Tektronix 2247A

Operators Familiarization
SET
ZERO
REF
is
a
measurement
modifier
that
toggles
on
(underlined)
or off
whenever
this
menu
Item
button
Is
pushed.
When
turned
on,
an
initlal
propagation
measurement
Is
made
by
the
C/T,
and
saved
as
a
zero
reference.
Thereafter
(until
toggled
off),
all
propagation
delay
measurements
will
have
this
zero
reference
value
subtracted
from
them.
This
Is
useful
for
zeroing
out
delay
mismatches
between
channels
and
probes.
NOTE
For
PROPDLY
measurement,
if
the
START
measurement
channel
Is
the
same
as
the
A
Trigger
channel,
than
A
Trig-
ger
level
is
automatically
adjusted
to
try
to
guarantee
that
the
measurement
will
trigger
properly,
as
follows:
'f
A
Trigger
SLOPE
is
the
same
as
the
measure-
ment's
B
START
slope,
the
A
Trigger
level
is
set
near
the
B
START
trigger
level.
if
A
Trigger
SLOPE
is
~_
and
8
START
SLOPE
is
~~,
or
if
A
Trigger
SLOPE
is
—
and
B
START
SLOPE
is
~_,
A
Trigger
level
is
set
near
the
50%
level,
(TO
TIMER
CONTROL
MENU)—selects
a
menu
that
allows
resolution
magnifiers
to
be
selected
for
the
C/T-based
versions
of
the
time
measurements.
Only
one
of
the
three
resolution
magnifiers
may
be
selected
at
a
time.
The
selected
resolution
magnifler
gets
under-
lined.
See
the
C/T
Control!
Menu
discussion
for
a
description
of
resolution
magnifier
operation.
(TIMER CONTROL) AUTO RESOL
X10 RESOL
100 RESOL
C/T TRIG TIMEOUT
(BACK TO TIME MENU)
Timer Control menu
Each
press
of
the
C/T
TRIG
TIMEOUT
Item
button
toggles
this
function
on
and
off.
Timeout
mode
gets
underlined
when
it
is
toggled
on.
Toggling
timeout
mode
in
this
menu
also
changes
It
in
the
(C/T
CONTROL)
menu.
The
(TIMER
CONTROL)
menu
stays
up,
unless
{BACK
TO
TIME
MENU)
Is
selected.
See
the
C/T
Control
Menu
discussion
for
the
description
of
thls
function.
3-24
2247A Operators
g
EG
Eg