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Tektronix 475A - Risetime

Tektronix 475A
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Use
the
DELAY
TIME
POSITION
dial
to
move
the
intensified
zone
to
the
CH
1
pulse.
Set
the
HORIZ
DISPLAY
switch
to
B
DLY’D.
Readjust
the
DELAY
TIME
POSITION
dial
to
move
the
CH
1
pulse
or
rising
portion
to
some
vertical
reference
line
(see
Fig.
27B).
Note
the
DELAY
TIME
POSITION
dial
setting.
Use
the
DELAY
TIME
POSITION
dial
to
move
the
CH
2
pulse
or
rising
portion
to
the
same
reference
line.
Again
note
the
DELAY
TIME
POSITION
dial
setting.
Substitute
the
DELAY
TIME
POSITION
dia!
settings
in
the
time
difference
formula
to
find
the
time
difference.
EXAMPLE:
The
A
TIME/DIV
switch
is
set
to
50
us
and
the
B
TIME/DIV
switch
is
set
to
2
us.
Use
the
DELAY
TIME
POSITION
dial
to
move
the
CH
1
pulse
to
the
reference
line.
The
DELAY
TIME
POSITION
dial
setting
is
2.60.
Use
the
DELAY
TIME
POSITION
dial
to
move
the
CH
2
pulse
to
the
reference
line.
The
DELAY
TIME
POSITION
dial
setting
is
7.10.
To
find
the
time
difference
use
the
formula:
Time
second
first
delay
time
A
=
dial
=
dial
X
(A
TIME/DIV
difference
å
setting
setting
setting)
Substituting
the
given
values:
Time
Difference
=
(7.10
~
2.60)
X
50
us
=
225
us
RISETIME
(BASIC
475A)
Risetime
measurements
use
the
same
methods
as
time-
duration
measurements,
except
the
measurements
are
made
between
the
10%
and
90%
points
of
the
waveform.
Falitime
is
measured
between
the
90%
and
10%
points
on
the
trailing
edge
of
the
waveform.
Use
a
sweep
speed
setting
that
displays
several
cycles
or
events
(if
possible)
and
be
sure
the
VAR
TIME/DIV
control
is
in
the
calibrated
detent.
Set
the
VOLTS/DIV
switch
and
the
VAR
control
(or
signal
amplitude)
for
exactly
a
five-division
display.
Set
vertical
positioning
so
the
display
bottom
touches
the
0%
graticule
line
and
the
display
top
touches
the
100%
graticule
line
(see
Fig.
28).
Set
the
A
TIME/DIV
switch
for
a
single-event
display
with
the
risetime
spread
horizontally
as
much
as
possible.
Horizontally
position
the
display
so
the
10%
point
of
the
waveform
intersects
the
second
vertical
graticule
line
(see
Fig.
28).
Set the
B
TIME/DIV
switch
to
the
fastest
sweep
speed
that
provides
a
usable
(visible)
intensified
zone.
Use
the
DELAY
TIME
POSITION
dial
to
move
the
start
of
the
intensified
zone
(left-hand
edge)
to
just
touch
the
intersection
of
the
signal
and
the
10%
graticule
line
(see
52
475A/DM44
Operators
=
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