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248 Agilent X-Series Signal Generators SCPI Command Reference

Arb Commands

Dmodulation Subsystem–N5172B/82B with Option 431 ([:SOURce]:RADio:DMODulation:ARB)

Dmodulation Subsystem–N5172B/82B with Option 431

([:SOURce]:RADio:DMODulation:ARB)

:BASeband:FREQuency:OFFSet

Supported N5172B/82B with Option 431

[:SOURce]:RADio:DMODulation:ARB:BASeband:FREQuency:OFFSet <value><unit>

[:SOURce]:RADio:DMODulation:ARB:BASeband:FREQuency:OFFSet?

This command offsets the baseband frequency relative to the carrier. The feature is useful for moving

the signal such that the carrier feed–through is not in the center.

The X- Series signal generator provides automatic DAC over–range protection when the offset value is

something other than 0 Hz. It scales down the playing I/Q data by 1/square root of 2.

*RST +0.00000000E+000

Range +5.0E7 to –5.0E7 Hz

:BASeband:FREQuency:OFFSet:PHASe:RESet

Supported N5172B/82B with Option 431

[:SOURce]:RADio:DMODulation:ARB:BASeband:FREQuency:OFFSet:PHASe:RESet

This command clears the phase accumulation and so zero phase shift.

When the Baseband Frequency Offset is non–zero, the hardware rotator accumulates phase–shift of

the baseband signal. This residual phase remains even after the offset value is returned to zero.

While there is a non–zero residual phase present in the signal, the DAC Over–Range Protection

feature will automatically prevent DAC overrange errors from occurring by scaling the signal down by

1/square root of 2.

:FILTer

Supported N5172B/82B with Option 431

[:SOURce]:RADio:DMODulation:ARB:FILTer RNYQuist|NYQuist|GAUSsian|

[:SOURce]:RADio:DMODulation:ARB:FILTer?

This command specifies the pre–modulation filter type.

RNYQuist This choice selects a Root Nyquist (root raised cosine) filter. This filter is adjusted

using Alpha.

NYQuist This choice selects a Nyquist (raised cosine) filter. This filter is adjusted using

Alpha.

GAUSsian This choice selects a Gaussian filter which is adjusted using Bbt values.

RECTangle This choice selects a one symbol wide rectangular filter.

Key Entry Baseband Frequency Offse

Key Entry Baseband Frequency Offset Phase Reset

Agilent Technologies N5171B User Manual

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