Rohde & Schwarz SMU200A - Page 593

Remote Control Commands
R&S
®
SMU200A
573Operating Manual 1007.9845.32 ─ 15
[:SOURce<hw>]:AWGN:ENRatio <Enratio>
This command sets the ratio of bit energy to noise power density in "Additive Noise"
mode.
Depending on the selected reference mode either the noise level (AWGN:POW:RMOD
NOISe) or the carrier level (AWGN:POW:RMOD CARRier) is adjusted to the set E
b
/N
0
ratio.
●
"Reference Mode Carrier" (AWGN:POW:RMOD CARRier)
the noise level is adjusted to the set E
b
/N
0
ratio and the carrier level is kept constant.
●
"Reference Mode Noise" (AWGN:POW:RMOD NOISe)
the carrier level is adjusted to the set E
b
/N
0
ratio and the noise level is kept constant.
For Digital Standard signals, the bit rate used for calculation of E
b
/N
0
value from C/N
value can be entered with command SOUR:AWGN:BRAT.
For Custom Digital Mod signals the bit rate used for calculation of E
b
/N
0
value from C/
N value is determined by the selected standard (SOURce:BB:DM:STANdard) and can-
not be changed.
Parameters:
float
-30 to 30
0.001
0
dB
<Enratio>
Range:
Increment:
*RST:
Default unit:
AWGN:ENR 10
sets a ratio of bit energy to noise power density of 10 dB
Example:
[:SOURce<hw>]:AWGN:FREQuency:RESult?
This command queries the actual frequency of the sine in the CW Interferer mode.
The actual frequency may differ from the desired frequency, since the resolution is limited
to 0.7 Hz.
Return values:
float<Result>
AWGN:FREQ:RES?
queries the actual frequency of the interfering sine
Example:
Query onlyUsage:
[:SOURce<hw>]:AWGN:FREQuency:TARGet <Target>
This command sets the desired frequency of the sine in "CW Interferer" mode
(AWGN:MODE CW).
The resulting frequency may differ from the desired frequency because of the limited
frequency resolution of 0.7 Hz.
SOURce Subsystem