QM1004A-2-18 Combined RF Upconverter/Downconverter
User Manual
3.4 FREQuency:REFerence:EXTernal [1
|
0]
This command allows the user to select between the internal 100 MHz reference and an externally sup-
plied reference. Issuing this command overrides the back panel toggle switch setting.
When
0
is specified, the internal reference oscillator is used by the Combined RF Upconverter/Downcon-
verter.
When
1
is specified, the external reference input is used by the Combined RF Upconverter/Downcon-
verter.
Syntax
1
:
FREQ
:
REF
:
EXT
Space
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 QM1004A-2-18 returns to the boot state’s setting.
The Combined RF Upconverter/Downconverter default setting is 0.
Query
:FREQ:REF:EXT?
This query returns a 0 or 1 to indicate the selected Combined RF Upconverter/-
Downconverter reference mode
∙
0 is returned if the internal reference oscillator is selected
∙
1 is returned if the external reference is selected
Error Message
If the parameter is not in the recognized format, error
-102, "Syntax error"
occurs.
If the parameter is not 1 or 0, error
-222, "Data out of range"
occurs.
Quonset Microwave
Revision 1.4.3
42
