What's the unit label of y-axis of PSD when using Spectral Measurement Express VI?

Hi:
 What's the unit label of y-axis of PSD when using Spectral Measurement Express VI?
Selected Measurement : Power spectral density
Result : dB
No Averaging..
Is dB/Hz the magnitude label of PSD output? Thx!

There could be an issue the the Express VI converting your waveform data into the dreaded Dynamic Data Type, which is just causing more and more memory to be used.
So what I would recommend is use the DAQmx Configure Logging  VI to configure DAQmx to stream the data as you read straight to a TDMS file.  There are various other properties you can set to make the logging go across files.  You just set up the logging before running your task.
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