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174 Chapter 6
Configuration - Screens and Control Fields
Ref Select Ref Select
Ref Select
This field selects the timebase reference signal to use for generating
and analyzing signals.
• Auto automatically selects an external reference if a signal of
sufficient level is detected at the EXT REF IN.
• Internal uses the Test Set’s internal timebase and ignores signals
connected to the EXT REF IN connector.
• External requires a valid reference signal to be connected to the
EXT REF IN connector.
Operating Considerations
The front-panel REFERNCE indicators show which source is selected
and whether or not the timebase is phase locked. The Test Set will not
operate correctly if it is unlocked.
Locking to an external reference may take several seconds. The lower
the frequency the longer it may take to lock to the signal.
Screen(s) Where Field is Present
INSTRUMENT CONFIGURE
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