Agilent X-Series Signal Generators SCPI Command Reference 291
Arb Commands
Dual ARB Subsystem–N5172B/82B ([:SOURce]:RADio:ARB)
is derived from the symbol rate and bits per symbol of the modulation. The carrier bit rate is a saved
instrument state that is recorded in the waveform header.
The query returns the current carrier bit rate setting.
Example
:RAD:ARB:NOIS:CBR 5
The preceding example sets the carrier bit rate to 5 bps.
Default 1.000 bps
Range 1 bps to 999 Mbps
Key Entry Carrier Bit Rate
:NOISe:CBWidth
Supported N5172B/82B with Option 403
[:SOURce]:RADio:ARB:NOISe:CBWidth <value><unit>
[:SOURce]:RADio:ARB:NOISe:CBWidth?
This command selects the carrier bandwidth over which the additive white gaussian noise (AWGN) is
applied. The carrier RMS power and the noise power will be integrated over the selected
carrier–bandwidth for the purposes of calculating carrier to noise ratio (C/N). The minimum
increment value is 0.001 Hz. For more information, refer to the “:NOISe[:STATe]” command and the
“:NOISe:BANDwidth”command.
*RST +1.00000000E+000
Range 1 Hz to 200 MHz
Key Entry Carrier Bandwidth
:NOISe:CN
Supported N5172B/82B with Option 403
[:SOURce]:RADio:ARB:NOISe:CN <value><unit>
[:SOURce]:RADio:ARB:NOISe:CN?
This command sets the carrier to noise ratio (C/N) in dB. The carrier power is defined as the total
modulated signal power without noise power added. The noise power is applied over the specified
bandwidth of the carrier signal. For more information, refer to “:NOISe:CBWidth” on page 291.
Example
:RAD:ARB:NOIS:CN 50DB
The preceding example sets the carrier to noise ratio to 50 dB.
*RST +0.00000000E+000
Range –100 to 100 dB
Key Entry Carrier to Noise Ratio
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