Keysight N9923A, Руководство пользователя, Страница: 226 / 276

226 Keysight N9923-90001 User’s Guide
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.
The External 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 use an External Reference
Connect the 10 MHz External Reference to the
EXT TRIG/EXT REF
BNC
connector on the FieldFox top panel. External Triggering is NOT available on
the N9923A.
— Press
System 7
— Then
System Configuration
— Then Frequency Ref
— Then
Freq Ref Source Int Ext
When switched to Ext, if the FieldFox does NOT find an appropriate signal with
which it can lock, then
Ext Ref UNLOCKED is displayed in the lower-left corner
of the screen. This can occur when any of the following conditions exist:
— NO external reference signal is present.
— A low-level external reference signal is present.
— A very high-level external reference signal is present.
The FieldFox may take up to 10 seconds to lock to a valid External
Reference source.