To open the instrument node, click in the tree view.
The figure below shows the Instrument node for a signal generator connection. Click a button or click an item in the Instrument Controls list for information on that button or item.
Click this button to turn on the fader if the instrument is connected. At the same time, all setting changes will be sent to the instrument immediately. For SCPI command, see Fader Thr.
Click this button to turn off the fader if the instrument is connected. If the fader is turned off, all the local settings and changes will be saved and sent to the instrument when the fader is turn on or through. For SCPI command, see Fader Thr.
Click this button to turn the fader through. Then the signal will pass through the fader without applying any fading.
[:SOURce]:FSIMulator[1]:FADer[1]:MODE ON|OFF|THR
[:SOURce]:FSIMulator[1]:FADer[1]:MODE?
Click the button to retrieve the parameters from the connected instrument.
Click the button to set the signal generator to a factory-defined or user-defined state.
Refer to the signal generator's user's guide for information on setting a user-defined state.
Click the button to execute an I/Q DC calibration to minimize errors associated with offset voltages.
minimizes I/Q offset errors for a single frequency only and must be repeated if the signal generator's settings change.
Download a waveform to set the correct parameters for the target instrument and activate this button.
You can set this calibration to occur automatically. See 1. Configuration.
Click the button to execute a manual power search calibration. This is an internal calibration routine that improves output power accuracy when the ALC is turned off. A power search is recommended for pulse-modulated signals with pulse-widths less than two microseconds.
Download a waveform to set the correct parameters for the target instrument.
This parameter displays the model number of the connected instrument.The detailed instrument model number appears here after you run the System Configuration Wizard.
Range: for frequency range values, see the signal generator's data sheet
Enter a value to set the signal generator’s output frequency. Use abbreviations for faster entry (example: 1g = 1.000000000000 GHz). Note that this setting is coupled with the Carrier Frequency setting under the Fading node. If you change the Frequency value, the Doppler Frequency or the Vehicle Speed settings under the Fader Path node will be changed.
Range: for amplitude range values, see the signal generator's data sheet
Enter a value to set the signal generator’s output amplitude in dBm.
Choice: Off | On
Default: On
Double-click or use the drop-down menu to turn the signal generator’s RF output or .
This property table contains all the parameters for configuring real-time AWGN in the connected instrument. SCPI commands for these parameters are found in the instrument's documentation set.
The SCPI command syntax for a given real-time AWGN parameter varies according to the embedded application being used. For example, notice the difference in the commands controlling the AWGN state for the following two applications:
ARB Custom Modulation
[:SOURce]:RADio:DMODulation:ARB:NOISe[:STATe] ON|OFF|1|0
Dual ARB
[:SOURce]:RADio:ARB:NOISe[:STATe] ON|OFF|1|0
Choice: On | Off
Default: On
Turns on or off the real-time AWGN.
Choice: Total | Carrier | Total Noise | Channel Noise
Default: Total
Offers four ways to control RF output power when adding AWGN to a signal.
Total: This is the default mode where the total power and C/N are independent variables and the carrier power, channel noise power, and total noise power are dependent variables set by the total power, C/N and the rest of the noise settings. The carrier power, channel noise power, and total noise power will change as any noise parameter is adjusted to keep the total power and the C/N at their last specified values.
Carrier: In this mode the carrier power and C/N are independent variables and the total power, channel noise power, and total noise power are dependent variables set by the carrier power, C/N and the rest of the noise settings. The total power, channel noise power, and total noise power will change as any noise parameter is adjusted to keep the carrier power and the C/N at their last specified values.
Total Noise: In this mode the total noise power and C/N are independent variables and the total power, channel noise power, and carrier power are dependent variables set by the total noise power, C/N and the rest of the noise settings. The total power, channel noise power, and carrier power will change as any noise parameter is adjusted to keep the total noise power and the C/N at their last specified values.
Channel Noise: The channel noise power and C/N are independent variables and the total power, total noise power, and carrier power are dependent variables set by the channel noise power, SNR and the rest of the noise settings. The total power, total noise power, and carrier power will change as any noise parameter is adjusted to keep the channel noise power and the SNR at their last specified values.
Choice: C/N | Eb/No
Default: C/N
Selects either the Carrier to Noise Ratio (C/N) or energy per bit over noise power density at the receiver (Eb/No) as the variable controlling the ratio of carrier power to noise power in the carrier bandwidth.
Range: -100 dB to 100 dB
Default: 0.0 dB
Allows the C/N to be set using the Eb/No (energy per bit over noise power density at the receiver) form. This parameter is active only when the Carrier to Noise Ratio Format is set to Eb/No, otherwise it is read-only.
Range: -100 dB to 100 dB
Default: 0.0 dB
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. This parameter is active only when the Carrier to Noise Ratio Format is set to C/N, otherwise it is read-only.
Range: The range varies based on the bounds of the total power that results from the noise settings.
Default: The appropriate value given the current total power and the current Carrier to Noise (C/N).
Sets the current carrier power level. This parameter is active only when the Power Control is set to Carrier, otherwise it is read-only.
Range: The range varies based on the bounds of the total power that results from the noise settings.
Default: The appropriate value given the current total power and the current Carrier to Noise (C/N).
Sets the current total noise power level. This parameter is active only when the Power Control is set to Total Noise, otherwise it is read-only.
Range: The range varies based on the bounds of the total power that results from the noise settings.
Default: The appropriate value given the current total power and the current Carrier to Noise (C/N).
Sets the current channel noise power level. This parameter is active only when the Power Control is set to Channel Noise, otherwise it is read-only.
Range: 1 Hz to 200 MHz
Default: 1.000 Hz
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.
The value affects the limits of Eb/No, if it is active. When the Dual ARB is on, this value is coupled to the Sample Clock Rate when the Arb modulation filter is enabled. When the ARB Customer Modulation or Real-Time Customer Modulation is on, this value is controlled by the Symbol Rate in single carrier mode.
Range: 1 Hz to 200 MHz
Default: 1.000 Hz
Selects the flat noise bandwidth value of the real–time. Typically, this value is set slightly wider than the signal bandwidth. The minimum increment value is 0.001 Hz.
Range: 1 bps to 999 Mbps
Default: 1.000 bps
Sets a value of the carrier bit rate (gross bit rate) for purposes of calculating the Eb/No (energy per bit over noise power density at the receiver).
This parameter is active only when the Carrier to Noise Ratio Format is set to Eb/No, otherwise it is read-only.The adjustment of the carrier bit rate will have an immediate impact on the carrier to noise ratio as specified by Eb/No. The carrier bit rate is derived from the symbol rate and bits per symbol of the modulation.
Choice: Sum | Carrier | Noise
Default: Sum
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.