Tektronix 7B10 User Manual

External
The EXT
position
connects the
signal
from the
EXT
TRIG
IN
connector
to
the
trigger
circuit.
The
external
signal
must
be time-related
to the
displayed
waveform
for
a
stable display.
An external
trigger
signal
can
be
used
to
provide
a
triggered
display
when
the
internal
signal
is
either
too low in
amplitude
for
correct
triggering
or
contains signal
components
on which
triggering
is
not
desired.
It is
also
useful when
signal
tracing
in
amplifiers,
phase-shift
networks,
wave-shaping
circuits,
etc. The signal from
a single
point in
the
circuit
can
be
connected
to the EXT
TRIG IN
connector
through
a probe
or cable. The
sweep
is then triggered
by the
same
signal
at all times
and allows
amplitude,
time
relationship,
or
waveshape
changes of
signals
at various
points in
the
circuit
to be examined
without
resetting
the
TRIGGERING
controls.
The IN
1 Mn/OUT
50
Q
pushbutton
provides
a
convenient
means of
selecting
external-trigger
input
impedance. Pushing
the button
in
sets the
amplifier
input
impedance
to 1 MQ and
the OUT
position
provides
50 Q
input impedance.
Operating
Instructions—
7B10
Operators
HORIZONTAL
SWEEP
RATES
The TIME/DIV
switch
provides
calibrated
sweep
rates
from .2
seconds/division
to 2
nanosecond/division
in
a
1-2-5
sequence. The
VARIABLE
TIME/DIV
control
must
be in the
calibrated
position
and the
MAG
switch
set to
XI
to obtain the
sweep
rate
indicated
by
the TIME/DIV
switch.
However,
the
mainframe
crt
readout
will
display
the
appropriate
sweep
rate.
The VARIABLE
TIME/DIV
control
includes
a
two-position
switch
to determine
if the
sweep
rate is
calibrated,
or
uncalibrated.
When the
VARIABLE
control is
pressed
in,
it
is
inoperative
and the
sweep
rate is
calibrated.
When
pressed and
released
outward,
the
VARIABLE
control
is
activated
for
uncalibrated
sweep
rates,
to at
least
the
sweep rate
of
the next
slower
position.
A calibrated
sweep rate
can
be
obtained
in any
position
of
the VARIABLE
control
by
pressing
in the
VARIABLE
control. This
feature is
particularly
useful
when
a
specific
uncalibrated
sweep rate
has
been
obtained
and
it is
desired
to switch
between
calibrated
and
uncalibrated
displays.
TRIGGERING
SLOPE
TIME
MEASUREMENTS
The
TRIGGERING
SLOPE
switch
(concentric
with
the
TRIGGERING
LEVEL
control)
determines
whether
the
trigger
circuit responds
on the
positive- or
negative-going
portion of the
trigger
signal.
When the
SLOPE
switch
is
in
the
(+)
(positive-going)
position,
display
starts
on
the
positive-going
portion of
the
waveform
(see Figure
2-2).
When
several cycles of
a signal
appear
on the
display
the
setting of the
SLOPE
switch
is often
unimportant.
However, if only
a certain
portion
of
a cycle
is
to be
displayed,
correct
setting
of the
SLOPE
switch
is
important
to provide
a display that
starts
on the
desired
slope
of the input
signal.
TRIGGERING
LEVEL
The TRIGGERING
LEVEL
control
determines
the
voltage
level on the
trigger
signal
at which
the
sweep
is
triggered.
When
the LEVEL
control is
set in
the
+
region,
the trigger
circuit
responds
at a more
positive
point
on
the trigger
signal.
When
the
LEVEL
control
is
set in
the
-
region,
the
trigger
circuit
responds
at
a more
negative
point on
the trigger
signal.
Figure
2-2
illustrates
this
effect
with
different
settings
of the
SLOPE
switch.
To
set
the
LEVEL
control,
first
select
the
TRIGGERING
MODE,
COUPLING,
SOURCE, and
SLOPE.
Then
set the
LEVEL
control
fully
counterclockwise
and
rotate
it
clockwise until
the
display
starts
at the
desired
point.
In
the
HF SYNC
mode,
the trigger
LEVEL
control
varies
the
sensitivity
of the
Trigger
Generator.
The
LEVEL
control is
set to
provide
a stable
display.
When
making
time
measurements
from
the
graticule,
the
area
between the
second
and
tenth
vertical
lines
of
the
graticule
provides
the
most linear
time
measurements
(see Fig. 2-3).
Position
the
start
of the
timing
area
to the
second
vertical line
and
adjust
the TIME/DIV
switch
so
the
end of the timing
area
falls
between
the
second
and
tenth
vertical
lines.
SECOND-VERTICAL
TENTH-VERTICAL
LINE
line
I
I
'
;
^
1
H
1
•
i
I
H
time
measurement
AREA
C
1752-06
Fig. 2-3.
Area
of graticule
used
for
most
accurate
time
measurements.
2-7

Tektronix 7B10 Specifications

General

Brand	Tektronix
Model	7B10
Category	Test Equipment
Language	English