Frequency Reference Source - Keysight N9913A User Manual

System Settings
System Configuration
Saving Data with GPS Enabled
GPS position and clock data are included when data is saved with the following
files types: *.csv, *.SnP, State, State+Trace data save.
A warning is shown if the GPS is ON but unlocked at time of save, or if the GPS
feature is ON but no GPS is physically present at time of save.
The following is a sample S1P file with GPS information:
!GPS Latitude: 38 28.87717 N
!GPS Longitude: 122 42.66625 W
!GPS TimeStamp: 06/25/2010 16:24:48
!GPS Seconds Since Last Read: 2s

Frequency Reference Source

The FieldFox internal frequency reference source is used to make accurate and
stable measurements. To improve measurement accuracy and stability, you
can use a highly-stable external 10 MHz reference source or a precision timing
signal provided with Built-in GPS (Opt. 307).
The Frequency Reference setting will survive a Factory Preset or Mode Preset
and is saved as part of the Instrument State. When resuming after Standby, the
FieldFox will display an Unlock message while it acquires a lock to an external
or GPS source.
How to select Frequency Reference Source
— Press System 7
— Then
— Then
— Then
— Then choose from the following:
492
System Configuration
Frequency Ref
Freq Ref Source
— Int Internal frequency reference
— Ext External frequency reference. Connect the 10 MHz External
Reference to the Ref In/Trig In SMA (f) connector on the FieldFox top
panel. The FieldFox may take up to 10 seconds to lock to a valid
External Reference source
— GPS Available ONLY with Built-in GPS (Opt. 307). When selected, the
internal GPS is immediately enabled and a search for satellites
begins. When satellites are found, the precision timing signal is NOT
used directly, but is used to correct the absolute frequency of the
internal reference many times per second.
Keysight N9927-90001 User's Guide