Aeroflex 3412 - Page 294

REMOTE OPERATION FM COMMANDS
4-84
[SOURce][:MODulation]:FM[1]|2:EXTernal:COUPling
Description: Selects AC or DC coupling for the external source.
Parameters: <CPD>
Valid values: AC | DC
*RST sets: AC
[SOURce][:MODulation]:FM[1]|2:EXTernal:COUPling?
Description: Queries whether the external source is AC- or DC-coupled.
Parameters: None
Response: <CRD>
Returned values: AC | DC
[SOURce][:MODulation]:FM[1]|2:EXTernal:DNULl
Description: Performs a DC FM null.
Reminder: you need to apply a ground reference to the external modulation input.
Parameters: None
[SOURce][:MODulation]:FM[1]|2:EXTernal:IMPedance
Description: Selects the impedance of the external source input — 50 Ω or 100 kΩ.
Parameters: <CPD>
Valid values: Z50 | K100
*RST sets: Z50 (in SCPI mode) or K100 (in 202x emulation).
[SOURce][:MODulation]:FM[1]|2:EXTernal:IMPedance?
Description: Queries the impedance of the external source input.
Parameters: None
Response: <CRD>
Returned values: Z50 | K100