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28
SLOPE
Switches-Selects the slope of the signal
that triggers the sweep.
OUT-When button is released out, sweep is trig-
gered from the positive-going slope of the trigger
signal.
IN-When button is pressed in, sweep is triggered
from the negative-going slope of the trigger
signal.
29
A SOURCE
Swit ch-Determines the source of the
trigger
signal
that coupled to the input ol the A Trigger
circuit.
30
31
INT
-Permits triggering on signals that are applied
to the CH 1 OR X and CH 2 OR Y input
connec-
tors. The source of the internal signal
is
selected by
the A & B INT switch.
LINE-The
power-source waveform is the source
of the trigger signal. This trigger source is
useful
when vertical input signals are time related (multi-
ple or submultiple) to the frequency of the power-
input source
voltage.
EXT
-Permits triggering on signals applied to the
EXT INPUT connector.
A&B INT
Switch-Selects the source of the
internal
triggering signal
when
the A SOURCE switch is set to
INT.
CH
1- The signal applied to the CH 1 OR X input
connector is the source of the trigger signal.
VERT
MODE-The internal trigger source is deter-
mined by the signals selected for display by the
VERTICAL
MODE switches. See Table 2-1
for
VERT MODE trigger source.
CH
2- The signal applied to the CH 2
OR
Y input
connector is the source of the trigger signal.
A EXT COUPLING
Switch-Determines the method
used to couple external signals to the A
TRIGGER
circuit from the EXT INPUT connector.
AC-Signals above 60 Hz are capacitively coupled
to the
input
of the A Trigger circuit. Any de compo-
nents are blocked, and signals below 60 Hz are
attenuated.
Preparation for
Use-
2215A Operators
Table 2-1
VERT MODE Trigger
Source
VERT MODE
Trigger
Source
CH 1
CH 1 OR X input signal.
CH 2
CH 2 OR Y input signal.
BOTH and ADD
Algebraic sum of CH 1 OR X and
CH 2 OR Y input signals.
BOTH and CHOP
Algebraic sum of CH
1
OR and CH
2 OR Y input
signals.
BOTH and ALT
Alternates between Channel 1 and
Channel 2 on every other sweep
(i.e. CH 1
OR
X input signal triggers
the sweep that displays Channel 1,
and CH 2 OR Y input
signal
triggers
the sweep that displays
Channel
2).
32
33
34
DC-All frequency components of the signal are
coupled to the input of the A Trigger circuitry. This
position is useful for displaying low-frequency or
low-repetition-rate signals.
DC÷ 10-10-External
trigger signals are
attenu-
ated by a factor of 10. All frequency components of
the signal are coupled to the input of the A Trigger
circuit.
EXT
INPUT
Connector-Provides a means of
intro-
ducing
external
signals into the A Trigger circuit
through the A EXT COUPLING switch.
B TRIGGER
LEVEL
Control-Selects the amplitude
point on the
trigger
signals at which the sweep is trig-
gered. When fully clockwise (B RUNS AFTER DLY),
the
B
Sweep
circuit
runs immediately following the de-
lay time selected by the A SEC/DIV and the B DELAY
TIME POSITION control.
VAR HOLDOFF
Control-Provides continuous con-
trol of holdoff time
between
sweeps. Increases the
holdoff time by at least a factor of 10. This control
improves the ability to trigger on aperiodic signals
(such as complex digital waveforms).
2 -7
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