Tektronix 7B10 User Manual

Operating
Instructions—
7B
10
Operators
Fig.
2-5.
Measuring
the period
and
determining
the
frequency
of a displayed
waveform.
5.
Set the vertical
deflection
factor
and
position
control
for
about
a 5-division
display,
vertically
centered
on
the
graticule.
6. Set the TIME/DIV
switch
and
POSITION
controls
for
a
complete
cycle
displayed
within
the
center
8
graticule
divisions
as
shown in
Figure
2-5.
7. Measure
the
horizontal
distance
in
divisions
over
1
complete cycle
of the
displayed
waveform.
Using the
formula:
1
Frequency
=
—
\
—
period
Substituting
values:
1
Frequency
=
—
=
1.43
kilohertz
0.7 ms
RISE-TIME
AND
FALL-TIME
MEASUREMENTS
Perform
the following
procedure
to
measure
the
rise
time
and fall time
of
a displayed
waveform:
1. Install the
time-base
unit
in
a
mainframe
horizontal
compartment
(either
A or
B
horizontal
in
a four-
compartment
mainframe).
2.
Connect the
signal
to be
measured
to the
vertical
unit
input.
3.
Set the mainframe
horizontal-
and
vertical-mode
switches
to display
the time
base and
the
vertical
unit.
(Check that
the time
base
VARIABLE
(CAL
IN)
control
is
pushed in and
the
HOLD
OFF
control
is
in
the
MIN
position.)
4. Set the
TRIGGERING
switches
and
LEVEL
control
for
a
stable display
(see
General
Operating
Information
for
selecting
proper triggering).
5.
Set the vertical
deflection
factor
and
position
controls
for
a
vertically-centered
display
with
an
exact
number
of
divisions of
amplitude.
8.
Multiply the
horizontal
distance
measured
in
Step
7
by
the TIME/DIV
switch
setting.
(Divide
the
answer
by
10 if
sweep
magnification
is
used.)
Example:
Assume
that
the
horizontal
distance
over
1
complete
cycle is
7 divisions,
and the
TIME/DIV
switch
setting
is .1
ms
(see Fig. 2-5).
Using
the formula:
Horizontal
TIME/DIV
Period
=
distance
x
setting
Magnification
Substituting
values:
Period
=
-
^
=
0.7 millisecond
1
9.
Determine
the
frequency
of
the
displayed
waveform
obtained
in
steps 1
through
8
by taking
the
reciprocal
of
the
period
of
1 cycle.
Example:
Assume
that
the
period
of
the
displayed
waveform
is 0.7
millisecond.
6.
Set the TIME/DIV
switch
and
POSITION
control
to
display
the
rising
or falling
portion
of the
waveform
within
the center
8
graticule
divisions
as shown
in
Figure
2-6
(see General
Operating
Information
in
this
section
for
discussion of
timing
measurement
accuracy).
7. Determine
rise
time or
fall
time
by
measuring
the
horizontal
distance
in
divisions
between
the
point
on
the
rising or
falling
portion
of
the
waveform
that
is
10% and
the point
that is
90%
of the
total
display
amplitude
(see
Fig. 2-6).
NOTE
The
left
edge
of the
oscilloscope
graticule
is
scribed
with
0, 10,
90,
and
100%
lines
for
convenience
when
measuring
rise
time
or fall
time.
To
use this
feature,
adjust
the
vertical
deflection
factor
and
position
controls
to
fit
the display
between
the
0
and
100%
graticule
lines.
Then
measure
the
horizontal
distance
between
the
points
where
the
waveform
crosses the
10%, and
90%,
graticule
lines.
8. Multiply
the
horizontal
distance
measured
in
step
7
by
the
TIME/DIV
switch
setting.
(Divide
the
answer
by 10
if
sweep
magnification
is
used.)
@
2-9

Tektronix 7B10 Specifications

General

Brand	Tektronix
Model	7B10
Category	Test Equipment
Language	English