External Trigger; Marker 1 Z-Blank (Pen Lift) X-Drive Outputs - HP 3326A Operating And Reference Manual

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External Trigger
EXTERNAL TRIGGER
EXT TRlG IN
From the preset state, EXT TRlG IN (EXTernal TRlGger INput) is used to trigger single
frequency sweeps. Triggered operation is initiated by a negative edge transition of a
TTL level signal after the sweep is reset. Triggers received during a sweep reset are
ignored. The shortest delay between a trigger and sweep start is when the sweep is
reset prior to the trigger. The trigger functions are extended through the use of HP-IB
commands described in "Triggered Sweeps" and "Modifying Parameters" in Chapter
Ill. To inhibit inadvertently triggered sweeps, remove the trigger signal from the EXT
TRlG IN connector, or disable triggered operation with the TOFF (Trigger OFF) HP-IB
command.
MARKER 1 Z-BLANK (PEN LIFT) I X-DRIVE OUTPUTS
The MARKER OUT, Z-BLANK OUT, and X-DRIVE OUT connectors provide outputs to
drive an analog plotter or oscilloscope display during sweep operation. Figure 1-30 il-
lustrates the use of MARKER OUT to drive an oscilloscope. Figure 1-31 illustrates the
oscilloscope connections used to obtain the display.