Agilent Technologies FieldFox N9912A User Manual page 150

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External Frequency Reference
The FieldFox can phase lock with an external 10 MHz reference signal. When a
high-stability 10 MHz reference signal is available, this can improve the accuracy
and stability of measurements in CAT, NA, and SA Modes.
The External Reference setting will survive a FieldFox or Mode Preset and is
saved as part of the Instrument State.
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. Learn about External Trigger Input on
page 76.
 Press System 7
 Then
 Then
 Then
NOTE The FieldFox may take up to 10 seconds to lock to a valid External Reference
source.
When switched to Ext, if the FieldFox does NOT find an appropriate signal with
which it can lock, then
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 external reference is off-frequency.
For best results, the signal should be between –5 dBm and +5 dBm.
Date and Time, Format, and Time Zone Settings
Set the local date and time, Date and Time format, and Time Zone that is shown
on the FieldFox screen. The Date and Time is also used to identify files that are
saved.
If it is NOT saved with Preferences, then it is reset when the FieldFox is powered
OFF and ON.
The Date and Time can also be set by synchronizing with GPS satellites. Learn
more on page 148.
How to set Date and Time, Date and Time Format, and Time Zone
 Press System 7 .
 Then
 Then
 Press the ▲|▼ arrows to highlight the row to be edited.
150
System Configuration
Frequency Ref
Freq Ref Source Int Ext
Ext Ref UNLOCKED
System Configuration.
Date and Time.
is displayed in the lower-left corner
N9912A FieldFox User's Guide