topic Resampled Waveform Time Delta in LabVIEW Electrical Power Toolkit

Resampled Waveform Time Delta

mbremer — Wed, 13 Mar 2019 21:17:39 GMT

Hi,

I have a seemingly pretty basic question about the data that the electrical power toolkit deals with. In the example FPGA code the sampled data is re-sampled to convert to constant-angle data. In the RT code this data is then converted into a waveform (Convert Data to Waveforms VI). Since a waveform only stores start timestamp, time delta, and data array, does this mean data is converted back into constant time data? If I read data out of the FPGA in a loop and the frequency drifts will the dt of the waveform change?

Re: Resampled Waveform Time Delta

Yifan.Liu — Thu, 14 Mar 2019 06:53:33 GMT

I assume you are looking at the PQ examples.

The resampled data is still constant-angle data, although the data is represented in waveform type with a dt. We do this because we assume the frequency will not change during one data block (~200ms).

If the frequency drifts from block to block, the dt of the resampled waveform will change.

Re: Resampled Waveform Time Delta

mbremer — Thu, 14 Mar 2019 14:35:38 GMT

Thanks for the clarification. Do I need any special consideration for logging blocks to TDMS if the dt value could change?