Agilent X-Series Signal Generators SCPI Command Reference 355
Digital Signal Interface Module Commands
Digital Subsystem—Option 003 and 004 ([:SOURce])
:DIGital:DATA:INPut:NOISe:BANDwidth
Supported N5172B/82B with option 004
:DIGital:DATA:INPut:NOISe:BANDwidth <value><unit>
:DIGital:DATA:INPut:NOISe:BANDwidth?
This command selects the flat noise bandwidth value of the real–time noise for an ARB
waveform. Typically, this value is set slightly wider than the signal bandwidth. The minimum
increment value is 0.001 Hz.
Example
:DIG:DATA:INP:NOIS:BAND 8MHZ
The preceding example sets the flat noise bandwidth to 8 MHz.
*RST +1.00000000E+000
Range 1 Hz to 160 MHz (depends on the installed baseband generator option)
Key Entry Flat Noise Bandwidth
:DIGital:DATA:INPut:NOISe:CBRate
Supported N5172B/82B with option 004
:DIGital:DATA:INPut:NOISe:CBRate <1bps - 999Mbps>
:DIGital:DATA:INPut:NOISe:CBRate?
This command sets a value of the carrier bit rate (gross bit rate) for purposes of calculating the
E
b
/N
0
(energy per bit over noise power density at the receiver). When the carrier to noise ratio
format is set to E
b
/N
0
(refer to the :DIGital:DATA:INPut:NOISe:CNFormat command), the adjustment
of the carrier bit rate will have an immediate impact on the carrier to noise ratio as specified by
E
b
/N
0
. The carrier bit rate 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
:DIG:DATA:INP: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
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