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106 Chapter 3
Basic Digital Operation
Triggering Waveforms
3. Configure the carrier signal output:
• Set the desired frequency.
• Set the desired amplitude.
• Turn on the RF output.
4. Select a waveform for playback (sequence or segment):
a. Preset the signal generator.
b. Press
Mode > Dual ARB > Select Waveform.
c. Highlight a waveform file (for this example, SINE_TEST_WFM).
d. Press
Select Waveform.
5. Select the waveform trigger method:
a. Press Trigger > Gated.
b. Press
Trigger > Trigger Setup and note that for the Gate Active Low High softkey, the default selection is
High, which is the selection used in this example.
6. Select the trigger source and rear panel input:
a. For the
Trigger Sou rce softkey, the default selection is Ext, which is the selection used in this
example (gated triggering requires an external trigger).
b. Press
Trigger Source and note that for the Ext Source softkey, the default selection is Patt Trig In 1,
which is the selection used in this example.
7. Generate the waveform:
Press
ARB Off On to On.
8. On the function generator, configure a TTL signal for the external gating trigger.
9. (Optional) Monitor the current waveform:
Configure the oscilloscope to display both the output of the signal generator, and the external
triggering signal. You will see the waveform modulating the output during the gate inactive
periods (low).
The following figure shows an example display.