Tektronix 5103N

Operating Instructions—
51
03N
TABLE
2-3
Divisions of
display
10%
and 90%
points
Divisions
vertically
between
10%
and
90%
points
4
0.4
and
3.6
divisions 3.2
5
0.5 and 4.5
divisions 4.0
6
0.6
and 5.4
divisions 4.8
7
0.7 and 6.3
divisions 5.6
8
0.8
and 7.2
divisions 6.4
6.
Adjust the
horizontal Position
control to move the
10%
point
of the
waveform to
the second
vertical
line
of
the graticule.
For
example,
with
a
six-division
display, the
10%
point
would be 0.6
division
up
from
the start
of
the
rising portion.
Fig.
2-6.
Measuring
time difference
between
two pulses.
7.
Measure
the
horizontal
distance
between
the 10%
and
90%
points.
Be
sure
the
Variable
Seconds/Div
control is in
the
Cal
position.
8.
Multiply
the
distance
measured
in
step
7 by
the
setting
of the
Seconds/Div
switch.
EXAMPLE:
Assume
that
the
horizontal
distance
be-
tween the 10%
and
90%
points
is six
divisions
and
the
Seconds/Div
switch is
set
to
1
jus.
Using the
period
formula to
find risetime:
Risetime
_
horizontal
distance
Seconds/Div
period
(divisions)
setting
=
(6)
(Ijus)
=
0.6
microsecond
The risetime
is
0.6
microsecond.
Time
Difference
Measurements
When
used in
conjunction
with a calibrated
time-base
plug-in
unit, the
multi-trace
feature
of
the
5100-series oscil-
loscope
permits
measurement
of
time
difference
between
two or
more
separate
events. To
measure time
difference,
use
the following
procedure:
1.
Set
the
Input
Coupling
switches
of the
amplifier
channels to
either AC
or DC.
2.
Set
the Display
Mode
switch on
the time-base unit
to
either Chop
or Alt.
In
general, Chop is
more
suitable for
low-frequency
signals and
the Alt
position is
more suitable
for high-frequency
signals.
More
information on
deter-
mining the
mode is
given
under
Vertical Display
Mode in
this section.
3.
Set
the
Triggering
Mode switches
to
trigger
the dis-
play
on
Channel
1
(or
Left
Plug-in).
4.
Connect
the
reference
signal to
the
Channel 1
input
connector
and
the
comparison
signal to the
Channel 2
input
connector.
The
reference
signal
should
precede the
com-
parison
signal
in
time.
Use
coaxial
cables
or
probes
which
have
similar
time-delay
characteristics
to
connect
the
signal
to the
input
connectors.
5.
If
the
signals are
of
opposite
polarity, push the
Invert
button to
invert the Channel 2
display. (Signals may be
of
opposite
polarity due to
180°
phase
difference; if
so,
take
this
into
account in
the final calculation.)
6.
Set
the
Volts/Div switches to
produce about
four
divisions
of displayed
waveform.
7. Set
the time-base
triggering controls
for
a
stable dis-
play. Set the
Seconds/Div switch
for
a
sweep
rate
which
shows three
or more divisions
between the measurement
points,
if possible.
8.
Adjust
the vertical Position
controls
to
bring
the
measurement
points to the
center horizontal reference
line.
9.
Adjust
the
horizontal Position
control so the
Channel
1
waveform
(reference) crosses
the center
horizontal line at
a
vertical
graticule line.
10.
Measure the
horizontal distance
between the
two
measurement
points (see
Fig.
2-6).
2-9