NI-RFSG Playback Library 20.0 Known Issues


This document contains the NI-RFSG Playback Library 20.0 known issues that were discovered before and since the release of NI-RFSG Playback Library 20.0. Known issues are performance issues or technical bugs that NI has acknowledged exist within this version of the product.


Not every issue known to NI appears on this list; it is intended to show the most severe and common issues that you may encounter and provide workarounds when possible. Other technical issues that you may encounter could occur through normal product use or system compatibility issues. You may find more information on these issues in NI’s Product Documentation, Knowledgebase, or Community.

Bug Number

Legacy ID




Loss of precision in sampling rate when complex waveforms are passed as parameters to .NET APIs

Conversion of sampling interval (dt) from double to PrecisionTimeSpan parameter causes slight loss in resolution of the data.

This leads to precision error when sample rate is calculated as the inverse of the sampling interval obtained from PrecisionTimeSpan parameter.
Impacted APIs: DownloadUserWavform and ReadWaveformFromFile


Calculate the actual sample rate as “1/dt” and overwrite the sample rate using the StoreWaveformSampleRate API.

Reported Version:

NI-RFSG Playback Library 19.0

Resolved Version:



Jun 2, 2020

Final Time Issue Listed

Issues found in this section will not be listed in future known issues documents for this product.

There are currently no issues to list.

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Glossary of Terms


  • Bug ID - When an issue is reported to NI, you may be given this ID or find it on  You may also find IDs posted by NI on the discussion forums or in KnowledgeBase articles.
  • Legacy ID – An older issue ID that refers to the same issue.  You may instead find this issue ID in older known issues documents.
  • Description - A few sentences which describe the problem. The brief description given does not necessarily describe the problem in full detail.
  • Workaround - Possible ways to work around the problem.
  • Reported Version - The earliest version in which the issue was reported.
  • Resolved Version - Version in which the issue was resolved or was no longer applicable. "N/A" indicates that the issue has not been resolved.
  • Date Added - The date the issue was added to the document (not the reported date).