User manual

AR2010 USB Stick Synthesizer User Manual
4. FREQuency:REFerence:EXTernal [ON|OFF|1|0]
This command allows the user to select between the internal 20 MHz reference and an externally sup-
plied reference. Note that when an external reference is applied, the appropriate reference frequency and
reference divider values must be set. When switching from an external reference to the internal reference,
the reference frequency value will automatically be set to 20 MHz.
When OFF or 0 is specified, the internal reference oscillator is used by the USB Stick Synthesizer.
When ON or 1 is specified, the external reference input is used by the USB Stick Synthesizer.
Syntax
ON|1
FREQ :REF :EXT Space
OFF|0
?
Example
FREQ:REF:EXT 0 This command selects the internal reference oscillator.
Default Condition
On power up, or when a *RST command is issued, the USB Stick Synthesizer defaults to the reference
oscillator state stored in the selected SYSTem:BOOTSTATE.
Query
FREQ:REF:EXT? This query returns a 0 or 1 to indicate the selected USB Stick Synthesizer reference
mode
∙ 0 is returned if the internal reference is selected
∙ 1 is returned if the external reference oscillator is selected
Applied Radar, Inc. Revision 2.0.1 21