88
Agilent X-Series Signal Generators SCPI Command Reference
Basic Function Commands
Vector Modulation Subsystem—N5172B/82B ([:SOURce]:IQ)
In the other control modes, this will adjust the total power once for the specified signal power level,
after which the signal power could change if any noise parameters are adjusted.
The range varies based on the bounds of the total power that results from the noise settings.
Range
Varies based on the bounds of the total power that results from the noise settings
Key Entry
Signal Power
:OUTPut:IMPairments:AWGN:SBRate
Supported
N5172B with Option 653 or 655, N5182B with Option 656 or 657
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SBRate <value>
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SBRate?
This value adjusts the signal bit rate (gross bit rate) for purposes of calculating the Eb/No (energy
per bit over noise power density at the receiver). Adjusting this parameter will have an immediate
impact on the SNR as appropriate for the last specified Eb/No. The signal bit rate is a saved
instrument state that is recorded in the waveform header for Arb waveforms.
This value is only used if [:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNRFormat is EBNO and the
application currently on does not define a reference channel for Eb/No.
Range
1 bps to 999 Mbps
Key Entry
Reference Signal Bit Rate
:OUTPut:IMPairments:AWGN:SNR
Supported
N5172B with Option 653 or 655, N5182B with Option 656 or 657
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNR <value>
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNR?
This command sets the Signal to Noise Ratio (SNR). This is the value of the noise power as a ratio
of signal power to noise power. Signal power equals the total modulated signal power before noise is
added. When noise is added, the power output from the signal generator may not change; it is the
sum of signal power and the added noise power. This value can be changed in real time while the
waveform is playing.
*RST
0 dB
Range
- 100 dB to 100 dB
Key Entry
Signal to Noise Ratio
:OUTPut:IMPairments:AWGN:SNRFormat
Supported
N5172B with Option 653 or 655, N5182B with Option 656 or 657
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNRFormat SNR|EBNO
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNRFormat?
This command sets the variable controlling the ratio of signal power to noise power in the noise
integration bandwidth.