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16 User’s and Service Guide Supplement

E4438C Option HEC

Repeatable Triggering for Multiple Baseband Sources

3. Select ARB Setup > More (1 of 3) > More (2 of 3) > VCO CLOCK Ext > [Return] ARB

“On.” Refer to Figure 11.

4. Adjust the trigger level control on the oscilloscope for a stable display.

5. Align the DACs:

[Mode] Dual ARB > ARB Setup > More (1 of 3) > More (2 of 3) > Align DAC

NOTE

Changing or disrupting the external clock frequency can cause the DACs to

become misaligned. Press the align DACs softkey after changing the clock

frequency.

Figure 11 I & Q Output for the “Master” Instrument

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 33 34

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Agilent Technologies E4438C Guida Utente Pagina 24