CH2 (in); The signal connected to the CH2 INPUT con
nector is the trigger signal.
EXT (External Trigger) (CHI and CH2 push buttons
out): Signal connected to the EXT TRIG INPUT connector
is the trigger signal.
27. Slope-Push button switch selects either the positive
going or negative going slope of the trigger signal.
+ (out): Sweep triggers on the positive-going portion of
the trigger signal.
- (ini: Sweep triggers on the negative-going portion of
the trigger signal.
28. Coupling -Push button switch selects method of
coupling the signal to the trigger generator circuit.
AC (out): Rejects dc and attenuates signals below about
60 Hz. Accepts signals from about 60 Hz to 5 MHz.
OC (in): Provides direct coupling for signals within the
vertical bandpass (dc to about 5 MHz).
29. TRIGGER LEVEL—Selects the amplitude point on
the triggering signal at which sweep is triggered. It is usually
adjusted after Trigger Source, Coupling and Slope have
been selected.
30. T T L -ln conjunction with TTL positions of the
CH1/CH2 VOLTS/DIV switch, presets the trigger for a
stable display from an input TTL source. Trigger Coupling
must be in DC and Mode switch in the NORM position.
31. Trigger Mode-Push-button switch that determines
the operating mode of the trigger circuit.
AUTO (Automatic) (in): Sweep is triggered when a
signal with sufficient amplitude and a repetition rate of at
least 200 Hz (to 5 MHz) is applied to the vertical system.
In the absence of an adequate signal, sweep free-runs to
produce a reference display trace.
NORM (Normal) (out): Sweep is initialized if the follow
ing circuit conditions are met: TRIGGER LEVEL set cor
rectly .sufficient signal amplitude applied to vertical system;
input signal frequency within the vertical bandpass limits
when Coupling is in the DC position, or signal frequency is
between 60 Hz to 5 MHz in AC Coupling mode. In the ab
sence of an adequate trigger signal or when trigger controls
are misadjusted, there is no sweep or trace.
305 Operators
13
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