Tektronix 2247A

Operators Familiarization
Ie PHASE
ke SET 360°
360° TRACKS A TRIG PERIOD
RISE
FALL
TRIG 10-90
(TIME)
ke
sec}
TRIG
20-80
ke 1/SEC > + SET REF
+ PHASE
(TO RISE/FALL MENU)
(TO PROP DELAY MENU) ———______» PROPOLY
(TO TIMER CONTROL MENU) SET ZERO REF
(TIMER CONTROL) AUTO RESOL
X10 RESOL
X100 RESOL
C/T TRIG TIMEOUT
(BACK TO TIME MENU)
Time Measurement Menus
In
A
Horizontal
MODE,
cursors
are
always
used
to
make
|e
SEC
—I,
l€
1/SEC
>|,
and
|
PHASE
-{
measurements.
If
one
of
these
three
measurements
Is
selected
while
in
ALT
horizontal
mode,
the
C/T
will
be
used
to
measure
the
time
difference
from
the
reference
delay
(A
sweep
start
to
B
sweep
start),
to
the
delta
delay
(A
sweep
start
to
B
delta
sweep
start);
Intensified
zones
appear
in
the
A
sweep
trace
in
ALT
horizontal
mode
to
Indicate
these
time
intervals.
The
l-
OR
DELAY
control
knob
Positions
both
delay
times
(reference
and
delta)
together,
and
the
-{
con-
trol
knob
positions
the
independent
delta
delay.
In
l&
SEC
I,
©
1/SEC
3,
and
|
PHASE
-{
measurements
made
in
ALT
Horizontal
MODE
(and
when
C/T
is
used
in
B
Horlzontal
MODE),
all
B
Trig-
ger
modes
may
be
selected,
and
couplings,
levels,
and
slopes
may
be
controlled.
B
Trigger
SOURCE
LEDs
are
turned
off
(use
the
SET
MEAS'’MT
CHANNEL
menu
to
alter
the
measurement
channels).
The
B
Trigger
light
remains
off
during
C/T
measurements.
However,
indication
of
proper
trig-
gering
is
shown
with
a
steadily
blinking
“Ct”
character
in
the
top
line
of
the
readout.
In
|
PHASE
-
in
A
Horizontal
MODE,
if
360°
TRACKS
A
TRIG
PERIOD
Is
used,
the
“Ct”
character
stays
on
continuously
(no
blinking),
the
A
Trigger
light
Indicates
when
a
proper
A
Trigger
Is
obtained.
If
a
proper
external
frequency
reference
source
Is
plugged
into
the
rear-panel
EXT
2247A Operators
fot