Technical data

AR2010 USB Stick Synthesizer USB Programming Manual
3. FREQuency:REFerence:EXTernal [ON|OFF|1|0]
This command allows the user to select between the internal 10 MHz reference and an externally supplied
10 MHz reference.
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 SYST:PRES or *RST command is issued, the USB Stick Synthesizer defaults to
the reference oscillator state stored in memory location 0.
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 1.0.0 19