Tektronix 2247A

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Controls, Connectors, and Indicators
FREQ RATIO
A source: TRIG SELECT: A SLOPE: T
B source 1: TRIG SELECT: B chx SLOPE: Tt
B source 2: TRIG SELECT: B chy SLOPE: T
Chx Is the numerator channel, and chy Is the denominator
channel (CH 1, CH 2, CH 3, CH 4, or ADD may be selected
for either channel). tT is an up-arrow if positive trigger slope
or a down-arrow if negative trigger slope.
Ie SEC Ie W/SEC t- PHASE >A
(when run in ALT or B horizontal mode)
A source: TRIG SELECT: A SLOPE: T
B source 1: TRIG SELECT: B SLOPE: T
B source 2: TRIG SELECT: 8 A SLOPE: T
PROP DELAY
A source; TRIG SELECT: A SLOPE: fT
B source 1: TRIG SELECT: B START SLOPE: t
B source 2: TRIG SELECT: B STOP SLOPE: Tt
SLOPE Button—Selects the slope (positive- or negative-going) of
the
trigger
source
signal
that
triggers
either
the
A
sweep,
the
B
sweep,
or
the
C/T.
(Button
lit
=
positive-going;
button
not
lit
=
negatlve-going.)
HOLDOFF
Control—Varies
holdoff time
between
the
end
of
one
A
sweep
and
the
start
of
the
next
A
sweep.
The
HOLDOFF
control
can
Increase
the
minimum
holdoff
time
by
at
least
10
times.
Adjusting
this
control
can
improve
triggering
stability
of
aperiodic
signals
(l.e.,
complex
digital
waveforms)
.
LEVEL
Control—Sets
the
amplitude
level
on
the
trigger
signal
at
which
either
the
A
sweep,
the
B
sweep,
or
the
C/T
Is
triggered.
When
a
sweep
Is
triggered,
the
TRIG'D
indicator
Is
lit.
During
C/T
measure-
ments,
the
TRIG'D
Indicator
Is
unlit
for
B
trigger.
2247A
Operators
2-13