Choice: On | Off
Default: Off
Double-click or use the drop-down menu to enable or disable adding real-time, non-repeating additive white Gaussian noise (AWGN) to the carrier being modulated by the waveform being played.
– enables the addition Real-time Noise.
– disables the addition of Real-time Noise.
Range: -100 to 100 dB
Default: 0 dB
Enter the noise power to be applied to a waveform. The carrier power is defined as the total modulated signal power before noise power is added. When you add noise, the power output from the signal generator does not change; it is the sum of carrier power and the added noise power. A positive value makes C larger than N.
Range:
N5182A 1.0 Hz to 100 MHz
E4438C 1.0 Hz to 80 MHz
Default: 1.0 Hz
Specifies the bandwidth over which the noise power is integrated for calculating the carrier to noise ratio (the bandwidth of the target carrier). Also, the maximum upper range is limited to Base Sampling Rate x OSR before download is finished. When Carrier Bandwidth Auto is set to AUTO, this parameter is read only.
Choice: Manual | AUTO
Default: Manual
Sets whether the carrier bandwidth is automatically set by the software or set manually, using the Carrier Bandwidth parameter. When set to AUTO, the Carrier Bandwidth parameter is read only.
This parameter appears in the software's GUI only when Minor Enhancement Update (MEU) Option U03 or greater is valid. Refer to Licenses for more information.
Range: 1 to 2
Default: 1
Displays the flat noise bandwidth factor for the applied real-time noise.
When the Sample Clock is < 50 MHz, the Noise Bandwidth Factor adjusts the RF flat noise bandwidth to be either at least 0.8 times the sample rate for a bandwidth factor of 1, or 1.6 times the sample rate if the bandwidth factor is 2.
When the Sample Clock is > 50 MHz, noise cannot be enabled if the Noise Bandwidth Factor is 2. Any oversampling in a waveform will effectively make the noise bandwidth that many times wider than the signal bandwidth.
The Noise Bandwidth is calculated as follows:
The noise bandwidth is at least 0.8 * [ARB Sample Clock] * [Noise Bandwidth Factor]
This parameter is not available for all instrument model numbers and may be grayed out.
Range: 0.001 Hz to 100.000 MHz
Default: 1.000 Hz
Set or change the noise bandwidth.
This parameter is not available for all instrument model numbers and may be grayed out.
Choice: Carrier + Noise | Carrier | Noise
Default: Carrier + Noise
Double-click or use the drop-down menu to select the mode.
This parameter enables diagnostic control of additive noise, such that only the noise, only the carrier, or the sum of both the noise and the carrier are output from the internal baseband generator. With the ALC off, this feature enables direct measurement of just the carrier or the noise contributions to the total power. The system will still behave as if both the noise and the carrier are present on the output when it comes to determining the Auto Modulation Attenuation and the RMS level for RMS Power Search.