Tektronix 2247A

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Operators Familiarization
COUNTER/TIMER TIMEBASE INPUT connector, the “Ct” character will
have the “ET” character above it.
\- SEC | —Press to measure the equivalent time difference between
the two vertical cursors displayed In the A Horizontal MODE or the two
tlme delays In ALT or B Horizontal mode. The position of both cursors
or both delays Is controlled by the ~ OR DELAY control; the position
of the delta cursor or the delta delay is controlled by the -4 control.
The measured time difference between the two cursors or delays Is
displayed in the crt readout. When Horizontal MODE Is ALT or B, the
C/T Is used to measure the time interval between the two delays (cur-
sors can be used In B Horizontal MODE). When the C/T |s used, all B
trigger modes are available (the selected mode Is the same for both B
delay and B delta triggers) .
\f the Horizontal MODE Is X-Y, pressing the kK- SEC ~| button causes
the
message
“USE
A
ALT
OR
B
MODE”
to
be
displayed
for
two
seconds.
Changing
the
Horizontal
MODE
to
X-Y
after
k-
SEC
+1
has
been activated will cancel the measurement with no message.
k- 1/SEC | —Measures the time difference in frequency units (hertz)
between the cursor positions In A Horizontal MODE or between the
delay-time setting and the delta-delay time setting In elther ALT or B
Horizontal MODE. When Horizontal MODE ts ALT or B, the C/T
measures
the
delta
time
interval
and
displays
the
equivalent
frequency
(cursors
can
be
used
in
B
Horizontal
MODE).
When
the
C/T
Is
used,
all
B
Trigger
modes
are
available,
as
in
|~
SEC
>|.
Measurement
points
are
the
left
ends
of
the
two
Intensified
zones
in
ALT
Horizontal
MODE.
l-
PHASE-4
—Calls
up
a
lower
level
menu
for
phase
measurement
operation.
Cursor
positioning
for
delay
and
delta
time setting
are
identical
to
the
l-
SEC
>|
mode.
The
value
displayed
for
the
phase-measurement
readout
has
unlts
of
degrees
and
Is
calculated
by
the
following
formula:
(tlme difference)
Phase (In degrees) (reference time)
360
When
selecting
the
}-
PHASE
-|
measurement,
a
second
menu
|s
dis-
played
to
permit
the
user
to
set
the
360
degree
phase
measurement
reference,
2247A
Operators
3-17