainframe
.
When
used
for
single
sweep
acquisition
with
a
Tektronix
7000-series
digitizing
oscilloscope
(7854)
the
71387
must
be
installed
in
the
B
horizontal
compartment
of
the
mainframe
.
This
instrument
can
also
be
installed
in a
vertical
plug-in
compartment
to
provide
a
vertical
sweep
on
the
crt
.
However,
when
used
in
this
manner,
there
are
no
internal
triggering
or retrace
blanking
provisions,
and
the
unit
may
not
meet
the
specifications
given
in
Section
2,
Specification
.
To
install
the
unit
in
a plug-in
compartment,
push
it
in
until
it
fits
firmly
into
the
compartment
.
The
front
panel
of the unit
should be
flush
with
the
front
panel
of
the
mainframe
.
Even
though
the
gain
of
the
mainframe
is
standardized,
the
sweep
calibration
of
the
unit
should
be
checked
when
installed
.
The
procedure
for
checking
the
unit
is
given
under
Sweep
Functions
in
the
Functional
Check
procedure
in
this
section
.
To
remove
the
unit,
first
turn
the
power
off,
then
pull
the
release
latch
(see
Fig
.
1
-1)
to
disengage
the
unit
from
the
mainframe,
and
pull
it
out
of
the
plug-in
compartment
.
CONTROLS,
CONNECTORS,
AND
INDICATORS
All
controls,
connectors,
and
indicators
required
for
the
operation
of
the
time-base
unit
are
located
on
the
front
panel
.
Figure 1-2
shows
and
provides
a
brief
description
of
all
front-panel
controls,
connectors,
and
indicators
.
More
detailed
information
is
given
in
the
General
Operating
Instructions
.
FUNCTIONAL
CHECK
The
following
procedures
are
provided
for
checking
basic
instrument
functions
.
Refer
to
the
description
of
the
controls,
connectors,
and
indicators
while
performing
this
procedure
.
If
performing
the
functional
check
procedure
reveals
a
malfunction
or
possible
improper
adjustment,
first
check
the
operation
of
the
associated
plug-in
units,
then
refer
to
the
instruction
manual
for
maintenance
and
adjustment
procedures
.
The
71387
Time-Base
unit
operates
with
a
Tektronix
7700-,
7800-,
or
7900-series
oscilloscope
mainframeand
a
7A-
series
amplifier
unit
to
form
a
complete
oscilloscope
system
.
This
section
describesthe operation
of
the
front-panel
controls
and
connectors,
provides
general
operating
information,
a
functional
check
procedure,
and
basic
applications
for
this
instrument
.
SETUP
PROCEDURE
1
.
Install
the
time-base
unit
in
the
A
horizontal
compartment
of
the
mainframe
.
2
.
Install
an
amplifier plug-in unit
in
a
vertical
compartment
.
3
.
Set
the
time-base
unit
controls
as
follows
:
SLOPE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(+)
MODE
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
P-P
AUTO
COUPLING
.
.
.
. .
.
. . .
.
. . . . . . . . . . .
.
. . .
.
. . .
.
. . .
.
AC
SOURCE
.
.
.
.
. . . . . . .
.
. . . . . . . . . . . . . . .
.
. . .
.
.
. .
.
INT
POSITION
. . . . . . . . . . . . . .
.
. . .
.
. . .
.
.
.
. . . .
Midrange
.TIME/DIV
.
. . .
.
. . .
.
. . .
.
. . .
.
.
.
. . .
.
.
.
. . .
.
. . .
.
1
ms
VARIABLE
(CAL
IN)
.
.
.
.
.
.
Calibrated
(Pushed
in)
HOLD
OFF
. . .
.
. . .
.
. .
MIN
(fully
counterclockwise)
MAG
.
.
. . . . . .
.
. . . . . . . . . . . . . . . . . .
X1
(pushed
in)
Section
1--71387
Figure
1-1
.
Location of
release
latch
.