Selecting a Frequency/Timing Reference

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Perform this procedure to select a common frequency or timing reference to be used for all measurement tools (when applicable).

	Step	Notes
1	[System]
2	[Fr/Time Ref Location]
3	[Fr/Time Ref]	Displays additional menu buttons. With Internal GPS and External Even Sec, both frequency and time references are active. This is used when measuring CDMA signals to get valid PN offsets. With the other five options, you get only frequency.
4	Select the frequency/timing reference you want.

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NOTE:

A frequency/time reference indicator in the lower-right of the screen shows both the selected reference and its status. Reference indicators include: "GPS," "Int Ref," "Even Sec," "Ext 10 MHz," "Ext 13 MHz," or "Ext 19.66 MHz." Status indicators include:

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• Green dot to indicate that the reference is locked
• Yellow triangle to indicate that the reference is acquiring lock
• Red X to indicate that the reference is not locked