Specifies the method for performing the ACP measurement.

Syntax

Namespace: NationalInstruments.RFmx.NRMX

public enum RFmxNRMXAcpMeasurementMethod

Members

NameValueDescription
Normal0

The ACP measurement acquires the spectrum using the same signal analyzer setting across frequency bands. Use this method when measurement speed is desirable over higher dynamic range.

DynamicRange1

The ACP measurement acquires the spectrum using the hardware-specific optimizations for different frequency bands. Use this method to get the best dynamic range. Supported Devices: PXIe 5665/5668R.

SequentialFft2

The ACP measurement acquires I/Q samples for a duration specified by the ACP Sweep Time method. These samples are divided into smaller chunks. The size of each chunk is defined by the ACP Sequential FFT Size method, and the FFT is computed on each of these chunks. The resultant FFTs are averaged to get the spectrum and is used to compute the ACP. If the total acquired samples is not an integer multiple of the FFT size, the remaining samples at the end of the acquisition are not used for the measurement. Use this method to optimize ACP Measurement speed. The accuracy of results may be reduced when using this measurement method. For accurate power measurements when the power characteristics of the signal vary over time, averaging is allowed.
The following methods have limited support when you set the ACP Measurement Method to Sequential FFT.

  • The ACP RBW Auto method will only support True value.  

  • The ACP RBW Filter Type method will only support FFT Based value.  

  • The ACP Averaging Count method will only support a value greater than or equal to 1.  

  • The ACP Num Analysis Threads method will only support a value of 1.  

  • The ACP Amplitude Correction Type Method will only support a value of RF Center Frequency.  

Note

For multi-span FFT, the averaging count should be 1.