Operating Instructions; Controls, Connectors; And Indicators; Functional Check - Tektronix 7B80 Instruction Manual

Section
1— 7B80
OPERATING INSTRUCTIONS
The 7B80
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
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
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
specifi-
cations given
in
Section
2.
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
in-
stalled.
The
procedure
for checking
the unit
is
given
under
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
Instructions.
FUNCTIONAL CHECK
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
1
.
Install
the time-base
unit being checked
in
the
A
hori-
zontal
compartment
of the
mainframe.
2.
Install
an
amplifier plug-in unit
in a vertical
compart-
ment.
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
Calibrated (Pushed
in
(CAL
IN)
HOLD
OFF
MIN
(fully counter-
MAG
clockwise)
XI
(pushed
in)
4.
Turn on
the
mainframe and
allow
at least
20
minutes
warmup.
Fig. 1-1. Location of
release latch.