http://web.njit.edu/~ransom/Tektronix2235.html 9/9/2007 12:44 PM
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 dc components are blocked, and signals below 60 Hz are attenuated.
DC-All 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 1/10th-External trigger signals are attenuated by a factor of 10. All components
of the signal are coupled to the input of the A Trigger circuit.
(32)EXT INPUT Connector-Provides a means of introducing external signals -into the A
Trigger circuit through the A EXT COUPLING switch.
(33) TRIGGER LEVEL Control-Selects the amplitude point on the trigger signals at
which the sweep is triggered. When fully clockwise (B RUNS AFTER DLY), the 8 Sweep
circuit runs immediately following the delay time selected by the A SEC/DIV switch
and the B DELAY TIME POSITION control.
(34) VAR HOLDOFF Control-Provides continuous control 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).
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