Tektronix 2247A

Operators Familiarization
label
Is
selected
(underlined).
If
the
trial
measurement
results
do
not
allow
X10
RESOL
mode
elther,
“NOT
POSSIBLE
—>
"
Is
displayed
by
the
X10
RESOL
label
for
one
second,
the
mode
Is
automatically
switched
to
AUTO
RESOL,
and
the
measurement
proceeds
in
auto
resolution
mode.
If
X10
RESOL
mode
Is
possible,
the
measurement
will
proceed
as
described
above
for
X10
RESOL
mode.
If
X100
RESOL
mode
Is
possible,
the
measurement
time
interval
required
to
get
two
more
fully
resolved
digits
is
calculated.
If
this
time
Is
greater
than
5
seconds,
the
message
“MEASMT
TIME
XXXXs”
fs
displayed
to
the
left
of
the
X100
RESOL
label,
where
XXXX
Is
this
measurement
time
interval
in
seconds.
If
this
time
interval
Is
greater
than
9999
seconds,
the
message
“MEASMT
TIME
>9999s"
Is
displayed
instead.
The
measurement
then
proceeds
using
this
new
measurement
time
Interval.
C/T
TRIG
TIMEOUT—This
Is
the
last
Item
In
the
C/T
control
menu.
Each
time
the
menu
button
for
this
item
Is
pressed,
the
Item
Is
either
selected
(underlined)
or
deselected
(not
underlined).
When
selected
(the
default setting
when
a
C/T
measurement
Is
first
called
up)
the
C/T
will
wait
for
approximately
400
milliseconds
to
receive
a
start
trig-
ger,
or,
if
a
start
trigger
has
been
received,
the
C/T
will
wait
that
long
for
a
stop
trigger
(C/T
measurements
start
and
stop
synchronously
with
the
trigger
signal
being
measured).
If
the
C/T
times
out
while
waiting
for
a
trigger
edge,
an
appropriate
error
message
Is
displayed
(see
earlier
section
on
C/T
error
messages).
To
measure
a
signal
with
a
duration
longer
than
400
milliseconds,
C/T
TRIG
TIMEOUT
can
be
toggled
off.
This
allows
signals
to
be
measured
that
have
durations
up
to
100
seconds
(actually,
99.999999
seconds),
Conditions
for
Cursors
Display
The
following
information
Is
an
ald
In
understanding
the
order
in
which
the
menu
measurement
cursors
are
displayed,
Measurement Cursors
One
or
two
measurement
cursors
may
be
displayed
if
any
one
of
the
fol-
lowing
conditions
Is
met:
VOLTMETER
CH1/CH2—TRACK
MEASMT
Is
underlined
and
measurement
source
channel
Is
on
and
the
VOLTS/DIV
VAR
control
In
detent.
CURSOR
VOLTS—Measurement
source
channel
must
be
on
and
VOLTS/DIV
VAR
control
in
detent.
3-30
2247A
Operators