RFmxPulseMX.AutoLevel Method
- Updated2024-07-17
- 2 minute(s) read
RFmxPulseMXAutoLevel Method
Examines the input signal to calculate the peak power level and sets it as the value of the ReferenceLevel method. Use this method to help calculate an approximate setting for the reference level.
The RFmxPulse Auto Level method does the following:
When using PXIe-5663, 5665, or 5668R devices, NI recommends that you set an appropriate value for mechanical attenuation before calling the RFmx Pulse Auto Level method. Setting an appropriate value for mechanical attenuation reduces the number of times the attenuator settings are changed by this method, thus reducing wear and tear, and maximizing the life time of the attenuator.
The RFmxPulse Auto Level method does the following:
- Resets the mixer level, mixer level offset and IF output power offset.
- Sets the starting reference level to the maximum reference level supported by the device based on the current RF attenuation, mechanical attenuation and preamp enabled settings.
- Iterates to adjust the reference level based on the input signal peak power.
- Uses immediate triggering and restores the trigger settings back to user setting after completing execution.
When using PXIe-5663, 5665, or 5668R devices, NI recommends that you set an appropriate value for mechanical attenuation before calling the RFmx Pulse Auto Level method. Setting an appropriate value for mechanical attenuation reduces the number of times the attenuator settings are changed by this method, thus reducing wear and tear, and maximizing the life time of the attenuator.
Namespace: NationalInstruments.RFmx.PulseMX
Assembly: NationalInstruments.RFmx.PulseMX.Fx40 (in NationalInstruments.RFmx.PulseMX.Fx40.dll) Version: 24.5.0.49283 (24.5.0.49283)
Syntax
public int AutoLevel( string selectorString, double bandwidth, double measurementInterval, out double referenceLevel )
Public Function AutoLevel ( selectorString As String, bandwidth As Double, measurementInterval As Double, <OutAttribute> ByRef referenceLevel As Double ) As Integer
Parameters
- selectorString
- Type: SystemString
Pass an empty string. The signal name that is passed when creating the signal configuration is used. - bandwidth
- Type: SystemDouble
Specifies the bandwidth, in Hz, of the signal to be analyzed. - measurementInterval
- Type: SystemDouble
Specifies the acquisition length. Use this value to compute the number of samples to acquire from the signal analyzer. This value is expressed in seconds. Auto Level method does not use any trigger for acquisition. It ignores the user-configured trigger methods. NI recommends that you set a sufficiently high measurement interval to ensure that the acquired waveform is at least as long as one period of the signal. - referenceLevel
- Type: SystemDouble
Upon return, contains the estimated peak power level of the input signal. This value is expressed in dBm for RF devices and as Vpk-pk for baseband devices.
Return Value
Type: Int32Returns the status code of this method. The status code either indicates success or describes a warning condition.