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(30) Trigger MODE switch
(31) Trigger COUPLING switch
(32) Trigger SOURCE switch
To select the sweep triggering mode.
AUTO position selects free-running sweep where
a baseline is displayed in the absense of a
signal. This condition automatically reverts
to triggered sweep when a trigger signal of 25
Hz
or higher is received and other trigger
controls are properly set.
NORM position produces sweep only when a trigger
signal is received and other controls are pro
perly set. No trace is visible if any trigger
requirement is missing. This mode must be used
when the signal frequency is 25
Hz
or lower.
TV-V position is used for observing a composite
video signal at the frame rate.
TV-H position is used for observing a composite
video signal at the line rate.
To select the frequency characteristics of the
trigger-circuit coupling.
AC position inserts a large capacitor in the
trigger-coupling chain to remove and DC com
ponent from the trigger signal.
HF
REJ
position inserts a filter in the trigger
coupling chain that removes signal components
higher than 4 kHz. Use this position to elimin
ate high-frequency noise.
LF
REJ
position inserts a filter that removes
signal components lower in frequency than 4 kHz.
Use this position to eliminate low-frequency
noise or undesired trigger signals.
DC position passes the trigger signal without
modification. Use this setting when triggering
from a very low-frequency signal or a DC level.
To conveniently select the trigger source.
CHI position selects the channel I signal as
the trigger source.
CH2 position selects the channel 2 signal as
the trigger source.
LINE position selects a trigger derived from the
AC power line. This permits the scope to sta
bilize display line-related components of a signal
even if they are very small compared to other
components of the signaL
EXT position selects the signal applied to the
EXT TRIG IN connector.
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