Operating instructions
The
71380
Time-Base
unit
operates
with
a
Tektronix
7700-,
7800-,
and
7900-series
oscilloscope
mainframes
and
a
7A-series
amplifier
unit
to
form
a complete
oscilloscope
system
.
This
section describes
the
operation
of
the
front-panel
controls
and
connectors,
provides
general
operating
information,
a
functional
check
procedure,
and
basic
applications
for
this
instrument
.
INSTALLATION
2
.
Install
an
amplifier
plug-in
unit
in
a
vertical
compart-
ment
.
The
time-base
unit
is
designed
to
operate
in
the
horizontal
plug-in
compartment
of
the
mainframe
.
This
instrument
can
also
be
installed
in
a
vertical
plug-in
compartment
to
3
.
Set
the time-base
unit controls
as
follows
:
provide
a
vertical
sweep
on
the
crt
.
However,
when
used
in
this
manner,
there
are
no
internal
triggering
or
retrace
SLOPE
(+)
blanking
provisions,
and
the
unit
may
not
meet
the
specifi-
MODE
P-P
AUTO
cations
given
in
Section
2
.
COUPLING
AC
SOURCE
INT
POSITION
Midrange
To
install
the
unit
in
a
plug-in
compartment,
push
it
in
until
TIME/DIV
1
ms
it
fits
firmly into
the
compartment
.
The
front panel
of
the
VARIABLE
Calibrated
(Pushed
in)
unit
should
be
flush
with
the
front panel
of
the
mainframe
.
(CAL
IN)
Even though
the
gain
of
the
mainframe
is
standardized,
the
HOLD
OFF
MIN
(fully
counter-
sweep
calibration
of
the
unit
should
be
checked
when
in-
clockwise)
stalled
.
The
procedure
for
checking
the
unit
is
given
under
MAG
X1
(pushed
in)
Sweep
Functions
in
the
Functional
Check
procedure
in
this
section
.
To
remove
the
unit,
pull
the
release
latch
(see
Figure
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
I
nstructions
.
The
following
procedures
are
provided
for
checking
basic
instrument
functions
.
Refer
to
the
description
of
the
con-
trols,
connectors,
and
indicators
while
performing
this
pro-
cedure
.
If
performing
the
functional
check
procedure
reveals
a
malfunction
or
possible
improper
adjustment,
first
check
the
operation
of
the
associated
plug-in
units,
then
re-
fer
to
the
instruction
manual
for
maintenance
and
adjust-
ment
procedures
.
Setup
Procedure
FUNCTIONAL
CHECK
OPERATING
INSTRUCTIONS
warmup
.
1
.
Install
the time-base
unit
being
checked
in
the
A
hori-
zontal
compartment
of
the
mainframe
.
Fig
.
1-1
.
Location
of
release
latch
.
Section
1-71380
4
.
Turn on
the
mainframe
and
allow
at
least
20 minutes
RELEASE
LATCH
1958-3