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10 Chapter 2

E4428C/38C SCPI Commands

Digital Modulation Subsystem (:SOURce)

:DM:EXTernal:ALC:BANDwidth|BWIDth

Supported E4438C

[:SOURce]:DM:EXTernal:ALC:BANDwidth|BWIDth NORMal|NARRow

[:SOURce]:DM:EXTernal:ALC:BANDwidth|BWIDth?

This command sets the bandwidth of the automatic leveling control (ALC) loop. Use this command when

the ALC is set to On. Refer to the “:ALC[:STATe]” command for selecting the mode.

NORMal This choice enables the signal generator to automatically select the ALC bandwidth for

the current test conditions.

NARRow This choice sets the narrowest possible ALC bandwidth and is useful when an external

I/Q source is connected.

*RST NORM

Key Entry

ALC BW Normal Narrow

Remarks This command is no longer supported and has been replaced by:

[:SOURce]:POWer:ALD:BANDwidth|BWIDth 100HZ|1KHZ|10KHZ and the

[:SOURce]:POWer:ALD:BANDwidth|BWIDth:AUTO ON|OFF|1|0 commands.

The NORMal parameter is replace by the AUTO parameter in the new command. The NARRow

parameter is replaced by the 100HZ parameter in the new command.

:DM:IQADjustment:SKEW

Supported All

[:SOURce]:DM:IQADjustment:SKEW <val><unit>

[:SOURce]:DM:IQADjustment:SKEW?

This command changes the input skew to the I and Q paths. Equal and opposite skew is applied to both paths

(RF Output path and I/Q output paths) simultaneously. A positive value delays the I signal relative to the Q

signal, and a negative value delays the Q signal relative to the I signal.

If the internal I/Q correction path is set to RF or BB the I/Q signals are already optimized and adjusting I/Q

skew would add an impairment to the signals. If the internal I/Q correction path is set to Off, then adjusting

the I/Q skew could improve the I/Q signals. The I/Q skew adjustment cannot be performed on the MSK,

FSK, and C4FM constant envelope modulations.

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Agilent Technologies ESG Manuale Utente Pagina 18