Aggressive rounding when exporting a measurement

matthew935

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Jun 27, 2021
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I just updated to REW v5.20.2 today (I was probably a number of releases behind), and I noticed that the amplitude column is now exported with very coarse rounding (when using the "Export measurement as text" option).

The Y axis values are rounded to the nearest 0.1dB. This was not the case in the version of REW I was using previously (can't remember the version number), so it must be a relatively recent change.

Here are the first few lines of a frequency response file (exported from an older version of REW) vs. the same data re-exported from the current version of REW:

Original:
Code:
20.000    3.888
20.145    3.893
20.291    3.901
20.438    3.919
20.586    3.938
20.735    3.957
20.885    3.974
21.037    3.989
21.189    4.002
21.343    4.012

Exported from the current version of REW:
Code:
20.000000    3.9
20.144928    3.9
20.290907    3.9
20.437943    3.9
20.586044    3.9
20.735220    4.0
20.885475    4.0
21.036819    4.0
21.189260    4.0
21.342806    4.0

This makes exported measurements have a noticeable stairstep effect. Here's a zoomed-in part of a frequency response graph (in blue) compared to itself after exporting and re-importing (in red):
sh2lEwt.png

I hope this can be fixed soon.
 
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