148 Chapter 4
Basic Digital Operation
Triggering Waveforms
• To display the response selections available for a given trigger mode, press Trigger Setup, then select the
desired trigger mode. To see the selections for Single mode in an ARB format, select
Retrigger Mode; in
real-time Custom, selecting Single mode causes the data pattern to play once when triggered.
• To display the trigger source options, press
Trigger Setup > Trigger Source.
Setting the Polarity of an External Trigger
Gated Mode
The selections available with the gate active parameter refer to the low and high states of an external trigger
signal. For example, when you select High, the active state occurs during the high of the trigger signal.
ARB Formats When the active state occurs, the ESG stops the waveform file playback at the last
played sample point, and restarts the playback at the next sample point when the
inactive state occurs.
Real-Time Custom When the active state occurs, the ESG transmits the data pattern. When the inactive
state occurs, the transmission stops at the last transmitted symbol, and restarts at the
next symbol when the active state occurs.
Continuous, Single, or Segment Advance Modes
The
Ext Polarity Neg Pos softkey selections refer to the low (negative) and high (positive) states of an external
trigger. With Neg selected (the default), the ESG responds during the low state of the trigger signal.
Using Gated Triggering
Gated triggering enables you to define the on (playback) and off states of a modulating waveform. This
example uses the factory supplied segment, SINE_TEST_WFM.
1. Connect the output of a function generator to the signal generator’s rear-panel PATTERN TRIG IN, as
shown in the following figure.
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