Specifies the method for performing the ACP measurement.

You do not need to use a selector string to configure or read this property for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals.

The default value is Normal.

Remarks

The following table lists the characteristics of this property.

Short Name ACP Meas Method
Data type ci32.png
Permissions Read/Write
High-level VIs RFmxCDMA2k ACP Configure Measurement Method
Resettable Yes
Normal 0

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.

Dynamic Range 1

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.
Sequential FFT 2

The ACP measurement acquires I/Q the samples specified by the ACP Sweep Time. These samples are divided into smaller chunks. The size of each chunk is defined by the ACP Sequential FFT Size property, and FFT is computed for each these chunks. The resultant FFTs are averaged to get the spectrum 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. Use this method to optimize the 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 properties have limited support when you set the ACP Measurement Method property to Sequential FFT.

Properties Supported Values
ACP RBW Auto True
ACP RBW Filter Type FFT Based
ACP Averaging Count >=1
ACP Num Analysis Threads 1
Note For multi-span FFT, the averaging count should be 1.