Frequency Reference Source; Security Level - Keysight N9912A User Manual

Frequency Reference Source

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 set 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 85.
 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
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.

Security Level

For security reasons, you can prevent frequency information from appearing on the
FieldFox while in SA, NA, or CAT modes.
How to set Security Level
 Press System 7
 Then
 Then
 Then choose from the following:
180
System Configuration
Frequency Ref
Freq Ref Source Int Ext
Ext Ref UNLOCKED
System Configuration
Security Level
All frequency settings are visible.
None
o
Frequency information is blanked from the following:
High
o
Display annotation
o
Softkeys
o
Marker display and marker table
o
Calibration properties
o
All settings tables
o
Limit line tables
o
is displayed in the lower-left corner of the
FieldFox User's Guide