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How to Configure the Gain Properly on the NI PXIe-5672 RF Vector Signal Generator When Generating Data Recorded With NI-RFSA

Primary Software: Driver Software>>NI-RFSG
Primary Software Version: 1.3
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
After acquiring and saving unscaled data with NI-RFSA (1D I16), I do not generate the correct signal with the NI PXIe-5672 RF Vector Signal Generator. Why is this?

Solution:

When you record the data with the NI PXI-5661, the niRFSA Fetch IQ (1DI16).vi has a wfm info output that contains a scaling factor, gain. (see picture below).

You will need to store the gain to use in the generation example to properly scale the data. When regenerating the data, the power level of the NI PXIe-5672 needs to be set to 10 + 20* log (cluster scaling factor*32767) to regenerate the data at the same level at which it was recorded.

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Report Date: 08/22/2007
Last Updated: 12/28/2007
Document ID: 4CLG6TY5

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