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Programming Reference
SCPI Instrument Command List
Command
:ROSC:SOUR
Long
[:SOURce]:ROSCillator:SOURce
Form
Set & Query
Parameter
INTernal | EXTernal
*RST value
INT
Description
Use this command to set/read the reference source for the PLL. If you
select the external reference (CLK IN connector) you can choose to use a
1 MHz, 2 MHz, 5 MHz or 10 MHz reference signal using
:ROSC:EXT:FREQ.
Example
:ROSC:SOUR EXT
Set external PLL reference (CLK IN)
:ROSC:EXT:FREQ 10 MHZ
Set expected PLL reference frequency
to 10 MHz
Command
:ROSC:EXT:FREQ
Long
[:SOURce]:ROSCillator:EXTernal:FREQuency
Form
Set & Query
Parameter
Numeric
*RST value
5 MHz
Specified limits
1 MHz, 2 MHz , 5 MHz or 10 MHz
Description
Use this command to set/read the expected reference frequency for the
PLL at the CLK IN connector. The external reference can be a 1, 2, 5 or 10
MHz signal. Note that if you program any value other than the specified
values, the value will be set to the nearest of the specified values.
Example
:ROSC:SOUR EXT
Set external PLL reference (CLK IN)
:ROSC:EXT:FREQ 10MHZ
Set expected PLL reference frequency to 10 MHz
INTernal Lock the PLL to its internal reference
EXTernal Lock the PLL to a reference signal at the CLK IN connector. The exter-
nal reference signal can be 1, 2, 5 or 10 MHz.