TYPE 7B51
SECTION
2
OPERA
TING
INSTRUCTIONS
Change
information,
if
any,
affecting
this section
will
be
found
at
the rear
of
the manual.
General
The Type 7B51 delaying sweep plug-in unit operates
with a Tektronix 7000-series indicator oscilloscope and a
7A-series vertical plug-in
unit
to
form a complete oscillo-
scope system. To use
the
Type
7B51 effectively,. its
op~ra
tion and capabilities should be known. ThiS section
describes
the
operation
of
the
front-panel controls, gives
first-time and general operating information and lists some
basic applications for
this
instrument.
Installation
The Type 7B51
is
designed
to
operate
in
the
horizontal
plug-in
compartments
of
Tektronix 7000-series oscillo-
scopes. The Type 7B51 can also be installed
in
a vertical
plug-in
compartment
to
provide a sweep
that
runs vertically
on
the
CRT. However, when used
in
this manner, there is
no retrace blanking
or
internal triggering provision and
the
unit may not meet
the
specifications given
in
Section 1.
The instructions
in
this manual are written
for
use
of
the
Type 7B51
in
a horizontal plug-in
compartment
of
the
oscilloscope.
When
the
Type 7B51
is
used with an oscilloscope which
has
two
horizontal plug-in compartments, install this unit
in
the A (DELAYING TIME BASE)
compartment.
Then,
if
a
delayed-sweep unit
is
installed
in
the
B (right) compart-
ment, delayed-sweep operation
is
available. The
Type
7B51
will operate properly
in
the
B
compartment
for all horizon-
tal modes
of
operation
except
delaying sweep.
To install
the
Type
7B51 into a plug-in
compartment,
push it
in
until it fits firmly into
the
indicator plug-in
compartment. To remove, pull
the
release latch (see Fig.
2-1)
to
disengage
the
unit
from
the
indicator and pull it
out
of
the
plug-in
compartment.
Even though
the
horizontal
gain
of
the
indicator oscilloscope
is
standardized
to
minimize adjustment when inserting plug-in units,
the
sweep calibration of
the
Type 7B51 should be checked
when it
is
inserted into
the
indicator
to
verify measurement
accuracy. The procedure for checking
the
unit
is
given
under Sweep Calibration Check
in
this section.
FRONT~ANELCONTROLSANDCONNECTORS
General
All
controls required for
the
operation
of
the
Type 7851
are located
on
the
front
panel
of
the
unit
(see Fig. 2-2).
To
make full use
of
the
capabilities
of
this instrument,
the
II
B
TflIGGERABl£
AfffR
IJ£IAY
DELAY
TIME
MUlT
TfkTRONI)(®
7851
Fig. 2-1.
Location
of
release
latch.
operator should be familiar with
the
function and use of
each of these controls. A brief description
of
the
front-
panel controls and connector
is
given here. More detailed
information
is
given under General Operating Information.
Triggering Controls
LEVEL/SLOPE
TRIG'D
Selects
the
amplitude
point
and
slope
of
trigger signal
on
which
the
sweep
is
triggered. When
the
indica-
tor
line on
the
outer
ring
is
to
the
left
of
center,
the
sweep
is
triggered
on
the
positive-going slope
of
the
trigger signal, as shown by
the
positive-going waveform. To
the
right of center,
the
sweep
is
trig-
gered on
the
negative-going slope
of
the
trigger signal as shown by
the
negative-going waveform.
Light indicates
that
the
sweep
is
triggered and will produce a display
with correct setting
of
the
POSI-
TION control and
the
controls
on
the
associated vertical unit and indi-
cator oscilloscope.
2-1
