Tektronix 2247A

Operators Familiarization
The
following
measurements
cannot
occur
when
the
SEC/DIV
VAR
control
Is
out
of
the
detent
position:
kK
SEC
31,
Ie
1/SEC
1,
ke
PHASE
4,
and
tf
SET
360°.
The
displayed
error
message
Is
“VAR
SECS/DIV
OUT
OF
DETENT.”
When
In
ALT
or
B
Horizontal
MODE,
no
C/T
measurement
Is
running,
and
the
B
Trigger
MODE
Is
not
RUNS
AFTER,
a
greater-than
symbol
(>)
will
appear
before
the
delay-time
readout.
The
readout
value
displayed
Is
the
delay
time
between
the
A
trigger
and
the
tine
aB
trigger
can
be
accepted
by
the
trigger
system.
A
question
mark
(7)
will
appear
In
front
of
the
delay
time
readout
for
delay
measurements
when
the
DELAY
time
Is
set
to
0.25
division
or
less
from
the
beginning
of
the
sweep.
{f
the
oscilloscope
in
not
triggered
when
a
gated
voltage
measurement
mode
Is
selected,
the
following
error
message
Is
displayed:
“LO
REP
RATE
- STILL TRYING.”
This
can
happen
If
the
selected
trigger
channel
has
no
trigger
signal
applied
In
NORM
Trigger
MODE
or
If
the
Trigger
LEVEL
control
is
not
set
to
obtain
a
triggered
display.
An
Improperly
triggered
display
In
either
AUTO
LEVEL
or
AUTO
Trigger
MODE
will
cause
the
measurement
readout
value
to
be
unstable,
but
no
error
message
will
be
displayed.
Measurements
in
Single
Sequence
Mode
The
following
measurements
run
continuously
during
SGL
SEQ
Trigger
MODE:
DC,
+PEAK, -PEAK,
PK-PK,
-
VOLTS
-4,
and
“7
VOLTS,
The
following
run
continuously
In
the
A
Horizontal
MODE
(with
cursors):
k-
SEC
+1,
Ie
1/SEC
31,
and
+
PHASE
>|
.
Of
the
C/T
measurements,
only
TOTALIZE
runs
continuously
In
S@L
SEQ
mode.
For
all
other
C/T
measurements,
Including
I+
SEC
4,
J+
1/SEC
+,
and
i
PHASE
-
In
ALT
or
B
Horizontal
MODES,
one
measurement
cycle
will
be
performed
and
the
result
held
in
tha
readout
display
(if
readout
Is
con-
figured
to
remain
on
in
SGL
SEQ
mode)
each
time
SGL
SEQ
Mode
is
reentered.
The
readout
and/or
cursors
are
displayed
brlefly
during
SGL
SEQ
Mode
for
making
a
photographic
record
(or
they
may
be
configured
to
remain
on—
see
the
discussion
on
Configure
Menu
in
the
“Service
Menu
Features”
part
of
this
section).
The
displayed
readout
Is
the
value
of
the
measurement
at
the
Instant
It
is
displayed.
3-34
2247A
Operators
coy
ESS
t
oe