Section 2 Operating Instructions; Operators Checkout; Setup Procedure; Sweep Functions - Tektronix 7B10 Instruction Manual

Section
2—
7B10
Operators
OPERATING INSTRUCTIONS
The 7B10
Time-Base
unit
operates with
a Tektronix
7100, 7700, 7800,
or 7900-series
oscilloscope
mainframe 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
detailed operating
information, an
operators checkout
procedure, and
basic
applications
for this instrument.
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
2-1 provides
a brief description
of
all
front-
panel
controls, connectors,
and
indicators.
More
detailed
information
is
given
in
the
Detailed Operating
Information.
OPERATORS CHECKOUT
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 operators checkout
procedure
reveals
a
malfunction
or possible
maladjustment,
first
check
the
operation
of the
associated plug-in
units,
then
refer to
the
instruction
manual
for
maintenance and adjustment
procedures.
SETUP PROCEDURE
1. Install
the time-base
unit
being checked
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
auto
COUPLING
AC
SOURCE
INT
POSITION
Midrange
TIME/DIV
1
ms
VARIABLE
(CAL
IN)
Calibrated
(Pushed
in)
HOLD
OFF
min
(fully
counterclockwise)
mag
XI (pushed
in)
EXT
TRIG
IN
OUT
50
O
4.
Turn on
the
mainframe and
allow
at least
20
minutes
warmup.
5.
Set the mainframe
vertical
and
horizontal
modes
to
display the
plug-in units used and
adjust the
intensity
and
focus
for a well-defined
display.
See
the oscilloscope
mainframe and
amplifier unit instruction manuals
for
detailed
operating
instructions.
SWEEP
FUNCTIONS
Normal
Sweep
Perform
the following
procedure
to
obtain a normal
sweep
and
to
demonstrate
the function
of the related
controls:
1
.
Perform the preceding Setup
Procedure.
2.
Connect
a 0.4-volt,
1
-kilohertz
signal
from
the
mainframe
calibrator to the
amplifier unit
input.
3.
Set the
amplifier unit deflection factor
for
4
divisions
of display.
4.
Adjust the
LEVEL
control
for a stable display,
5.
Turn
the
POSITION
control
and
note
that the trace
moves
horizontally.
6.
Turn
the
FINE
control
and
note
that the
display
can be
precisely positioned
horizontally.
7.
Check
the display
for
one complete
cycle per
division.
If
necessary,
adjust the front-panel
SWP
CAL
screwdriver
adjustment
for
one complete
cycle per
division over the
center
8 graticule divisions. Be sure
that the timing
of the
mainframe
calibrator signal
is
accurate
to
within 0
25%
(+20°
to +
30°
C).
8.
Press
to
release the
VARIABLE
(CAL
IN) control.
Turn
the
VARIABLE
(CAL
IN)
control
fully counterclockwise
and
note
that the displayed sweep
rate changes
to at
least
the next
slower
TIME/DIV
switch
setting
(i.e.,
2
milliseconds/division). Press
the
VARIABLE
(CAL
IN)
knob
in to
the
calibrated position.
Magnified
Sweep
Perform the
following procedure
to
obtain
a
XI
0
magnified
display
and
to
demonstrate
the function
of
the
related controls:
1.
Obtain
a
one
cycle per division display as
described
in
the preceding Normal Sweep
procedure.
2.
Press
to
release the
MAG
button
(XI
0).
Note
that the
unmagnified
display within the center
division of the
graticule
is
magnified
to
about 10
divisions.
3.
Press the
MAG
button
(XI
).
2-1