Chapter 7 247
Digital Signal Interface Module
Operating the N5102A Module in Input Mode
• clock skew adjustment
• clock polarity selection
2. Press the
Clock Source softkey.
From this menu, select the clock signal source. With each selection, the clock routing display in the
signal generator clock setup menu will change to reflect the current clock source. This will be indicated
by a change in the graphic.
3. Select the clock source.
If External or Device is Selected
Press the
Clock Rate softkey and enter the clock rate of the externally applied clock signal.
NOTE The clock phase and clock skew may need to be adjusted any time the clock rate setting is
changed. Refer to “Clock Timing for Phase and Skew Adjustments” on page 228.
For the
External selection, the signal is supplied by an external clock source and applied to the Ext Clock
In connector. For the
Device selection, the clock signal is supplied through the Device Interface
connector, generally by the device being tested.
If Internal is Selected
Using an external frequency reference, the N5102A module generates its own internal clock signal. The
reference frequency signal must be applied to the Freq Ref connector on the digital module.
a. Press the
Reference Frequency softkey and enter the frequency of the externally applied frequency
reference.
b. Press the
Clock Rate softkey and enter the appropriate clock rate.
Table 7-9 provides a quick view of the settings and connections associated with each clock source
selection.
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